TWI878540B - Optical laminate - Google Patents

Abstract

Translated fromChinese

光學積層體往厚度方向一側依序具備第1薄膜、第1接著劑層、玻璃板、第2接著劑層及第2薄膜。厚度方向一側係視辨側。在下述落筆破裂試驗中，直至玻璃板開始破裂為止之筆的落下高度H1為20cm以上。＜落筆破裂試驗＞將在25℃下之剪切儲存彈性模數G'為0.03MPa且厚度為15µm之黏著劑層配置於第1薄膜之厚度方向另一面，前述在25℃下之剪切儲存彈性模數G'係藉由頻率1Hz、升溫速度5℃/分鐘、溫度-40℃~150℃、扭轉模式之動態黏彈性試驗求算。使10g之筆朝第2薄膜落下。將筆之落下高度每次提高1cm且提高至30cm為止，並取得確認玻璃板有破裂時之高度作為落筆破裂試驗中之高度H1。或者，在筆之落下高度30cm未確認玻璃板有破裂時，判斷為具有30cm以上之抗剝落耐久性。The optical laminate has a first film, a first adhesive layer, a glass plate, a second adhesive layer and a second film in order on one side in the thickness direction. The side in the thickness direction is the visual side. In the following pen-drop crack test, the drop height H1 of the pen until the glass plate begins to crack is more than 20 cm. <Pen-drop crack test> An adhesive layer with a shear storage modulus G' of 0.03 MPa at 25°C and a thickness of 15µm is arranged on the other side of the first film in the thickness direction. The above-mentioned shear storage modulus G' at 25°C is calculated by a dynamic viscoelastic test with a frequency of 1 Hz, a heating rate of 5°C/min, a temperature of -40°C~150°C, and a torsional mode. A 10g pen is dropped toward the second film. The height of the pen drop is increased by 1 cm each time until it reaches 30 cm, and the height at which the glass plate is confirmed to be broken is taken as the height H1 in the pen drop breakage test. Alternatively, if the glass plate is not confirmed to be broken at a height of 30 cm, it is judged to have an anti-peeling durability of more than 30 cm.

Description

Translated fromChinese

光學積層體Optical laminate

本發明涉及具備玻璃板之光學積層體。The present invention relates to an optical laminate having a glass plate.

已知有一種光學積層體，其具備玻璃板、接著劑層及三醋酸纖維素薄膜(例如參照下述專利文獻1)。玻璃板之光學特性優異，但另一方面耐衝擊性低。耐衝擊性係在玻璃板受到衝擊時，會抑制玻璃板發生包含裂痕之損傷的性質。An optical laminate having a glass plate, an adhesive layer, and a cellulose triacetate film is known (see, for example,Patent Document 1 below). The glass plate has excellent optical properties, but on the other hand, has low impact resistance. Impact resistance is the property of suppressing damage including cracks to the glass plate when the glass plate is impacted.

專利文獻1記載之光學積層體具備於有機EL顯示器中。以專利文獻1記載之光學積層體測定玻璃板之鉛筆硬度。鉛筆硬度係使鉛筆筆芯直接接觸玻璃板之表面(露出面)後，評估有無表面之傷痕來測定。因此，專利文獻1記載之光學積層體具備於有機EL顯示器時，玻璃板係配置於視辨側，而三醋酸纖維素薄膜係配置於有機EL構件側。 先前技術文獻 專利文獻The optical laminate described inPatent Document 1 is provided in an organic EL display. The optical laminate described inPatent Document 1 is used to measure the pencil hardness of a glass plate. The pencil hardness is measured by making a pencil lead directly contact the surface (exposed surface) of a glass plate and evaluating whether there are scratches on the surface. Therefore, when the optical laminate described inPatent Document 1 is provided in an organic EL display, the glass plate is arranged on the viewing side, and the cellulose triacetate film is arranged on the organic EL component side.Prior Art DocumentPatent Document

專利文獻1：日本專利特開2019-25899號公報Patent document 1: Japanese Patent Publication No. 2019-25899

發明欲解決之課題 近年來，要求更高等級之耐衝擊性。Problems to be solved by the inventionIn recent years, higher levels of impact resistance have been required.

用以解決課題之手段 因此，本案發明人等積極檢討，結果發現了一種新穎的光學積層體，其第2薄膜配置於玻璃板之視辨側，且第1薄膜配置於玻璃板之視辨側的對側，並且發現該光學積層體之耐衝擊性優異。Means for solving the problemTherefore, the inventors of this case actively examined and found a novel optical laminate, in which the second film is arranged on the visual side of the glass plate and the first film is arranged on the opposite side of the visual side of the glass plate, and found that the optical laminate has excellent impact resistance.

本發明(1)係一種光學積層體，其往厚度方向一側依序具備第1薄膜、第1接著劑層、玻璃板、第2接著劑層及第2薄膜；前述厚度方向一側係視辨側；在下述落筆破裂試驗中，直至前述玻璃板開始破裂為止之筆的落下高度H1為20cm以上。 ＜落筆破裂試驗＞ 將在25℃下之剪切儲存彈性模數G'為0.03MPa且厚度為15µm之黏著劑層配置於前述光學積層體之厚度方向另一面，前述在25℃下之剪切儲存彈性模數G'係藉由頻率1Hz、升溫速度5℃/分鐘、溫度-40℃~150℃、扭轉模式之動態黏彈性試驗求算。使7g且球珠徑0.7mm之原子筆朝前述第2薄膜落下。將筆之落下高度每次提高1cm且提高至30cm為止，並取得確認前述玻璃板有破裂時之高度作為落筆破裂試驗中之高度H1。或者，在筆之落下高度30cm未確認前述玻璃板有破裂時，判斷為具有30cm以上之抗破裂耐久性。The present invention (1) is an optical multilayer body, which has a first film, a first adhesive layer, a glass plate, a second adhesive layer and a second film in order on one side in the thickness direction; the aforementioned side in the thickness direction is a visual side; in the following pen drop fracture test, the pen drop height H1 until the aforementioned glass plate begins to fracture is greater than 20 cm.<Pen drop crack test>An adhesive layer with a shear storage modulus G' of 0.03MPa and a thickness of 15µm at 25°C is arranged on the other side of the thickness direction of the optical laminate. The shear storage modulus G' at 25°C is calculated by a dynamic viscoelastic test with a frequency of 1Hz, a heating rate of 5°C/min, a temperature of -40°C~150°C, and a torsion mode. A 7g ballpoint pen with a ball diameter of 0.7mm is dropped toward the second film. The drop height of the pen is increased by 1cm each time until it reaches 30cm, and the height at which the glass plate is confirmed to be cracked is taken as the height H1 in the pen drop crack test. Alternatively, when the glass plate is not confirmed to be cracked at a drop height of 30cm, it is judged to have a crack resistance durability of more than 30cm.

本發明(2)包含如(1)之光學積層體，其中在下述落筆剝落試驗中，直至前述第1薄膜或前述第2薄膜開始剝落為止之筆的落下高度H2為20cm以上。 ＜落筆剝落試驗＞ 將前述黏著劑層配置於前述光學積層體之厚度方向另一面。使7g且球珠徑0.7mm之原子筆朝前述第2薄膜落下。將筆之落下高度每次提高1cm且提高至30cm為止，並取得確認前述第1薄膜或前述第2薄膜有剝落時之高度作為落筆剝落試驗中之高度H2。或者，於確認前述玻璃板有破裂時，判斷為具有破裂高度H1以上之抗剝落耐久性。 或者，在筆之落下高度30cm未確認前述第1薄膜及前述第2薄膜有剝落時，判斷為具有30cm以上之抗剝落耐久性。The present invention (2) comprises an optical laminate as described in (1), wherein in the following pen-dropping test, the pen drop height H2 until the aforementioned first film or the aforementioned second film begins to peel off is greater than 20 cm. <Pen-dropping test>The aforementioned adhesive layer is disposed on the other side of the aforementioned optical laminate in the thickness direction. A 7g ballpoint pen with a ball diameter of 0.7mm is dropped toward the aforementioned second film. The pen drop height is increased by 1 cm each time until it reaches 30 cm, and the height when the aforementioned first film or the aforementioned second film is confirmed to have peeled off is obtained as the height H2 in the pen-dropping test. Alternatively, when the aforementioned glass plate is confirmed to have cracks, it is judged to have anti-peeling durability with a crack height greater than H1.Alternatively, when the pen is dropped at a height of 30 cm and no peeling of the first film and the second film is observed, it is judged that the film has an anti-peeling durability of more than 30 cm.

本發明(3)包含如(1)或(2)之光學積層體，其中相對於前述第1薄膜藉由頻率10Hz、升溫速度2℃/分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值，前述第2薄膜藉由前述動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值之比為0.8以上且1.5以下。The present invention (3) comprises an optical multilayer as described in (1) or (2), wherein the ratio of the average value of tanδ of the first film at -100°C to -50°C calculated by a dynamic viscoelasticity test at a frequency of 10 Hz, a heating rate of 2°C/min, and a tensile mode to the average value of tanδ of the second film at -100°C to -50°C calculated by the dynamic viscoelasticity test is greater than 0.8 and less than 1.5.

本發明(4)包含如(1)至(3)中任一項之光學積層體，其中前述第1薄膜藉由頻率10Hz、升溫速度2℃/分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值為0.04以上；並且，前述第1薄膜藉由前述動態黏彈性試驗求算之在-100℃至-50℃下之拉伸儲存彈性模數E'的平均值為3GPa以上且6GPa以下。The present invention (4) comprises an optical multilayer as described in any one of (1) to (3), wherein the average value of tanδ of the aforementioned first film at -100°C to -50°C calculated by a dynamic viscoelastic test in a tensile mode at a frequency of 10 Hz, a heating rate of 2°C/min, is greater than 0.04; and the average value of the tensile storage elastic modulus E' of the aforementioned first film at -100°C to -50°C calculated by the aforementioned dynamic viscoelastic test is greater than 3 GPa and less than 6 GPa.

本發明(5)包含如(1)至(4)中任一項之光學積層體，其中前述第1薄膜與前述第1接著劑層之密著力為3.0kN/m以上，前述第1接著劑層與前述玻璃板之密著力為3.0kN/m以上，前述玻璃板與前述第2接著劑層之密著力為3.0kN/m以上，且前述第2接著劑層與前述第2薄膜之密著力為3.0kN/m以上。The present invention (5) comprises an optical laminate as described in any one of (1) to (4), wherein the adhesion between the first film and the first adhesive layer is greater than 3.0 kN/m, the adhesion between the first adhesive layer and the glass plate is greater than 3.0 kN/m, the adhesion between the glass plate and the second adhesive layer is greater than 3.0 kN/m, and the adhesion between the second adhesive layer and the second film is greater than 3.0 kN/m.

本發明(6)包含如(1)至(5)中任一項之光學積層體，其中前述第1薄膜與前述第2薄膜分別為三醋酸纖維素薄膜。The present invention (6) comprises the optical laminate as described in any one of (1) to (5), wherein the first film and the second film are cellulose triacetate films respectively.

本發明(7)包含如(6)之光學積層體，其中前述第2薄膜較前述第1薄膜更厚。The present invention (7) comprises an optical layered structure as described in (6), wherein the second film is thicker than the first film.

本發明(8)包含如(7)之光學積層體，其更具備配置於前述第2薄膜之前述厚度方向一面的硬塗層。The present invention (8) comprises the optical multilayer body as described in (7), further comprising a hard coating layer disposed on one surface of the second film in the thickness direction.

發明效果 本發明光學積層體中，第2薄膜係配置於視辨側，且在落筆破裂試驗中直至玻璃板開始破裂為止之筆的落下高度H1為20cm以上，因此耐衝擊性優異。Effect of the inventionIn the optical laminate of the present invention, the second film is arranged on the visual side, and the drop height H1 of the pen until the glass plate begins to break in the pen drop fracture test is more than 20 cm, so the impact resistance is excellent.

＜光學積層體1＞ 參照圖1至圖3說明本發明光學積層體之一實施形態。<Optical laminate 1>An embodiment of the optical laminate of the present invention will be described with reference to FIGS. 1 to 3.

該光學積層體1例如具有朝面方向延伸之平板形狀。面方向係與光學積層體1之厚度方向正交。光學積層體1具備於有機電致發光顯示裝置10(參照圖3)時，係配置於使用者視辨之側的視辨側(以下僅稱為視辨側)。光學積層體1往厚度方向一側依序具備第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5及第2薄膜6。 厚度方向一側係視辨側。厚度方向另一側係視辨側之對側(以下僅稱為對側)。Theoptical laminate 1 has, for example, a flat plate shape extending in the surface direction. The surface direction is orthogonal to the thickness direction of theoptical laminate 1. When theoptical laminate 1 is provided in the organic electroluminescent display device 10 (refer to FIG. 3 ), it is arranged on the viewing side of the user's viewing side (hereinafter referred to as the viewing side). Theoptical laminate 1 has afirst film 2, a firstadhesive layer 3, aglass plate 4, a secondadhesive layer 5 and asecond film 6 in sequence on one side in the thickness direction.One side in the thickness direction is the viewing side. The other side in the thickness direction is the opposite side of the viewing side (hereinafter referred to as the opposite side).

＜第1薄膜2＞ 第1薄膜2係朝面方向延伸。第1薄膜2係形成光學積層體1之厚度方向另一面(對側面)。<First film 2>Thefirst film 2 extends in the surface direction. Thefirst film 2 forms the other surface (opposite side surface) of theoptical laminate 1 in the thickness direction.

第1薄膜2藉由頻率10Hz、升溫速度2℃/分鐘、數據取得間隔0.5分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值例如為0.02以上，宜為0.04以上，又例如為0.20以下，宜小於0.06，較宜為0.05以下。第1薄膜2在-100℃至-50℃下之tanδ的平均值若大於上述下限，便可提升光學積層體1之耐衝擊性。第1薄膜2在-100℃至-50℃下之tanδ的平均值係顯示物體高速衝撞光學積層體1時之反應度的指標。tanδ的平均值若高，則即使物體高速衝撞玻璃板4，第1薄膜2仍可充分緩和玻璃板4受到之衝擊，而可提升光學積層體1之耐衝擊性。動態黏彈性試驗記載於之後之實施例中。The average value of tanδ of thefirst film 2 at -100°C to -50°C calculated by a dynamic viscoelastic test in a tensile mode with a frequency of 10 Hz, a heating rate of 2°C/min, a data acquisition interval of 0.5 min is, for example, greater than 0.02, preferably greater than 0.04, and for example less than 0.20, preferably less than 0.06, and more preferably less than 0.05. If the average value of tanδ of thefirst film 2 at -100°C to -50°C is greater than the above lower limit, the impact resistance of theoptical laminate 1 can be improved. The average value of tanδ of thefirst film 2 at -100°C to -50°C is an indicator of the reactivity when an object collides with theoptical laminate 1 at high speed. If the average value of tanδ is high, even if an object collides with theglass plate 4 at high speed, thefirst film 2 can still sufficiently mitigate the impact on theglass plate 4, thereby improving the impact resistance of theoptical laminate 1. The dynamic viscoelasticity test is described in the following examples.

第1薄膜2藉由頻率10Hz、升溫速度2℃/分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之拉伸儲存彈性模數E'的平均值例如為3GPa以上，且宜為4GPa以上，又例如為10GPa以下，宜為6GPa以下，較宜為5GPa以下，更宜為4.7GPa以下。第1薄膜2在-100℃至-50℃下之拉伸儲存彈性模數E’的平均值若在上述下限以上，便可提升光學積層體1之耐衝擊性。The average value of the tensile storage modulus E' of thefirst film 2 at -100°C to -50°C calculated by a dynamic viscoelastic test in a tensile mode with a frequency of 10 Hz, a heating rate of 2°C/min, is, for example, 3 GPa or more, preferably 4 GPa or more, and for example, 10 GPa or less, preferably 6 GPa or less, more preferably 5 GPa or less, and more preferably 4.7 GPa or less. If the average value of the tensile storage modulus E' of thefirst film 2 at -100°C to -50°C is above the above lower limit, the impact resistance of theoptical laminate 1 can be improved.

第1薄膜2可舉例如聚酯薄膜及纖維素薄膜。聚酯薄膜可舉例如聚對苯二甲酸乙二酯薄膜(PET)、聚對苯二甲酸丁二酯(PBT)薄膜及聚萘二甲酸乙二酯(PEN)薄膜。纖維素薄膜可舉例如二醋酸纖維素薄膜，具體上可舉三醋酸纖維素(TAC)薄膜。由提高第1薄膜2對第1接著劑層3之密著力的觀點來看，第1薄膜2宜可舉纖維素薄膜，較佳可舉TAC薄膜。Thefirst film 2 may be, for example, a polyester film and a cellulose film. Examples of the polyester film include polyethylene terephthalate film (PET), polybutylene terephthalate (PBT) film, and polyethylene naphthalate (PEN) film. Examples of the cellulose film include cellulose diacetate film, and more specifically, cellulose triacetate (TAC) film. From the perspective of improving the adhesion of thefirst film 2 to the firstadhesive layer 3, thefirst film 2 may preferably be a cellulose film, and more preferably a TAC film.

第1薄膜2之厚度無限定。第1薄膜2之厚度例如為10µm以上，且宜為20µm以上。第1薄膜2之厚度若在上述下限以上，便可提升光學積層體1之耐衝擊性。又，第1薄膜2之厚度例如為200µm以下，宜為150µm以下，較宜為100µm以下，更宜為80µm以下，特別宜為50µm以下，最宜為30µm以下，且23µm以下為佳。The thickness of thefirst film 2 is not limited. The thickness of thefirst film 2 is, for example, 10 µm or more, and preferably 20 µm or more. If the thickness of thefirst film 2 is above the above lower limit, the impact resistance of theoptical laminate 1 can be improved. In addition, the thickness of thefirst film 2 is, for example, 200 µm or less, preferably 150 µm or less, more preferably 100 µm or less, more preferably 80 µm or less, particularly preferably 50 µm or less, most preferably 30 µm or less, and preferably 23 µm or less.

第1薄膜2之全光線透射率例如為40%以上，且宜為50%以上，又例如為99%以下。The total light transmittance of thefirst film 2 is, for example, 40% or more, preferably 50% or more, and for example, 99% or less.

＜第1接著劑層3＞ 第1接著劑層3係朝面方向延伸。第1接著劑層3係配置於第1薄膜2之厚度方向一面。具體而言，第1接著劑層3係接觸第1薄膜2之厚度方向一面。第1接著劑層3並非由黏著劑(壓敏接著劑)構成之黏著劑層(壓敏接著劑層)，而是硬化型接著劑之硬化物。詳細而言，第1接著劑層3係藉由活性能量線之照射或加熱而進行硬化反應之硬化型接著劑之硬化物。<Firstadhesive layer 3>The firstadhesive layer 3 extends in the surface direction. The firstadhesive layer 3 is disposed on one side of thefirst film 2 in the thickness direction. Specifically, the firstadhesive layer 3 contacts one side of thefirst film 2 in the thickness direction. The firstadhesive layer 3 is not an adhesive layer (pressure-sensitive adhesive layer) composed of an adhesive (pressure-sensitive adhesive), but a cured product of a curing type adhesive. Specifically, the firstadhesive layer 3 is a cured product of a curing type adhesive that undergoes a curing reaction by irradiation with active energy rays or heating.

硬化型接著劑係第1接著劑層3之硬化原料，可舉活性能量硬化型及熱硬化型，較佳可舉活性能量硬化型。具體而言，硬化型接著劑可舉例如丙烯酸接著劑組成物、環氧接著劑組成物及聚矽氧接著劑組成物，而由獲得優異耐衝擊性之觀點來看，可舉環氧接著劑組成物。The curing type adhesive is a curing material of the firstadhesive layer 3, and may be an active energy curing type or a heat curing type, and preferably an active energy curing type. Specifically, the curing type adhesive may be, for example, an acrylic adhesive composition, an epoxy adhesive composition, and a silicone adhesive composition, and from the viewpoint of obtaining excellent impact resistance, an epoxy adhesive composition may be used.

環氧接著劑組成物包含環氧樹脂作為主劑。環氧樹脂可舉例如含有2個環氧基之2官能環氧樹脂、含有3個以上環氧基之多官能環氧樹脂等。該等可單獨使用或可併用2種以上。 較佳可舉併用2官能環氧樹脂與多官能環氧樹脂。The epoxy adhesive composition includes an epoxy resin as a main agent. Examples of the epoxy resin include a bifunctional epoxy resin containing two epoxy groups and a polyfunctional epoxy resin containing three or more epoxy groups. These can be used alone or in combination of two or more.Preferably, a bifunctional epoxy resin and a polyfunctional epoxy resin are used in combination.

2官能環氧樹脂可舉例如雙酚型環氧樹脂、酚醛型環氧樹脂、萘型環氧樹脂、茀型環氧樹脂、三苯甲烷型環氧樹脂等芳香族系環氧樹脂，且可舉例如三聚異氰酸三環氧丙酯、乙內醯脲環氧樹脂等含氮環環氧樹脂，更可舉脂肪族型環氧樹脂、環氧丙基醚型環氧樹脂、環氧丙基胺型環氧樹脂。2官能環氧樹脂較佳可舉脂肪族型環氧樹脂。脂肪族型環氧樹脂包含脂肪族脂環式環氧樹脂。2官能環氧樹脂之環氧當量例如為100g/eq.以上，且宜為120g/eq.以上，又例如為250g/eq.以下，且宜為150g/eq.以下。環氧樹脂中之2官能環氧樹脂之比率例如為80質量%以上，且宜為90質量%以上，又例如為99質量%以下，且宜為97質量%以下。Examples of the bifunctional epoxy resin include aromatic epoxy resins such as bisphenol epoxy resins, phenolic epoxy resins, naphthalene epoxy resins, fluorene epoxy resins, and triphenylmethane epoxy resins, and examples of nitrogen-containing epoxy resins such as triisocyanurate triglycidyl ester and hydantoin epoxy resins, and examples of aliphatic epoxy resins, glycidyl ether epoxy resins, and glycidyl amine epoxy resins. The bifunctional epoxy resin is preferably an aliphatic epoxy resin. Aliphatic epoxy resins include aliphatic alicyclic epoxy resins. The epoxy equivalent of the bifunctional epoxy resin is, for example, 100 g/eq. or more, preferably 120 g/eq. or more, and for example, 250 g/eq. or less, and preferably 150 g/eq. or less. The ratio of the bifunctional epoxy resin in the epoxy resin is, for example, 80 mass % or more, and preferably 90 mass % or more, and for example, 99 mass % or less, and preferably 97 mass % or less.

多官能環氧樹脂可舉例如苯酚酚醛型環氧樹脂、甲酚酚醛型環氧樹脂、參羥甲苯型環氧樹脂、四羥苯基乙烷型環氧樹脂、二環戊二烯型環氧樹脂、3官能脂肪族環氧樹脂等3官能以上之多官能環氧樹脂。多官能環氧樹脂較佳可舉3官能脂肪族環氧樹脂。多官能環氧樹脂之環氧當量例如為130g/eq.以上，且宜為150g/eq.以上，又例如為220g/eq.以下，且宜為200g/eq.以下。環氧樹脂中之多官能環氧樹脂之比率例如為1質量%以上，且宜為3質量%以上，又例如為20質量%以下，且宜為10質量%以下。Examples of the polyfunctional epoxy resin include phenol novolac epoxy resin, cresol novolac epoxy resin, hydroxytoluene epoxy resin, tetrahydroxyphenylethane epoxy resin, dicyclopentadiene epoxy resin, trifunctional aliphatic epoxy resin and other polyfunctional epoxy resins having three or more functions. The polyfunctional epoxy resin is preferably a trifunctional aliphatic epoxy resin. The epoxy equivalent of the polyfunctional epoxy resin is, for example, 130 g/eq. or more, preferably 150 g/eq. or more, and, for example, 220 g/eq. or less, preferably 200 g/eq. or less. The ratio of the multifunctional epoxy resin in the epoxy resin is, for example, 1 mass % or more, and preferably 3 mass % or more, and for example, 20 mass % or less, and preferably 10 mass % or less.

環氧接著劑組成物中之環氧樹脂之比率例如為60質量%以上，且宜為75質量%以上，又例如為90質量%以下，且宜為80質量%以下。The ratio of the epoxy resin in the epoxy adhesive composition is, for example, 60 mass % or more, preferably 75 mass % or more, and for example, 90 mass % or less, preferably 80 mass % or less.

環氧樹脂可使用市售物，脂肪族脂環式環氧樹脂可使用CELLOXIDE 2021P(Daicel化學公司製)，3官能脂肪族環氧樹脂可使用EHPE3150(Daicel化學公司製)等。As the epoxy resin, a commercially available one can be used. As the aliphatic epoxy resin, CELLOXIDE 2021P (manufactured by Daicel Chemical Co., Ltd.) can be used, and as the trifunctional aliphatic epoxy resin, EHPE3150 (manufactured by Daicel Chemical Co., Ltd.) can be used.

又，環氧接著劑組成物若為活性能量硬化型，則會包含光酸產生劑。光酸產生劑可舉例如三芳基鋶鹽等。光酸產生劑可使用市售物，三芳基鋶鹽可使用CPI101A(San-Apro公司製)等。環氧接著劑組成物中之光酸產生劑之比率例如為1質量%以上，且宜為10質量%以上，又例如為30質量%以下，且宜為20質量%以下。Furthermore, if the epoxy adhesive composition is of the active energy curing type, it will contain a photoacid generator. The photoacid generator may be, for example, a triaryl coronium salt. Commercially available photoacid generators may be used, and triaryl coronium salts may be CPI101A (manufactured by San-Apro Co., Ltd.). The ratio of the photoacid generator in the epoxy adhesive composition is, for example, 1% by mass or more, preferably 10% by mass or more, and for example, 30% by mass or less, preferably 20% by mass or less.

並且，環氧接著劑組成物例如可以適當之比率包含氧雜環丁烷系樹脂、矽烷耦合劑等添加劑。Furthermore, the epoxy adhesive composition may include additives such as cyclohexane-based resins and silane coupling agents at appropriate ratios.

氧雜環丁烷系樹脂可舉例如3-乙-3-氧雜環丁烷甲醇、2-乙基己基氧雜環丁烷等單官能氧雜環丁烷，可舉例如伸茬基雙氧雜環丁烷、3-乙-3{[(3-乙基氧雜環丁烷-3-基)甲氧基]甲基}氧雜環丁烷等2官能氧雜環丁烷。氧雜環丁烷系樹脂可使用市售物，可使用ARON OXETANE(東亞合成公司製)等。Examples of the cyclohexane resin include monofunctional cyclohexane such as 3-ethyl-3-cyclohexanemethanol and 2-ethylhexylcyclohexane, and examples of bifunctional cyclohexane such as stilbene dicyclohexane and 3-ethyl-3{[(3-ethylcyclohexane-3-yl)methoxy]methyl}cyclohexane. Commercially available cyclohexane resins can be used, and ARON OXETANE (manufactured by Toagosei Co., Ltd.) can be used.

矽烷耦合劑可舉例如3-環氧丙氧基丙基三甲氧基矽烷等含環氧基之矽烷耦合劑等。矽烷耦合劑可使用市售物，可舉KBM系列(信越Silicones公司製)等。Examples of the silane coupling agent include epoxy group-containing silane coupling agents such as 3-glycidoxypropyltrimethoxysilane, etc. Commercially available silane coupling agents can be used, and examples thereof include KBM series (manufactured by Shin-Etsu Silicones Co., Ltd.).

第1接著劑層3之厚度無限定。第1接著劑層3之厚度例如為0.1µm以上，又例如為10µm以下，宜為5µm以下，3µm以下較佳。The thickness of the firstadhesive layer 3 is not limited. The thickness of the firstadhesive layer 3 is, for example, 0.1 µm or more, or, for example, 10 µm or less, preferably 5 µm or less, and more preferably 3 µm or less.

第1接著劑層3之全光線透射率例如為80%以上，且宜為85%以上，又例如為99%以下。The total light transmittance of the firstadhesive layer 3 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less.

第1接著劑層3在25℃下之拉伸儲存彈性模數E'例如為1GPa以上，且宜為2GPa以上，較宜為3GPa以上，更宜為4GPa以上，又例如為100GPa以下。第1接著劑層3在25℃下之拉伸儲存彈性模數E'可藉由在頻率1Hz、升溫速度5℃/分鐘之條件的溫度分散模式下測定動態黏彈性來求算。又，第1接著劑層3利用奈米壓痕儀法測定之在25℃下之彈性模數為1GPa以上，且宜為2GPa以上，較宜為3GPa以上，更宜為4GPa以上，又例如為100GPa以下。奈米壓痕儀法之測定條件如下述。The tensile storage modulus E' of the firstadhesive layer 3 at 25°C is, for example, 1 GPa or more, and preferably 2 GPa or more, more preferably 3 GPa or more, more preferably 4 GPa or more, and for example, 100 GPa or less. The tensile storage modulus E' of the firstadhesive layer 3 at 25°C can be calculated by measuring the dynamic viscoelasticity in a temperature dispersion mode under the conditions of a frequency of 1 Hz and a heating rate of 5°C/min. In addition, the elastic modulus of the firstadhesive layer 3 at 25°C measured by the nanoindenter method is 1 GPa or more, and preferably 2 GPa or more, more preferably 3 GPa or more, more preferably 4 GPa or more, and for example, 100 GPa or less. The measurement conditions of the nanoindenter method are as follows.

裝置：Triboindenter(Hysitron Inc.製) 試樣尺寸：10×10mm 壓頭：Concial(球形壓頭：曲率半徑10µm)、 測定方法：單一壓痕測定 測定溫度：25℃ 壓頭之壓痕深度：100nm 溫度：25℃ 解析：根據荷重-位移曲線之Oliver Pharr解析Device: Triboindenter (manufactured by Hysitron Inc.)Sample size: 10×10mmIndenter: Concial (spherical indenter: radius of curvature 10µm),Measurement method: single indentation measurementMeasurement temperature: 25℃Indentation depth of indenter: 100nmTemperature: 25℃Analysis: Based on Oliver Pharr analysis of load-displacement curve

第1薄膜2與第1接著劑層3之密著力例如為0.5kN/m以上，且宜為1.5kN/m以上，較宜為3.0kN/m以上，更宜為3.5kN/m以上，特別宜為4.0kN/m以上，最宜為5.0kN/m以上，又例如為10kN/m以下。第1薄膜2與第1接著劑層3之密著力係以下述方式求得：如圖2B所示，將裝置41具備之刀42之刀尖43插入第1薄膜2與第1接著劑層3之界面，使刀42沿面方向移動，並求出第1薄膜2從第1接著劑層3剝離時之剝離強度而得。密著力之測定方法的詳細內容記載於之後之實施例中。第1薄膜2與第1接著劑層3之密著力若在上述下限以上，便可抑制第1薄膜2從第1接著劑層3之剝落。The adhesion between thefirst film 2 and the firstadhesive layer 3 is, for example, 0.5 kN/m or more, preferably 1.5 kN/m or more, more preferably 3.0 kN/m or more, more preferably 3.5 kN/m or more, particularly preferably 4.0 kN/m or more, most preferably 5.0 kN/m or more, and for example, 10 kN/m or less. The adhesion between thefirst film 2 and the firstadhesive layer 3 is obtained in the following manner: as shown in FIG. 2B , thetip 43 of theknife 42 of thedevice 41 is inserted into the interface between thefirst film 2 and the firstadhesive layer 3, theknife 42 is moved in the surface direction, and the peeling strength when thefirst film 2 is peeled off from the firstadhesive layer 3 is obtained. The details of the method for measuring the adhesion are described in the following examples. If the adhesion between thefirst film 2 and the firstadhesive layer 3 is greater than the above lower limit, thefirst film 2 can be prevented from peeling off from the firstadhesive layer 3.

＜玻璃板4＞ 玻璃板4係朝面方向延伸。玻璃板4位於第1接著劑層3之相對於第1薄膜2之相反側。玻璃板4係配置於第1接著劑層3之厚度方向一面。 具體而言，玻璃板4係接觸第1接著劑層3之厚度方向一面。藉此，第1接著劑層3係接觸玻璃板4之厚度方向另一面及第1薄膜2之厚度方向一面，而接著(接合)第1薄膜2與玻璃板4。<Glass plate 4>Theglass plate 4 extends in the surface direction. Theglass plate 4 is located on the opposite side of the firstadhesive layer 3 relative to thefirst film 2. Theglass plate 4 is arranged on one side of the firstadhesive layer 3 in the thickness direction.Specifically, theglass plate 4 contacts one side of the firstadhesive layer 3 in the thickness direction. Thereby, the firstadhesive layer 3 contacts the other side of theglass plate 4 in the thickness direction and one side of thefirst film 2 in the thickness direction, thereby connecting (bonding) thefirst film 2 and theglass plate 4.

玻璃板4之全光線透射率例如為80%以上，且宜為85%以上，又例如為99%以下。玻璃板4可使用市售物，例如可使用G-leaf系列(註冊商標，日本電氣硝子公司製)。The total light transmittance of theglass plate 4 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less. Theglass plate 4 can be a commercially available product, for example, G-leaf series (registered trademark, manufactured by Nippon Electric Glass Co., Ltd.) can be used.

玻璃板4與第1接著劑層3之密著力例如為3.0kN/m以上，且宜為3.5kN/m以上，較宜為4.0kN/m以上，又例如為10kN/m以下。玻璃板4與第1接著劑層3之密著力係以下述方式求得：如圖2C所示，將裝置41具備之刀42之刀尖43插入玻璃板4與第1接著劑層3之界面，使刀42沿面方向移動，並求出玻璃板4從第1接著劑層3剝離時之剝離強度而得。密著力之測定方法的詳細內容記載於之後之實施例中。The adhesion between theglass plate 4 and the firstadhesive layer 3 is, for example, 3.0 kN/m or more, preferably 3.5 kN/m or more, more preferably 4.0 kN/m or more, and for example, 10 kN/m or less. The adhesion between theglass plate 4 and the firstadhesive layer 3 is obtained in the following manner: as shown in FIG. 2C , thetip 43 of theknife 42 provided in thedevice 41 is inserted into the interface between theglass plate 4 and the firstadhesive layer 3, theknife 42 is moved along the surface direction, and the peeling strength when theglass plate 4 is peeled off from the firstadhesive layer 3 is obtained. The details of the method for measuring the adhesion are described in the following embodiments.

玻璃板4之厚度無限定。玻璃板4之厚度例如為5µm以上，宜為10µm以上，較宜為20µm。玻璃板4之厚度為100µm以下，宜為80µm以下，較宜為60µm以下，更宜為50µm以下。The thickness of theglass plate 4 is not limited. For example, the thickness of theglass plate 4 is 5 μm or more, preferably 10 μm or more, and more preferably 20 μm. The thickness of theglass plate 4 is 100 μm or less, preferably 80 μm or less, more preferably 60 μm or less, and more preferably 50 μm or less.

＜第2接著劑層5＞ 第2接著劑層5係朝面方向延伸。第2接著劑層5係配置於玻璃板4之厚度方向一面。具體而言，第2接著劑層5係接觸玻璃板4之厚度方向一面。第2接著劑層5並非由黏著劑(壓敏接著劑)構成之黏著劑層(壓敏接著劑層)，而是硬化型接著劑之硬化物。詳細而言，第2接著劑層5係藉由活性能量線之照射或加熱而進行硬化反應之硬化型接著劑之硬化物。第2接著劑層5之硬化原料、厚度、全光線透射率、拉伸儲存彈性模數E'及利用奈米壓痕儀法測定之彈性模數，係與第1接著劑層3之硬化原料、厚度、全光線透射率、拉伸儲存彈性模數E'及利用奈米壓痕儀法測定之彈性模數相同。<Secondadhesive layer 5>The secondadhesive layer 5 extends in the surface direction. The secondadhesive layer 5 is disposed on one side of theglass plate 4 in the thickness direction. Specifically, the secondadhesive layer 5 contacts one side of theglass plate 4 in the thickness direction. The secondadhesive layer 5 is not an adhesive layer (pressure-sensitive adhesive layer) composed of an adhesive (pressure-sensitive adhesive), but a cured product of a curing type adhesive. Specifically, the secondadhesive layer 5 is a cured product of a curing type adhesive that undergoes a curing reaction by irradiation with active energy rays or heating. The curing material, thickness, total light transmittance, tensile storage modulus E' and elastic modulus measured by nanoindenter method of the secondadhesive layer 5 are the same as the curing material, thickness, total light transmittance, tensile storage modulus E' and elastic modulus measured by nanoindenter method of the firstadhesive layer 3.

玻璃板4與第2接著劑層5之密著力例如為3.0kN/m以上，且宜為3.5kN/m以上，較宜為4.0kN/m以上，又例如為10kN/m以下。玻璃板4與第2接著劑層5之密著力可藉由與上述玻璃板4與第1接著劑層3之密著力的測定方法相同之方法求得。The adhesion between theglass plate 4 and the secondadhesive layer 5 is, for example, 3.0 kN/m or more, preferably 3.5 kN/m or more, more preferably 4.0 kN/m or more, and for example, 10 kN/m or less. The adhesion between theglass plate 4 and the secondadhesive layer 5 can be obtained by the same method as the method for measuring the adhesion between theglass plate 4 and the firstadhesive layer 3.

＜第2薄膜6＞ 第2薄膜6係形成光學積層體1之厚度方向一面(視辨側面)。第2薄膜6位於第2接著劑層5之相對於玻璃板4的相反側。第2薄膜6係朝面方向延伸。第2薄膜6係配置於第2接著劑層5之厚度方向一面。第2薄膜6係接觸第2接著劑層5之厚度方向一面。藉此，第2接著劑層5係接觸玻璃板4之厚度方向一面及第2薄膜6之厚度方向另一面，而接著(接合)玻璃板4與第2薄膜6。<Second film 6>Thesecond film 6 forms one side (visible side) of theoptical laminate 1 in the thickness direction. Thesecond film 6 is located on the opposite side of the secondadhesive layer 5 relative to theglass plate 4. Thesecond film 6 extends in the surface direction. Thesecond film 6 is arranged on one side of the secondadhesive layer 5 in the thickness direction. Thesecond film 6 contacts one side of the secondadhesive layer 5 in the thickness direction. Thus, the secondadhesive layer 5 contacts one side of theglass plate 4 in the thickness direction and the other side of thesecond film 6 in the thickness direction, thereby connecting (joining) theglass plate 4 and thesecond film 6.

第2薄膜6藉由頻率10Hz、升溫速度2℃/分鐘、數據取得間隔0.5分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值，係設定成以與後述之第1薄膜2之tanδ的平均值之比成為特定範圍。第2薄膜6在-100℃至-50℃下之tanδ的平均值例如為0.02以上，宜為0.04以上，又例如為0.20以下，宜小於0.06，較宜為0.05以下。第2薄膜6在-100℃至-50℃下之tanδ的平均值若大於上述下限，便可提升光學積層體1之耐衝擊性。第2薄膜6在-100℃至-50℃下之tanδ的平均值係顯示物體高速衝撞光學積層體1時之反應度的指標。tanδ的平均值若高，則即使物體高速衝撞玻璃板4，第2薄膜6仍可充分緩和玻璃板4受到之衝擊，而可提升光學積層體1之耐衝擊性。動態黏彈性試驗記載於之後之實施例中。The average value of tanδ of thesecond film 6 at -100°C to -50°C calculated by a dynamic viscoelastic test in a tensile mode at a frequency of 10 Hz, a heating rate of 2°C/min, a data acquisition interval of 0.5 min is set to be within a specific range in ratio to the average value of tanδ of thefirst film 2 described later. The average value of tanδ of thesecond film 6 at -100°C to -50°C is, for example, greater than 0.02, preferably greater than 0.04, and, for example, less than 0.20, preferably less than 0.06, and more preferably less than 0.05. If the average value of tanδ of thesecond film 6 at -100°C to -50°C is greater than the above lower limit, the impact resistance of theoptical laminate 1 can be improved. The average value of tanδ of thesecond film 6 at -100°C to -50°C is an indicator of the responsiveness of theoptical laminate 1 when an object collides with theoptical laminate 1 at high speed. If the average value of tanδ is high, thesecond film 6 can still sufficiently mitigate the impact on theglass plate 4 even if the object collides with theglass plate 4 at high speed, thereby improving the impact resistance of theoptical laminate 1. The dynamic viscoelastic test is described in the following examples.

第2薄膜在-100℃至-50℃下之tanδ的平均值相對於第1薄膜在-100℃至-50℃下之tanδ的平均值之比例如為0.5以上，宜為0.8以上，較宜為0.9以上，又例如為2.0以下，宜為1.5以下，較宜為1.1以下。上述比若在上述下限以上且在上限以下，便可提升光學積層體1之耐衝擊性。The ratio of the average value of tanδ of the second film at -100°C to -50°C to the average value of tanδ of the first film at -100°C to -50°C is, for example, 0.5 or more, preferably 0.8 or more, more preferably 0.9 or more, and for example, 2.0 or less, preferably 1.5 or less, more preferably 1.1 or less. If the above ratio is above the above lower limit and below the upper limit, the impact resistance of theoptical laminate 1 can be improved.

第2薄膜6藉由頻率10Hz、升溫速度2℃/分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之拉伸儲存彈性模數E'的平均值例如為3GPa以上，且宜為4GPa以上，又例如為10GPa以下，宜為6GPa以下，較宜為5GPa以下，更宜為4.7GPa以下。第2薄膜6在-100℃至-50℃下之拉伸儲存彈性模數E’的平均值若在上述下限以上，便可提升光學積層體1之耐衝擊性。The average value of the tensile storage modulus E' of thesecond film 6 at -100°C to -50°C calculated by a dynamic viscoelastic test in a tensile mode with a frequency of 10 Hz, a heating rate of 2°C/min, is, for example, 3 GPa or more, preferably 4 GPa or more, and for example, 10 GPa or less, preferably 6 GPa or less, preferably 5 GPa or less, and more preferably 4.7 GPa or less. If the average value of the tensile storage modulus E' of thesecond film 6 at -100°C to -50°C is above the above lower limit, the impact resistance of theoptical laminate 1 can be improved.

第2薄膜6與第2接著劑層5之密著力例如為0.5kN/m以上，且宜為1.5kN/m以上，較宜為3.0kN/m以上，更宜為3.5kN/m以上，特別宜為4.0kN/m以上，最宜為5.0kN/m以上，又例如為10kN/m以下。第2薄膜6與第2接著劑層5之密著力若在上述下限以上，於物體衝撞光學積層體1之第2薄膜6時，可抑制於第2薄膜6與第2接著劑層5之界面的剝離。第2薄膜6與第2接著劑層5之密著力可藉由與上述第1薄膜2與第1接著劑層3之密著力的測定方法相同之方法求得。The adhesion between thesecond film 6 and the secondadhesive layer 5 is, for example, 0.5 kN/m or more, preferably 1.5 kN/m or more, more preferably 3.0 kN/m or more, more preferably 3.5 kN/m or more, particularly preferably 4.0 kN/m or more, most preferably 5.0 kN/m or more, and for example, 10 kN/m or less. If the adhesion between thesecond film 6 and the secondadhesive layer 5 is above the above lower limit, when an object collides with thesecond film 6 of theoptical laminate 1, peeling at the interface between thesecond film 6 and the secondadhesive layer 5 can be suppressed. The adhesion between thesecond film 6 and the secondadhesive layer 5 can be obtained by the same method as the method for measuring the adhesion between thefirst film 2 and the firstadhesive layer 3.

第2薄膜6可舉例如於第1薄膜2所例示之薄膜。由提高第2薄膜6對第2接著劑層5之密著力，以抑制物體衝撞光學積層體1時之第2薄膜6之剝離的觀點來看，第2薄膜6宜可舉纖維素薄膜，較佳可舉TAC薄膜。Thesecond film 6 may be, for example, the film exemplified in thefirst film 2. From the viewpoint of improving the adhesion of thesecond film 6 to the secondadhesive layer 5 to suppress the peeling of thesecond film 6 when an object collides with theoptical laminate 1, thesecond film 6 may preferably be a cellulose film, more preferably a TAC film.

第1薄膜2及第2薄膜6之組合宜可舉以下組合：第1薄膜2為PET薄膜且第2薄膜6為TAC薄膜之組合、第1薄膜2為TAC薄膜且第2薄膜6為TAC薄膜之組合。 較佳可舉第1薄膜2為TAC薄膜且第2薄膜6為TAC薄膜之組合，亦即第1薄膜2及第2薄膜6分別為TAC薄膜之組合。The combination of thefirst film 2 and thesecond film 6 may be preferably the following combinations: a combination in which thefirst film 2 is a PET film and thesecond film 6 is a TAC film, or a combination in which thefirst film 2 is a TAC film and thesecond film 6 is a TAC film.Preferably, the combination in which thefirst film 2 is a TAC film and thesecond film 6 is a TAC film, that is, the combination in which thefirst film 2 and thesecond film 6 are respectively TAC films, may be cited.

第2薄膜6之厚度無限定。宜為第2薄膜6較第1薄膜2更厚。尤其，第1薄膜2及第2薄膜6分別若為TAC薄膜，則第2薄膜6較第1薄膜2更厚。第2薄膜6若較第1薄膜2更厚，便可提高光學積層體1之耐衝擊性，同時可抑制第2薄膜6之剝離。The thickness of thesecond film 6 is not limited. Thesecond film 6 is preferably thicker than thefirst film 2. In particular, if thefirst film 2 and thesecond film 6 are TAC films, thesecond film 6 is thicker than thefirst film 2. If thesecond film 6 is thicker than thefirst film 2, the impact resistance of theoptical laminate 1 can be improved, and the peeling of thesecond film 6 can be suppressed.

具體而言，第2薄膜6之厚度例如為10µm以上，宜為20µm以上，較宜為30µm以上。第2薄膜6之厚度若在上述下限以上，便可提升光學積層體1之耐衝擊性。又，第2薄膜6之厚度例如為200µm以下，且宜為100µm以下，亦較宜為60µm以下。第2薄膜6之厚度若在上述上限以下，便可抑制物體衝撞光學積層體1時之第2薄膜6之剝離。Specifically, the thickness of thesecond film 6 is, for example, 10 µm or more, preferably 20 µm or more, and more preferably 30 µm or more. If the thickness of thesecond film 6 is above the lower limit, the impact resistance of theoptical laminate 1 can be improved. In addition, the thickness of thesecond film 6 is, for example, 200 µm or less, preferably 100 µm or less, and more preferably 60 µm or less. If the thickness of thesecond film 6 is below the upper limit, the peeling of thesecond film 6 when an object collides with theoptical laminate 1 can be suppressed.

第2薄膜6之全光線透射率例如為80%以上，且宜為85%以上，又例如為99%以下。The total light transmittance of the secondthin film 6 is, for example, 80% or more, preferably 85% or more, and for example, 99% or less.

＜黏著劑層12＞ 光學積層體1亦可更具備假想線所示之黏著劑層12。黏著劑層12係配置於第1薄膜2之厚度方向另一面。具體而言，黏著劑層12係接觸第1薄膜2之厚度方向另一側。亦即，該光學積層體1往厚度方向一側依序具備：黏著劑層12、第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5及第2薄膜6。黏著劑層12係一不伴隨硬化反應而壓敏接著之黏著體。<Adhesive layer 12>Theoptical laminate 1 may also be provided with anadhesive layer 12 as shown by the imaginary line. Theadhesive layer 12 is disposed on the other side of thefirst film 2 in the thickness direction. Specifically, theadhesive layer 12 contacts the other side of thefirst film 2 in the thickness direction. That is, theoptical laminate 1 has, in order from one side in the thickness direction: theadhesive layer 12, thefirst film 2, the firstadhesive layer 3, theglass plate 4, the secondadhesive layer 5 and thesecond film 6. Theadhesive layer 12 is an adhesive body that is pressure-sensitively bonded without a curing reaction.

黏著劑層12之材料無限定。黏著劑層12之材料可舉例如丙烯酸系黏著劑、橡膠系黏著劑、乙烯基烷基醚系黏著劑、聚矽氧系黏著劑、聚酯系黏著劑、聚醯胺系黏著劑、胺甲酸酯系黏著劑、氟系黏著劑、環氧系黏著劑及聚醚系黏著劑。材料較佳可舉丙烯酸系黏著劑。黏著劑層12之處方及物性例如詳細記載於日本專利特開2018-28573號公報中。The material of theadhesive layer 12 is not limited. Examples of the material of theadhesive layer 12 include acrylic adhesives, rubber adhesives, vinyl alkyl ether adhesives, silicone adhesives, polyester adhesives, polyamide adhesives, urethane adhesives, fluorine adhesives, epoxy adhesives, and polyether adhesives. A preferred material is acrylic adhesive. The formulation and physical properties of theadhesive layer 12 are described in detail in Japanese Patent Publication No. 2018-28573.

黏著劑層12在25℃下之剪切儲存彈性模數G'例如為0.01MPa以上，又例如為0.20MPa以下。剪切儲存彈性模數G'可藉由頻率1Hz、升溫速度5℃/分鐘、剪切(扭轉)模式之動態黏彈性試驗求算。The shear storage modulus G' of theadhesive layer 12 at 25°C is, for example, not less than 0.01 MPa, and, for example, not more than 0.20 MPa. The shear storage modulus G' can be calculated by a dynamic viscoelastic test at a frequency of 1 Hz, a heating rate of 5°C/min, and a shear (torsion) mode.

黏著劑層12之厚度例如為5µm以上，且宜為5µm以上，又例如為50µm以下，且宜為30µm以下，較宜為20µm以下。The thickness of theadhesive layer 12 is, for example, greater than 5 µm, preferably greater than 5 µm, and is, for example, less than 50 µm, preferably less than 30 µm, and more preferably less than 20 µm.

光學積層體1之厚度例如為50µm以上，又例如為300µm以下以下。The thickness of theoptical laminate 1 is, for example, greater than 50 µm, and for example, less than 300 µm.

＜落筆破裂試驗＞ 光學積層體1中，在落筆破裂試驗中直至玻璃板4開始破裂為止之筆的落下高度H1為20cm以上。<Pen drop crack test>In theoptical laminate 1, the height H1 of the pen drop until theglass plate 4 starts to crack in the pen drop crack test is 20 cm or more.

首先，將光學積層體1隔著假想線所示樹脂薄膜34配置於水平台(未圖示)之表面。將厚度15µm之光學積層體1配置於玻璃板4之厚度方向一面。 此外，該黏著劑層12在落筆破裂試驗中兼作用以將光學積層體1固定於水平台之固定構件。藉由頻率1Hz、升溫速度5℃/分鐘、溫度-40℃~150℃、扭轉模式之動態黏彈性試驗求算之在25℃下之剪切儲存彈性模數G'為0.03MPa。First, theoptical laminate 1 is placed on the surface of a horizontal platform (not shown) through theresin film 34 shown by the imaginary line. Theoptical laminate 1 with a thickness of 15µm is placed on one side of theglass plate 4 in the thickness direction.In addition, theadhesive layer 12 also serves as a fixing member to fix theoptical laminate 1 to the horizontal platform in the pen-drop fracture test. The shear storage elastic modulus G' at 25°C calculated by the dynamic viscoelastic test with a frequency of 1Hz, a heating rate of 5°C/min, a temperature of -40°C~150°C, and a torsional mode is 0.03MPa.

如圖1所示，使筆29(Pentel原子筆 BK407黑，球珠徑0.7mm)朝第2薄膜6落下。筆29之質量為7g。從第2薄膜6至筆29之前端部32為止之高度為5cm。前端部32係朝下側尖凸。若未因筆29之上述落下而於玻璃板4發生破裂，便每次提高1cm高度。取得確認玻璃板4有破裂時之高度作為落筆破裂試驗中之高度H1。或者，在筆之落下高度30cm未確認玻璃板4有破裂時，判斷為具有30cm以上之抗剝落耐久性。As shown in FIG1 , a pen 29 (Pentel ballpoint pen BK407 black, ball diameter 0.7 mm) is dropped toward thesecond film 6. The mass of thepen 29 is 7 g. The height from thesecond film 6 to thefront end 32 of thepen 29 is 5 cm. Thefront end 32 is pointed downward. If theglass plate 4 does not break due to the above-mentioned drop of thepen 29, the height is raised by 1 cm each time. The height when theglass plate 4 is confirmed to be broken is obtained as the height H1 in the pen drop break test. Alternatively, when theglass plate 4 is not confirmed to be broken at a drop height of 30 cm, it is judged that theglass plate 4 has an anti-peeling durability of more than 30 cm.

另一方面，落筆破裂試驗中之落下高度H1若小於20cm，則光學積層體1之耐衝擊性低。On the other hand, if the drop height H1 in the pen-drop fracture test is less than 20 cm, the impact resistance of theoptical laminate 1 is low.

另一方面，落筆破裂試驗中之落下高度H1宜為25cm以上，較宜為30cm以上。On the other hand, the drop height H1 in the pen-drop fracture test is preferably 25 cm or more, more preferably 30 cm or more.

＜落筆剝落試驗＞ 光學積層體1中，在落筆剝落試驗中直至第2薄膜6開始剝落為止之筆29的落下高度H2為20cm以上。<Pen drop test>In theoptical laminate 1, the drop height H2 of thepen 29 until thesecond film 6 starts to peel off in the pen drop test is 20 cm or more.

落筆剝落試驗係與上述落筆破裂試驗並行實施。首先，將光學積層體1隔著假想線所示樹脂薄膜34配置於水平台(未圖示)之表面。於光學積層體1未配置有黏著劑層12時，係將與落筆破裂試驗中所用黏著劑層12相同之黏著劑層12配置於光學積層體1之厚度方向一面。The pen-drop peeling test is carried out in parallel with the pen-drop cracking test. First, theoptical laminate 1 is placed on the surface of a horizontal platform (not shown) via aresin film 34 shown by an imaginary line. When theoptical laminate 1 is not provided with anadhesive layer 12, anadhesive layer 12 identical to theadhesive layer 12 used in the pen-drop cracking test is placed on one side of theoptical laminate 1 in the thickness direction.

如圖1所示，使筆29(Pentel原子筆 BK407黑，球珠徑0.7mm)朝第2薄膜6落下。筆29之質量為7g。從玻璃板4至筆29之前端部32為止之高度為5cm。前端部32係朝下側尖凸。若未因筆29之上述落下而發生第1薄膜2從第1接著劑層3之剝落、玻璃板4從第1接著劑層3之剝落、玻璃板4從第2接著劑層5之剝落及第2薄膜6從第2接著劑層5之剝落，便每次提高1cm高度。取得確認有上述任一剝落時之高度作為落筆剝落試驗中之高度H2。或者，於確認玻璃板4有破裂時，判斷為具有破裂高度H1以上之抗剝落耐久性。或者，在筆之落下高度30cm未確認有上述剝落時，判斷為具有30cm以上之抗剝落耐久性。As shown in FIG1 , a pen 29 (Pentel ballpoint pen BK407 black, ball diameter 0.7 mm) is dropped toward thesecond film 6. The mass of thepen 29 is 7 g. The height from theglass plate 4 to thefront end 32 of thepen 29 is 5 cm. Thefront end 32 is pointed downward. If thefirst film 2 is not peeled off from the firstadhesive layer 3, theglass plate 4 is not peeled off from the firstadhesive layer 3, theglass plate 4 is not peeled off from the secondadhesive layer 5, and thesecond film 6 is not peeled off from the secondadhesive layer 5 due to the above-mentioned drop of thepen 29, the height is raised by 1 cm each time. The height when any of the above peeling is confirmed is obtained as the height H2 in the pen drop test. Alternatively, when cracks are confirmed on theglass plate 4, it is determined that theglass plate 4 has anti-peeling durability of crack height H1 or higher. Alternatively, when no peeling is confirmed when the pen is dropped at a height of 30 cm, it is determined that theglass plate 4 has anti-peeling durability of 30 cm or higher.

滿足上述要件之光學積層體1中，第1薄膜2對第1接著劑層3之密著力高，玻璃板4對第1接著劑層3之密著力高，第2接著劑層5對玻璃板4之密著力高，及第2薄膜6對第2接著劑層5之密著力高。因此，光學積層體1之可靠性優異。In theoptical laminate 1 satisfying the above requirements, thefirst film 2 has high adhesion to the firstadhesive layer 3, theglass plate 4 has high adhesion to the firstadhesive layer 3, the secondadhesive layer 5 has high adhesion to theglass plate 4, and thesecond film 6 has high adhesion to the secondadhesive layer 5. Therefore, theoptical laminate 1 has excellent reliability.

＜光學積層體1之製造方法＞ 說明光學積層體1之製造方法。光學積層體1之製造方法中，例如係於玻璃板4之厚度方向另一面及/或第1薄膜2之厚度方向一面配置(塗佈)硬化型接著劑，並以玻璃板4及第1薄膜2包夾上述硬化型接著劑。於玻璃板4之厚度方向一面及/或第2薄膜6之厚度方向另一面配置(塗佈)硬化型接著劑，並以玻璃板4及第2薄膜6包夾上述硬化型接著劑。<Manufacturing method ofoptical laminate 1>Description of the manufacturing method ofoptical laminate 1. In the manufacturing method ofoptical laminate 1, for example, a hardening adhesive is arranged (applied) on the other side of theglass plate 4 in the thickness direction and/or on one side of thefirst film 2 in the thickness direction, and the hardening adhesive is sandwiched between theglass plate 4 and thefirst film 2. A hardening adhesive is arranged (applied) on one side of theglass plate 4 in the thickness direction and/or on the other side of thesecond film 6 in the thickness direction, and the hardening adhesive is sandwiched between theglass plate 4 and thesecond film 6.

然後，使2個硬化型接著劑硬化。硬化型接著劑若為活性能量硬化型，便將包含紫外線之活性能量照射至硬化型接著劑。硬化型接著劑若為熱硬化型，則將硬化型接著劑加熱。藉此形成第1接著劑層3與第2接著劑層5。第1接著劑層3係用以將第1薄膜2及玻璃板4牢固固著。第2接著劑層5係用以將玻璃板4及第2薄膜6牢固接著。Then, the two curing adhesives are cured. If the curing adhesive is an active energy curing type, active energy including ultraviolet rays is irradiated to the curing adhesive. If the curing adhesive is a heat curing type, the curing adhesive is heated. Thus, the firstadhesive layer 3 and the secondadhesive layer 5 are formed. The firstadhesive layer 3 is used to firmly fix thefirst film 2 and theglass plate 4. The secondadhesive layer 5 is used to firmly bond theglass plate 4 and thesecond film 6.

藉此獲得具備第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5及第2薄膜6之光學積層體1。Thus, anoptical laminate 1 including thefirst film 2, the firstadhesive layer 3, theglass plate 4, the secondadhesive layer 5 and thesecond film 6 is obtained.

然後，欲於光學積層體1更具備黏著劑層12時，係於第1薄膜2之厚度方向另一面配置黏著劑層12。例如係將含黏著劑之清漆塗佈至第1薄膜2之厚度方向另一面並乾燥。或者，亦可將形成於未圖示之剝離片的黏著劑層12轉印至第1薄膜2之厚度方向另一面。藉此獲得具備黏著劑層12、第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5及第2薄膜6之光學積層體1。此外，亦可使未圖式之剝離片具備於光學積層體1中。此時，光學積層體1具備：未圖示之剝離片、黏著劑層12、第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5及第2薄膜6。Then, when theoptical laminate 1 is to be provided with anadhesive layer 12, theadhesive layer 12 is disposed on the other side of thefirst film 2 in the thickness direction. For example, a varnish containing an adhesive is applied to the other side of thefirst film 2 in the thickness direction and dried. Alternatively, theadhesive layer 12 formed on an unillustrated release sheet may be transferred to the other side of thefirst film 2 in the thickness direction. Thus, theoptical laminate 1 having theadhesive layer 12, thefirst film 2, the firstadhesive layer 3, theglass plate 4, the secondadhesive layer 5 and thesecond film 6 is obtained. In addition, an unillustrated release sheet may also be provided in theoptical laminate 1. At this time, theoptical laminate 1 includes: a release sheet (not shown), anadhesive layer 12, afirst film 2, a firstbonding agent layer 3, aglass plate 4, a secondbonding agent layer 5, and asecond film 6.

＜光學積層體1之用途＞ 光學積層體1可用於各種光學用途，例如可具備於影像顯示裝置中。作為影像顯示裝置可舉例如有機電致發光顯示裝置(以下有僅稱為「有機EL顯示裝置」之情形)。<Application ofoptical laminate 1>Theoptical laminate 1 can be used for various optical applications, for example, it can be used in an image display device. An example of an image display device is an organic electroluminescent display device (hereinafter referred to as "organic EL display device").

接著，參照圖3說明具備光學積層體1之有機EL顯示裝置10。Next, an organicEL display device 10 having anoptical multilayer body 1 will be described with reference to FIG. 3.

＜有機EL顯示裝置10＞ 有機EL顯示裝置10具有朝面方向延伸之平板形狀。有機EL顯示裝置10具備接下來進行說明之導電性薄膜13，故作為觸控面板型輸入顯示裝置發揮功能。有機EL顯示裝置10往表側依序具備：光學積層體1、導電性薄膜13、第2黏著劑層14及影像顯示構件15。此外，該有機EL顯示裝置10中，紙面上側為使用者之視辨側，其為表側(相當於圖1之厚度方向另一側)，而紙面下側為背側(相當於圖1之厚度方向一側)。<OrganicEL display device 10>The organicEL display device 10 has a flat plate shape extending in the surface direction. The organicEL display device 10 has aconductive film 13 to be described below, so it functions as a touch panel type input display device. The organicEL display device 10 has, in order from the surface side: anoptical laminate 1, aconductive film 13, a secondadhesive layer 14, and animage display component 15. In addition, in the organicEL display device 10, the upper side of the paper is the user's viewing side, which is the surface side (equivalent to the other side in the thickness direction of Figure 1), and the lower side of the paper is the back side (equivalent to one side in the thickness direction of Figure 1).

＜光學積層體1＞ 光學積層體1往表側(視辨側)依序具備：黏著劑層12、第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5及第2薄膜6。<Optical laminate 1>Theoptical laminate 1 has, in order from the front side (visual side), anadhesive layer 12, afirst film 2, a firstbonding agent layer 3, aglass plate 4, a secondbonding agent layer 5, and asecond film 6.

＜導電性薄膜13＞ 導電性薄膜13往背側依序具備導電層16與基材層17。<Conductive film 13>Theconductive film 13 has a conductive layer 16 and a base layer 17 in order from the back side.

＜導電層16＞ 導電層16具有預定圖案。導電層16之表面及側面係接觸黏著劑層12。導電層16之材料可舉例如金屬氧化物、導電性纖維(纖維)及金屬。金屬氧化物可舉複合氧化物。複合氧化物可舉例如銦鋅複合氧化物(IZO)、銦鎵鋅複合氧化物(IGZO)、銦鎵複合氧化物(IGO)、銦錫複合氧化物(ITO)及銻錫複合氧化物(ATO)。導電性纖維可舉例如金屬奈米線及奈米碳管。金屬可舉例如金、鉑、銀及銅。導電層16係一體地具有位於面方向中央部之感測器電極部18及位於感測器電極部18之周邊的導引配線部19。導電層16之詳細內容例如記載於日本專利特開2017-102443號公報、日本專利特開2014-113705號公報及日本專利特開2014-219667號公報中。<Conductive layer 16>The conductive layer 16 has a predetermined pattern. The surface and side of the conductive layer 16 are in contact with theadhesive layer 12. The material of the conductive layer 16 can be, for example, metal oxides, conductive fibers (fibers) and metals. The metal oxide can be a composite oxide. The composite oxide can be, for example, indium zinc composite oxide (IZO), indium gallium zinc composite oxide (IGZO), indium gallium composite oxide (IGO), indium tin composite oxide (ITO) and antimony tin composite oxide (ATO). The conductive fiber can be, for example, metal nanowires and carbon nanotubes. The metal can be, for example, gold, platinum, silver and copper. The conductive layer 16 integrally includes asensor electrode portion 18 located in the center of the surface direction and aguide wiring portion 19 located around thesensor electrode portion 18. The details of the conductive layer 16 are described in, for example, Japanese Patent Publication No. 2017-102443, Japanese Patent Publication No. 2014-113705, and Japanese Patent Publication No. 2014-219667.

＜基材層17＞ 基材層17係配置於導電層16之背面及黏著劑層12之背面。基材層17係朝面方向延伸。基材層17例如為樹脂層。基材層17之材料可舉烯烴樹脂、聚酯樹脂、(甲基)丙烯酸樹脂、聚碳酸酯樹脂、聚醚碸樹脂、聚芳酯樹脂、三聚氰胺樹脂、聚醯胺樹脂、聚醯亞胺樹脂、纖維素樹脂及聚苯乙烯樹脂。烯烴樹脂可舉例如聚乙烯、聚丙烯及環烯烴聚合物(COP)。聚酯樹脂可舉例如PET、PBT及PEN。(甲基)丙烯酸樹脂可舉例如聚(甲基)丙烯酸酯樹脂。基材層17之詳細內容例如記載於日本專利特開2018-181722號公報中。<Substrate layer 17>The substrate layer 17 is disposed on the back side of the conductive layer 16 and the back side of theadhesive layer 12. The substrate layer 17 extends in the surface direction. The substrate layer 17 is, for example, a resin layer. The material of the substrate layer 17 can be olefin resin, polyester resin, (meth) acrylic resin, polycarbonate resin, polyether resin, polyarylate resin, melamine resin, polyamide resin, polyimide resin, cellulose resin and polystyrene resin. Olefin resins can be, for example, polyethylene, polypropylene and cycloolefin polymer (COP). Polyester resins can be, for example, PET, PBT and PEN. The (meth) acrylic resin may be, for example, a poly (meth) acrylate resin. The details of the substrate layer 17 are described, for example, in Japanese Patent Publication No. 2018-181722.

＜第2黏著劑層14＞ 第2黏著劑層14係配置於導電性薄膜13之背面。具體而言，第2黏著劑層14係接觸導電性薄膜13之背面。第2黏著劑層14之材料與黏著劑層12之材料相同。<Secondadhesive layer 14>The secondadhesive layer 14 is disposed on the back side of theconductive film 13. Specifically, the secondadhesive layer 14 contacts the back side of theconductive film 13. The material of the secondadhesive layer 14 is the same as that of theadhesive layer 12.

＜影像顯示構件15＞ 影像顯示構件15係形成有機EL顯示裝置10之背面。影像顯示構件15係隔著第2黏著劑層14配置於導電性薄膜13之背側。影像顯示構件15係朝面方向延伸。影像顯示構件15具體而言為有機EL元件。例如，影像顯示構件15中雖未圖示，但包含顯示基板、2個電極、被2個電極包夾之有機EL層及密封層。此外，影像顯示構件15之構成及物性例如詳細記載於日本專利特開2018-28573號公報中。<Image display component 15>Theimage display component 15 forms the back of the organicEL display device 10. Theimage display component 15 is arranged on the back side of theconductive film 13 via the secondadhesive layer 14. Theimage display component 15 extends in the surface direction. Specifically, theimage display component 15 is an organic EL element. For example, although not shown in the figure, theimage display component 15 includes a display substrate, two electrodes, an organic EL layer sandwiched by the two electrodes, and a sealing layer. In addition, the composition and physical properties of theimage display component 15 are described in detail in, for example, Japanese Patent Publication No. 2018-28573.

＜一實施形態之作用效果＞ 一實施形態之光學積層體1為第2薄膜6配置於玻璃板4之視辨側且第1薄膜2配置於玻璃板4之對側之新穎的構成。而該光學積層體1中，在落筆破裂試驗中直至玻璃板4開始破裂為止之筆的落下高度H1為20cm以上。因此，光學積層體1之耐衝擊性優異。<Effects of an Implementation Form>Anoptical laminate 1 of an implementation form has a novel structure in which thesecond film 6 is arranged on the viewing side of theglass plate 4 and thefirst film 2 is arranged on the opposite side of theglass plate 4. In theoptical laminate 1, the drop height H1 of the pen until theglass plate 4 begins to break in the pen drop fracture test is more than 20 cm. Therefore, theoptical laminate 1 has excellent impact resistance.

又，該光學積層體1中，較佳為在落筆剝落試驗中，直至第1薄膜2或第2薄膜6開始剝落為止之筆的落下高度H2為20cm以上。因此，光學積層體1之可靠性優異。In theoptical laminate 1, the height H2 of the pen drop until thefirst film 2 or thesecond film 6 starts to peel off in the pen drop test is preferably 20 cm or more. Therefore, theoptical laminate 1 has excellent reliability.

又，該光學積層體1中，第1薄膜2在-100℃至-50℃下之tanδ的平均值相對於第2薄膜6在-100℃至-50℃下之tanδ的平均值之比若在0.8以上且1.5以下，便可縮小第1薄膜2與第2薄膜6之衝擊吸收行為的差。因此，可抑制第1薄膜2或第2薄膜6之剝落。結果，光學積層體1之可靠性優異。Furthermore, in theoptical laminate 1, if the ratio of the average value of tanδ of thefirst film 2 at -100°C to -50°C to the average value of tanδ of thesecond film 6 at -100°C to -50°C is 0.8 or more and 1.5 or less, the difference in impact absorption behavior between thefirst film 2 and thesecond film 6 can be reduced. Therefore, the peeling of thefirst film 2 or thesecond film 6 can be suppressed. As a result, the reliability of theoptical laminate 1 is excellent.

又，該光學積層體1中，第1薄膜2在-100℃至-50℃下之tanδ的平均值若為0.04以上，且第1薄膜2藉由動態黏彈性試驗求算之在-100℃至-50℃下之拉伸儲存彈性模數E'的平均值若在3GPa以上且6GPa以下，便可抑制玻璃板4在落筆破裂試驗中破裂。因此，光學積層體1之耐衝擊性優異。Furthermore, in theoptical laminate 1, if the average value of tanδ of thefirst film 2 at -100°C to -50°C is 0.04 or more, and if the average value of the tensile storage elastic modulus E' of thefirst film 2 at -100°C to -50°C calculated by the dynamic viscoelastic test is 3 GPa or more and 6 GPa or less, theglass plate 4 can be prevented from cracking in the pen-drop cracking test. Therefore, theoptical laminate 1 has excellent impact resistance.

又，該光學積層體1中，第1薄膜2與第1接著劑層3之密著力若為3.0kN/m以上，第1接著劑層3與玻璃板4之密著力若為3.0kN/m以上，玻璃板4與第2接著劑層5之密著力若為3.0kN/m以上，且第2接著劑層5與第2薄膜6之密著力若為3.0kN/m以上，第1薄膜2對玻璃板4之密著力及第2薄膜6對玻璃板4之密著力便優異。因此，光學積層體1之可靠性優異。Furthermore, in theoptical laminate 1, if the adhesion between thefirst film 2 and the firstadhesive layer 3 is 3.0 kN/m or more, if the adhesion between the firstadhesive layer 3 and theglass plate 4 is 3.0 kN/m or more, if the adhesion between theglass plate 4 and the secondadhesive layer 5 is 3.0 kN/m or more, and if the adhesion between the secondadhesive layer 5 and thesecond film 6 is 3.0 kN/m or more, the adhesion between thefirst film 2 and theglass plate 4 and the adhesion between thesecond film 6 and theglass plate 4 are excellent. Therefore, the reliability of theoptical laminate 1 is excellent.

又，該光學積層體1中，第1薄膜2與第2薄膜6分別若為TAC薄膜，第1薄膜2對第1接著劑層3之密著力及第2薄膜6對第2接著劑層5之密著力便優異。因此，光學積層體1之可靠性優異。Furthermore, in theoptical laminate 1, if thefirst film 2 and thesecond film 6 are TAC films, thefirst film 2 has excellent adhesion to the firstadhesive layer 3 and thesecond film 6 has excellent adhesion to the secondadhesive layer 5. Therefore, theoptical laminate 1 has excellent reliability.

又，第2薄膜6若較第1薄膜2更厚，則可縮小第1薄膜2對於第2薄膜6之衝擊吸收行為之阻力，結果可抑制第1薄膜2或第2薄膜6之剝落。因此，光學積層體1之可靠性優異。Furthermore, if thesecond film 6 is thicker than thefirst film 2, the resistance of thefirst film 2 to the impact absorption behavior of thesecond film 6 can be reduced, and as a result, the peeling of thefirst film 2 or thesecond film 6 can be suppressed. Therefore, the reliability of theoptical laminate 1 is excellent.

＜變形例＞ 以下變形例中，關於與上述一實施形態相同之構件及步驟係賦予相同的參照符號，並省略其詳細說明。又，變形例除特別註記外，係可發揮與一實施形態相同之作用效果。<Variations>In the following variations, the same components and steps as those in the above-mentioned first embodiment are given the same reference symbols, and their detailed descriptions are omitted. In addition, unless otherwise noted, the variations can exert the same effects as those in the first embodiment.

在一實施形態中，第1薄膜2為單層，惟第1薄膜2之層數無限定。第1薄膜2亦可為複數層。In one embodiment, thefirst film 2 is a single layer, but the number of layers of thefirst film 2 is not limited. Thefirst film 2 may also be a plurality of layers.

在一實施形態中，第2薄膜6為單層，惟第2薄膜6之層數無限定。第2薄膜6亦可為複數層。In one embodiment, thesecond film 6 is a single layer, but the number of layers of thesecond film 6 is not limited. Thesecond film 6 may also be a plurality of layers.

如圖1之點劃線所示，光學積層體1亦可更具備硬塗層38。硬塗層38係配置於第2薄膜6之厚度方向一面。硬塗層38係接觸第2薄膜6之厚度方向一面。光學積層體1往視辨側依序具備：第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5、第2薄膜6及硬塗層38。硬塗層38之處方、物性及尺寸無特別限定。在該變形例中，光學積層體1具備硬塗層38，因此可提升光學積層體1之耐衝擊性及耐擦傷性。As shown by the dotted line in FIG. 1 , theoptical laminate 1 may also be further provided with ahard coating layer 38. Thehard coating layer 38 is disposed on one side of thesecond film 6 in the thickness direction. Thehard coating layer 38 contacts one side of thesecond film 6 in the thickness direction. Theoptical laminate 1 comprises, in order from the viewing side: afirst film 2, a firstadhesive layer 3, aglass plate 4, a secondadhesive layer 5, asecond film 6, and ahard coating layer 38. The formulation, physical properties, and dimensions of thehard coating layer 38 are not particularly limited. In this variant, theoptical laminate 1 is provided with thehard coating layer 38, thereby improving the impact resistance and scratch resistance of theoptical laminate 1.

可取代硬塗層38，或可更具備其他機能層。其他機能層可舉例如防飛散層、防污層及抗反射層。該等可為單層亦可積層複數層。Thehard coating layer 38 may be replaced or provided with other functional layers. Other functional layers may include, for example, an anti-scattering layer, an anti-fouling layer, and an anti-reflection layer. These may be a single layer or a plurality of layers.

本發明光學積層體之耐衝擊性優異，因此即使為厚度小於40µm之玻璃板亦具有充分之耐衝擊性。厚度小於40µm之玻璃板之撓曲性優異，因此本發明光學積層體亦可適宜用於折疊式顯示器及卷軸式(rollable)顯示器等撓性顯示器。The optical multilayer of the present invention has excellent impact resistance, so even a glass plate with a thickness of less than 40µm has sufficient impact resistance. The glass plate with a thickness of less than 40µm has excellent flexibility, so the optical multilayer of the present invention can also be suitably used in flexible displays such as foldable displays and rollable displays.

實施例 以下記載所用摻混比率(含有比率)、物性值、參數等具體數值，可替代成上述「用以實施發明之形態」中記載之與其等對應之摻混比率(含有比率)、物性值、參數等該記載之上限值(「以下」、「小於」所定義之數值)或下限值(「以上」、「大於」所定義之數值)。又，以下記載中只要未特別言及，「份」及「%」即為質量基準。ExamplesThe specific numerical values of the blending ratio (content ratio), physical property values, parameters, etc. used in the following description can be replaced by the upper limit value (the value defined as "below" or "less than") or lower limit value (the value defined as "above" or "greater than") of the blending ratio (content ratio), physical property values, parameters, etc. corresponding to the above-mentioned "form for implementing the invention". In addition, unless otherwise specified in the following description, "parts" and "%" are the mass standards.

在以下的實施例及比較例中，係製造光學積層體1，接著於光學積層體1配置黏著劑層12後，評估光學積層體1之耐衝擊性及耐剝落性。In the following embodiments and comparative examples, anoptical laminate 1 is manufactured, and then anadhesive layer 12 is disposed on theoptical laminate 1 to evaluate the impact resistance and peeling resistance of theoptical laminate 1.

實施例1 準備厚度30µm之玻璃板4(G-leaf)、由厚度25µm之聚對苯二甲酸乙二酯薄膜構成之第1薄膜2(DIAFOIL S100 Chemical Co.，Mitsubishi製)、及由厚度40µm之三醋酸纖維素薄膜(KC4UYW，Konica Minolta製)構成之第2薄膜6。又，摻混脂肪族脂環式環氧樹脂(CELLOXIDE 2021P，環氧當量128~133g/eq.，Daicel化學公司製)70質量份、3官能脂肪族環氧樹脂(EHPE3150，環氧當量170~190g/eq.，Daicel化學公司製)5質量份、氧雜環丁烷系樹脂(ARON OXETANE，東亞合成公司製)19質量份、矽烷耦合劑(KBM-403，3-環氧丙氧基丙基三甲氧基矽烷，信越化學工業公司製)4質量份、光酸產生劑(CPI101A，三芳基鋶鹽，San San-Apro公司製)2質量份，而調製出環氧接著劑組成物(硬化型接著劑)。以玻璃板4與第1薄膜2包夾該環氧接著劑組成物。又，以玻璃板4與第2薄膜6包夾環氧接著劑組成物。以玻璃板4與第2薄膜6包夾經塗佈於玻璃板4之一面的丙烯酸接著劑組成物。以玻璃板4與第2薄膜2包夾經塗佈於玻璃板4之另一面的丙烯酸接著劑組成物。Example 1A glass plate 4 (G-leaf) having a thickness of 30µm, afirst film 2 composed of a polyethylene terephthalate film having a thickness of 25µm (DIAFOIL S100 Chemical Co., manufactured by Mitsubishi), and asecond film 6 composed of a cellulose triacetate film having a thickness of 40µm (KC4UYW, manufactured by Konica Minolta) were prepared. In addition, 70 parts by weight of an aliphatic epoxy resin (CELLOXIDE 2021P, epoxy equivalent 128-133 g/eq., manufactured by Daicel Chemical Co., Ltd.), 5 parts by weight of a trifunctional aliphatic epoxy resin (EHPE3150, epoxy equivalent 170-190 g/eq., manufactured by Daicel Chemical Co., Ltd.), 19 parts by weight of an oxycyclobutane resin (ARON OXETANE, manufactured by Toagosei Co., Ltd.), 4 parts by weight of a silane coupling agent (KBM-403, 3-glycidoxypropyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd.), and a photoacid generator (CPI101A, triaryl iron salt,San 2 parts by mass of 1% acrylate (made by San-Apro) to prepare an epoxy adhesive composition (hardening adhesive). The epoxy adhesive composition is sandwiched between theglass plate 4 and thefirst film 2. The epoxy adhesive composition is sandwiched between theglass plate 4 and thesecond film 6. The acrylic adhesive composition applied to one side of theglass plate 4 is sandwiched between theglass plate 4 and thesecond film 6. The acrylic adhesive composition applied to the other side of theglass plate 4 is sandwiched between theglass plate 4 and thesecond film 2.

然後，將紫外線照射至2個硬化型接著劑。藉此形成厚度1µm之第1接著劑層3與厚度1µm之第2接著劑層5。第1接著劑層3係由用以將第1薄膜2及玻璃板4牢固接著之硬化物構成。第1接著劑層3利用奈米壓痕儀法測定之在25℃下之彈性模數為4.9GPa。第2接著劑層5係由用以將第2薄膜6及玻璃板4牢固接著之硬化物構成。第2接著劑層5利用奈米壓痕儀法測定之在25℃下之彈性模數為4.9GPa。Then, ultraviolet rays are irradiated to the two curing adhesives. Thus, a firstadhesive layer 3 with a thickness of 1µm and a secondadhesive layer 5 with a thickness of 1µm are formed. The firstadhesive layer 3 is composed of a hardened material for firmly bonding thefirst film 2 and theglass plate 4. The elastic modulus of the firstadhesive layer 3 at 25°C measured by the nanoindenter method is 4.9GPa. The secondadhesive layer 5 is composed of a hardened material for firmly bonding thesecond film 6 and theglass plate 4. The elastic modulus of the secondadhesive layer 5 at 25°C measured by the nanoindenter method is 4.9GPa.

藉此製造出往厚度方向一側依序具備第1薄膜2、第1接著劑層3、玻璃板4、第2接著劑層5及第2薄膜6之光學積層體1。Thus, anoptical laminate 1 is manufactured, which has thefirst film 2, the firstadhesive layer 3, theglass plate 4, the secondadhesive layer 5 and thesecond film 6 in sequence on one side in the thickness direction.

接著，將厚度15µm之黏著劑層12藉由轉印配置於第1薄膜2之厚度方向另一面。黏著劑層12係如下述進行調製。Next, anadhesive layer 12 having a thickness of 15 μm is placed on the other side of thefirst film 2 in the thickness direction by transfer printing. Theadhesive layer 12 is prepared as follows.

摻混丙烯酸月桂酯(LA)43質量份、丙烯酸2-乙基己酯(2EHA)44質量份、丙烯酸4-羥丁酯(4HBA)6質量份、N-乙烯基-2-吡咯啶酮(NVP)7質量份及BASF製「IRGACURE 184」0.015質量份，並照射紫外線進行聚合，而獲得基底聚合物組成物(聚合率：約10%)。43 parts by mass of lauryl acrylate (LA), 44 parts by mass of 2-ethylhexyl acrylate (2EHA), 6 parts by mass of 4-hydroxybutyl acrylate (4HBA), 7 parts by mass of N-vinyl-2-pyrrolidone (NVP) and 0.015 parts by mass of "IRGACURE 184" manufactured by BASF were mixed and polymerized by irradiation with ultraviolet light to obtain a base polymer composition (polymerization rate: about 10%).

另外，混合甲基丙烯酸二環戊酯(DCPMA)60質量份、甲基丙烯酸甲酯(MMA)40質量份、α-硫甘油3.5質量份及甲苯100質量份，並在氮氣環境下在70℃下攪拌1小時。接著，投入2,2'-偶氮雙異丁腈(AIBN)0.2質量份，並在70℃下反應2小時後，升溫至80℃，使其反應2小時。之後，將反應液加熱至130℃，並將甲苯、鏈轉移劑及未反應單體乾燥去除而獲得固態丙烯酸系寡聚物。丙烯酸系寡聚物之重量平均分子量為5100。玻璃轉移溫度(Tg)為130℃。In addition, 60 parts by mass of dicyclopentyl methacrylate (DCPMA), 40 parts by mass of methyl methacrylate (MMA), 3.5 parts by mass of α-thioglycerol and 100 parts by mass of toluene were mixed and stirred at 70°C for 1 hour in a nitrogen atmosphere. Then, 0.2 parts by mass of 2,2'-azobisisobutyronitrile (AIBN) was added and reacted at 70°C for 2 hours, then the temperature was raised to 80°C and allowed to react for 2 hours. Thereafter, the reaction solution was heated to 130°C, and toluene, chain transfer agent and unreacted monomers were dried and removed to obtain a solid acrylic oligomer. The weight average molecular weight of the acrylic oligomer was 5100. The glass transition temperature (Tg) was 130°C.

相對於基底聚合物組成物之固體成分100質量份，添加1,6-己二醇二丙烯酸酯(HDDA)0.07質量份、丙烯酸系寡聚物1質量份、矽烷耦合劑(信越化學製「KBM403」)0.3質量份後，將該等均勻混合，而調製出黏著劑組成物。To 100 parts by mass of the solid content of the base polymer composition, 0.07 parts by mass of 1,6-hexanediol diacrylate (HDDA), 1 part by mass of an acrylic oligomer, and 0.3 parts by mass of a silane coupling agent ("KBM403" manufactured by Shin-Etsu Chemical) were added and uniformly mixed to prepare an adhesive composition.

將黏著劑組成物塗佈於由PET薄膜(Mitsubishi Chemical Co.製「DIAFOIL MRF75」)構成之剝離片表面，然後將由另一PET薄膜(Mitsubishi Chemical Co.製「DIAFOIL MRF75」)構成之剝離片貼合至塗膜上。之後，對塗膜照射紫外線，而調製出厚度15µm之黏著劑層12。該黏著劑層12在25℃下之剪切儲存彈性模數G'為0.03MPa。測定方法如下。 將黏著劑層12進行外形加工成圓盤狀，並以平行板包夾，再使用Rheometric Scientific公司製「Advanced Rheometric Expansion System(ARES)」，藉由以下條件之動態黏彈性測定，求出黏著劑層12在25℃下之剪切儲存彈性模數G'。The adhesive composition was applied to the surface of a peeling sheet made of a PET film ("DIAFOIL MRF75" manufactured by Mitsubishi Chemical Co.), and then a peeling sheet made of another PET film ("DIAFOIL MRF75" manufactured by Mitsubishi Chemical Co.) was attached to the coating. After that, the coating was irradiated with ultraviolet rays to prepare anadhesive layer 12 with a thickness of 15µm. The shear storage modulus G' of theadhesive layer 12 at 25°C was 0.03MPa. The measurement method is as follows.Theadhesive layer 12 is processed into a disc shape and sandwiched with parallel plates. Then, the "Advanced Rheometric Expansion System (ARES)" manufactured by Rheometric Scientific is used to measure the dynamic viscoelasticity under the following conditions to obtain the shear storage elastic modulus G' of theadhesive layer 12 at 25°C.

[條件] 模式：扭轉 溫度：-40℃至150℃ 升溫速度：5℃/分鐘 頻率：1Hz[Conditions]Mode: TwistTemperature: -40℃ to 150℃Heating speed: 5℃/minFrequency: 1Hz

實施例2 依與實施例1相同方式而製作出光學積層體1。惟，將第1薄膜2之厚度變更成50µm。Example 2Anoptical laminate 1 is manufactured in the same manner as Example 1. However, the thickness of thefirst film 2 is changed to 50µm.

實施例3 依與實施例2相同方式而製作出光學積層體1。惟，將第2薄膜6變更成厚度20µm之三醋酸纖維素薄膜(KC2CT，Konica Minolta製)。Example 3Anoptical laminate 1 is produced in the same manner as in Example 2. However, thesecond film 6 is replaced with a cellulose triacetate film (KC2CT, manufactured by Konica Minolta) with a thickness of 20µm.

實施例4 依與實施例1相同方式而製作出光學積層體1。惟，將第2薄膜6變更成厚度20µm之三醋酸纖維素薄膜(KC2CT，Konica Minolta製)。Example 4Anoptical laminate 1 is produced in the same manner as in Example 1. However, thesecond film 6 is changed to a cellulose triacetate film (KC2CT, manufactured by Konica Minolta) with a thickness of 20µm.

實施例5 依與實施例3相同方式而製作出光學積層體1。惟，將第1薄膜2變更成厚度40µm之三醋酸纖維素薄膜(KC4UYW，Konica Minolta製)。Example 5Anoptical laminate 1 is produced in the same manner as in Example 3. However, thefirst film 2 is replaced with a cellulose triacetate film (KC4UYW, manufactured by Konica Minolta) with a thickness of 40µm.

實施例6 依與實施例1相同方式而製作出光學積層體1。惟，將第1薄膜2變更成厚度20µm之三醋酸纖維素薄膜(KC2CT，Konica Minolta製)。Example 6Anoptical laminate 1 is produced in the same manner as in Example 1. However, thefirst film 2 is changed to a cellulose triacetate film (KC2CT, manufactured by Konica Minolta) with a thickness of 20µm.

實施例7 依與實施例5相同方式而製作出光學積層體1。惟，將第1薄膜2變更成厚度20µm之三醋酸纖維素薄膜(KC2CT，Konica Minolta製)。Example 7Anoptical laminate 1 is produced in the same manner as in Example 5. However, thefirst film 2 is replaced with a cellulose triacetate film (KC2CT, manufactured by Konica Minolta) with a thickness of 20µm.

比較例1 依與實施例3相同方式而製作出光學積層體1。惟，第1薄膜2與第1接著劑層3不具備於光學積層體1中。該光學積層體1具備玻璃板4、第2接著劑層5及第2薄膜6。Comparative Example 1Anoptical laminate 1 is manufactured in the same manner as in Example 3. However, thefirst film 2 and the firstadhesive layer 3 are not included in theoptical laminate 1. Theoptical laminate 1 includes aglass plate 4, a secondadhesive layer 5, and asecond film 6.

比較例2 依與實施例5相同方式而製作出光學積層體1。惟，第2接著劑層5與第2薄膜6不具備於光學積層體1中。該光學積層體1具備第1薄膜2、第1接著劑層3及玻璃板4。Comparative Example 2Anoptical laminate 1 is manufactured in the same manner as in Example 5. However, the secondadhesive layer 5 and thesecond film 6 are not included in theoptical laminate 1. Theoptical laminate 1 includes afirst film 2, a firstadhesive layer 3 and aglass plate 4.

於表1中記載各實施例及比較例中之第1薄膜2與第2薄膜6的種類及厚度。Table 1 lists the types and thicknesses of thefirst film 2 and thesecond film 6 in each embodiment and comparative example.

＜評估＞ 針對各實施例及比較例，測定及評估了下述事項。將該等結果記載於表1。<Evaluation>The following items were measured and evaluated for each embodiment and comparative example. The results are shown in Table 1.

＜第1薄膜2及第2薄膜6之tanδ及拉伸儲存彈性模數E'＞ 將各實施例及比較例所準備之第1薄膜2及第2薄膜6供於動態黏彈性試驗。將裝置及條件記載於下。<Tanδ and tensile storage elastic modulus E' of thefirst film 2 and thesecond film 6>Thefirst film 2 and thesecond film 6 prepared in each embodiment and comparative example were subjected to a dynamic viscoelastic test. The apparatus and conditions are described below.

裝置：Hitachi High-Tech Science Co.製 多官能動態黏彈性測定裝置 DMS6100 溫度範圍：-100~200℃ 升溫速度：2℃/分鐘 模式：拉伸 試樣寬度：10mm 夾具間距離：20mm 頻率：10Hz 應變振幅：10µm 氣體環境：大氣(250ml/分鐘) 數據之取得間隔：0.5分鐘(每1℃)Equipment: Multifunctional dynamic viscoelasticity tester DMS6100 manufactured by Hitachi High-Tech Science Co.Temperature range: -100~200℃Heating rate: 2℃/minMode: TensileSample width: 10mmDistance between fixtures: 20mmFrequency: 10HzStrain amplitude: 10µmGas environment: Atmosphere (250ml/min)Data acquisition interval: 0.5 minutes (every 1℃)

第1薄膜2在-100℃至-50℃下之拉伸儲存彈性模數E'的平均值係分別將上述取得之在-100℃至-50℃下之所有數據的總和除以數據之數量而算出。第1薄膜2在-100℃至-50℃下之tanδ的平均值係分別將上述取得之在-100℃至-50℃下之所有數據的總和除以數據之數量而算出。針對第2薄膜6之tanδ的平均值亦以與上述相同方式算出。The average value of the tensile storage elastic modulus E' of thefirst film 2 at -100°C to -50°C is calculated by dividing the sum of all the data obtained at -100°C to -50°C by the number of data. The average value of tanδ of thefirst film 2 at -100°C to -50°C is calculated by dividing the sum of all the data obtained at -100°C to -50°C by the number of data. The average value of tanδ of thesecond film 6 is also calculated in the same manner as above.

＜第1薄膜2與第1接著劑層3之密著力、及第2薄膜6與第2接著劑層5之密著力＞ 使用表面、界面物性解析裝置，藉由以下裝置、條件及方法測定第1薄膜2與第1接著劑層3之密著力。<Adhesion between thefirst film 2 and the firstadhesive layer 3, and adhesion between thesecond film 6 and the secondadhesive layer 5>The adhesion between thefirst film 2 and the firstadhesive layer 3 was measured using the following device, conditions and method using a surface and interface physical property analysis device.

裝置：DAIPLA WINTES CO.,LTD.製 表面、界面物性解析裝置(SAICAS DN-20型)Equipment: DAIPLA WINTES CO., LTD. surface and interface property analysis equipment (SAICAS DN-20 model)

刀42之材料：單晶鑽石 刀尖43之寬度：1mm 刀尖43之前傾角：10°Material of blade 42: single crystal diamondWidth of blade tip 43: 1mmAngle of blade tip 43: 10°

表面、界面物性解析裝置41如圖2A所示，具備刀42與未圖示之移動裝置及壓力測定部。刀42可移動。刀42具備形成為前端部之刀尖43。As shown in FIG2A, the surface and interfaceproperty analysis device 41 includes aknife 42, a moving device (not shown), and a pressure measuring unit. Theknife 42 is movable. Theknife 42 includes aknife tip 43 formed as a front end.

如圖2A所示，將光學積層體1設置於測定裝置41上。As shown in FIG. 2A , theoptical multilayer body 1 is placed on a measuringdevice 41.

使刀尖43移動至水平方向(相當於光學積層體1之面方向)斜向厚度方向一側。水平方向速度為10µm/秒，鉛直方向速度為0.5µm/秒。 藉此，刀尖43便切入第1薄膜2。Move theknife tip 43 to the horizontal direction (equivalent to the surface direction of the optical laminate 1) obliquely to the thickness direction. The horizontal speed is 10µm/sec, and the vertical speed is 0.5µm/sec.Thereby, theknife tip 43 cuts into thefirst film 2.

如圖2B所示，當刀尖43達至第1薄膜2與第1接著劑層3之界面時，便使刀尖43僅於水平方向上移動。水平方向速度為10µm/秒之狀態。藉由刀尖43之水平方向之移動，第1薄膜2便從第1接著劑層3剝離。測定此時之剝離強度作為第1薄膜2與3之密著力。As shown in FIG2B , when theknife tip 43 reaches the interface between thefirst film 2 and the firstadhesive layer 3, theknife tip 43 is moved only in the horizontal direction. The horizontal speed is 10 μm/second. By the horizontal movement of theknife tip 43, thefirst film 2 is peeled off from the firstadhesive layer 3. The peeling strength at this time is measured as the adhesion between thefirst film 2 and 3.

第2薄膜6與第2接著劑層5之密著力係以與上述相同方式求得。The adhesion between thesecond film 6 and the secondadhesive layer 5 is obtained in the same manner as described above.

＜第1接著劑層3與玻璃板4之密著力、及玻璃板4與第2接著劑層5之密著力＞ 藉由與上述相同之裝置、條件及方法測定第1接著劑層3與玻璃板4之密著力。惟，如圖2C所示，刀尖43切入第1薄膜2後，亦會切入第1接著劑層3，而在刀尖43達至第1接著劑層3與玻璃板4之界面時，使刀尖43水平移動。藉此，第1接著劑層3便從玻璃板4剝離。測定此時之剝離強度作為第1接著劑層3與玻璃板4之密著力。第1接著劑層3與玻璃板4之密著力為4.5kN/m。<Adhesion between the firstadhesive layer 3 and theglass plate 4, and adhesion between theglass plate 4 and the secondadhesive layer 5>The adhesion between the firstadhesive layer 3 and theglass plate 4 was measured by the same apparatus, conditions and method as above. However, as shown in FIG2C, after theknife tip 43 cuts into thefirst film 2, it also cuts into the firstadhesive layer 3, and when theknife tip 43 reaches the interface between the firstadhesive layer 3 and theglass plate 4, theknife tip 43 is moved horizontally. As a result, the firstadhesive layer 3 is peeled off from theglass plate 4. The peeling strength at this time is measured as the adhesion between the firstadhesive layer 3 and theglass plate 4. The adhesion between the firstadhesive layer 3 and theglass plate 4 is 4.5 kN/m.

以與上述相同方式求得玻璃板4與第2接著劑層5之密著力。玻璃板4與第2接著劑層5之密著力為4.5kN/m。The adhesion between theglass plate 4 and the secondadhesive layer 5 was obtained in the same manner as above. The adhesion between theglass plate 4 and the secondadhesive layer 5 was 4.5 kN/m.

＜落筆破裂試驗＞ 針對各實施例及比較例之光學積層體1實施了下述落筆破裂試驗。首先，如圖1所示，以第2薄膜6朝上側之方式將光學積層體1置於樹脂薄膜34(假想線)之表面。具體而言，係將黏著劑層12貼附於樹脂薄膜34之表面。樹脂薄膜34係感壓薄膜(FUJIFILM製，Prescale MS中壓用單面型，厚度95µm)。樹脂薄膜34係配置於未圖示之水平台的表面上。接著，實施從距離第2薄膜6為5cm之高度使7g且球珠徑0.7mm之原子筆29落下之落筆破裂試驗。上述高度5cm係第2薄膜6之厚度方向一面與筆29之前端部32之距離。前端部32係朝下側尖凸。該光學積層體1中，若因筆29之上述落下而於玻璃板4發生破裂時，則落筆破裂試驗之高度H1為5cm。若玻璃板4未發生破裂，便每次提高1cm高度。藉此，可獲得玻璃板4發生破裂時之高度H1。<Pen drop cracking test> The following pen drop cracking test was performed on theoptical laminate 1 of each embodiment and comparative example. First, as shown in FIG1 , theoptical laminate 1 was placed on the surface of the resin film 34 (imaginary line) with thesecond film 6 facing upward. Specifically, theadhesive layer 12 was attached to the surface of theresin film 34. Theresin film 34 is a pressure-sensitive film (manufactured by FUJIFILM, Prescale MS medium pressure single-sided type, thickness 95µm). Theresin film 34 was arranged on the surface of a horizontal platform not shown in the figure. Next, a pen drop cracking test was performed by dropping a7g ballpoint pen 29 with a ball diameter of 0.7mm from a height of 5cm from thesecond film 6. The above-mentioned height of 5cm is the distance between one side of the thickness direction of thesecond film 6 and thefront end 32 of thepen 29. Thefront end 32 is pointed downward. In theoptical laminate 1, if theglass plate 4 is broken due to the above-mentioned drop of thepen 29, the height H1 of the pen drop break test is 5cm. If theglass plate 4 is not broken, the height is increased by 1cm each time. In this way, the height H1 when theglass plate 4 is broken can be obtained.

＜落筆剝落試驗＞ 依與上述落筆破裂試驗相同方式，使筆29落下至第2薄膜6。將最初之落下高度設定為5cm。之後，若未發生第2薄膜6從第2接著劑層5之剝落、玻璃板4從第2接著劑層5之剝落、玻璃板4從第1接著劑層3之剝落或第1薄膜2從第1接著劑層3之剝落，便每次提高1cm高度。取得確認有上述剝落時之高度作為落筆剝落試驗中之高度H2。或者，於確認玻璃板4板有破裂時，具有破裂高度H1以上之抗剝落耐久性。或者，在筆29之落下高度30cm仍未確認有上述剝落時，判斷為「具有30cm以上之抗剝落耐久性」。<Pen drop test>In the same manner as the above-mentioned pen drop crack test, thepen 29 is dropped onto thesecond film 6. The initial drop height is set to 5 cm. Thereafter, if there is no peeling of thesecond film 6 from the secondadhesive layer 5, theglass plate 4 from the secondadhesive layer 5, theglass plate 4 from the firstadhesive layer 3, or thefirst film 2 from the firstadhesive layer 3, the height is raised by 1 cm each time. The height when the above-mentioned peeling is confirmed is taken as the height H2 in the pen drop test. Alternatively, when it is confirmed that theglass plate 4 is cracked, the anti-peeling durability is above the crack height H1. Alternatively, if thepen 29 is not confirmed to have peeled off after being dropped from a height of 30 cm, it is judged to have "anti-peeling durability of more than 30 cm".

[表1][Table 1]

另，上述發明雖提供作為本發明例示之實施形態，但僅為例示，不得作限定解釋。該技術領域之熟知此項技藝之人士明瞭可知本發明變形例包含於後述申請專利範圍中。In addition, although the above invention is provided as an exemplary embodiment of the present invention, it is only for illustration and shall not be interpreted as limiting. A person familiar with the art in the technical field will clearly know that the variations of the present invention are included in the scope of the patent application described below.

產業上之可利用性 光學積層體可具備於影像顯示裝置中。Industrial ApplicabilityThe optical multilayer body can be used in image display devices.

1:光學積層體 2:第1薄膜 3:第1接著劑層 4:玻璃板 5:第2接著劑層 6:第2薄膜 10:有機EL顯示裝置 12:黏著劑層 13:導電性薄膜 14:第2黏著劑層 15:影像顯示構件 16:導電層 17:基材層 18:感測器電極部 19:導引配線部 29:筆 32:前端部 34:樹脂薄膜 38:硬塗層 41:表面、界面物性解析裝置(測定裝置) 42:刀 43:刀尖1: Optical laminate2: First film3: First adhesive layer4: Glass plate5: Second adhesive layer6: Second film10: Organic EL display device12: Adhesive layer13: Conductive film14: Second adhesive layer15: Image display component16: Conductive layer17: Substrate layer18: Sensor electrode part19: Guide wiring part29: Pen32: Front end part34: Resin film38: Hard coating layer41: Surface and interface property analysis device (measuring device)42: Knife43: Knife tip

圖1係本發明光學積層體之一實施形態的截面圖。 圖2中，圖2A至圖2C係密著力之測定方法的說明圖。圖2A係將裝置之刀尖切入第1薄膜之態樣。圖2B係刀尖達至第1薄膜與第1接著劑層之間的界面並測定該等之密著力之態樣。圖2C係刀尖達至玻璃板與第1接著劑層之間的界面並測定該等之密著力之態樣。 圖3係具備圖1所示光學積層體之有機電致發光顯示裝置的截面圖。FIG. 1 is a cross-sectional view of one embodiment of the optical laminate of the present invention.In FIG. 2, FIG. 2A to FIG. 2C are explanatory views of a method for measuring adhesion. FIG. 2A is a state where the tip of the knife of the device cuts into the first film. FIG. 2B is a state where the tip of the knife reaches the interface between the first film and the first adhesive layer and the adhesion thereof is measured. FIG. 2C is a state where the tip of the knife reaches the interface between the glass plate and the first adhesive layer and the adhesion thereof is measured.FIG. 3 is a cross-sectional view of an organic electroluminescent display device having the optical laminate shown in FIG. 1.

1:光學積層體1: Optical laminate

2:第1薄膜2: The first film

3:第1接著劑層3: First subsequent coating

4:玻璃板4: Glass plate

5:第2接著劑層5: Second subsequent agent layer

6:第2薄膜6: Second film

12:黏著劑層12: Adhesive layer

29:筆29: Pen

32:前端部32: Front end

34:樹脂薄膜34: Resin film

38:硬塗層38: Hard coating

Claims (11)

Translated fromChinese

一種光學積層體，往厚度方向一側依序具備第1薄膜、第1接著劑層、玻璃板、第2接著劑層及第2薄膜；前述厚度方向一側係視辨側；利用奈米壓痕儀法測定之在25℃下之前述第1接著劑層及前述第2接著劑層之分別的壓入彈性模數為1GPa以上且100GPa以下；在下述落筆破裂試驗中，直至前述玻璃板開始破裂為止之筆的落下高度H1為20cm以上；<落筆破裂試驗>將在25℃下之剪切儲存彈性模數G'為0.03MPa且厚度為15μm之黏著劑層配置於前述光學積層體之厚度方向另一面，前述在25℃下之剪切儲存彈性模數G'係藉由頻率1Hz、升溫速度5℃/分鐘、溫度-40℃~150℃、扭轉模式之動態黏彈性試驗求算；使7g且球珠徑0.7mm之原子筆朝前述第2薄膜落下；將筆之落下高度每次提高1cm且提高至30cm為止，並取得確認前述玻璃板有破裂時之高度作為落筆破裂試驗中之高度H1；或者，在筆之落下高度30cm未確認前述玻璃板有破裂時，判斷為具有30cm以上之抗破裂耐久性。An optical laminate, comprising a first film, a first adhesive layer, a glass plate, a second adhesive layer and a second film in order from one side in the thickness direction; the side in the thickness direction is a visual side; the first adhesive layer and the second adhesive layer have respective indentation elastic moduli of 1 GPa or more and 100 GPa or less at 25°C measured by a nanoindenter method; in the following pen-drop fracture test, the pen drop height H1 until the glass plate begins to fracture is 20 cm or more; <Pen-drop fracture test> an adhesive layer having a shear storage elastic modulus G' of 0.03 MPa and a thickness of 15 μm at 25°C is arranged On the other side of the thickness direction of the optical laminate, the shear storage elastic modulus G' at 25°C is calculated by a dynamic viscoelastic test with a frequency of 1 Hz, a heating rate of 5°C/min, a temperature of -40°C~150°C, and a torsion mode; a 7g ballpoint pen with a ball diameter of 0.7mm is dropped toward the second film; the drop height of the pen is increased by 1cm each time until it reaches 30cm, and the height when the glass plate is confirmed to be broken is taken as the height H1 in the pen drop break test; or, when the glass plate is not confirmed to be broken at a drop height of 30cm, it is judged to have a break resistance durability of more than 30cm.如請求項1之光學積層體，其中在下述落筆剝落試驗中，直至前述第1薄膜或前述第2薄膜開始剝落為止之筆的落下高度H2為20cm以上；<落筆剝落試驗>將前述黏著劑層配置於前述光學積層體之厚度方向另一面；使7g且球珠徑0.7mm之原子筆朝前述第2薄膜落下；將筆之落下高度每次提高1cm且提高至30cm為止，並取得確認前述第1薄膜或前述第2薄膜有剝落時之高度作為落筆剝落試驗中之高度H2；或者，於確認前述玻璃板有發生破裂時，判斷為具有破裂高度H1以上之抗剝落耐久性；或者，在筆之落下高度30cm未確認前述第1薄膜及前述第2薄膜有剝落時，判斷為具有30cm以上之抗剝落耐久性。The optical laminate of claim 1, wherein in the following pen-dropping test, the drop height H2 of the pen until the first film or the second film begins to peel off is greater than 20 cm; <Pen-dropping test> the adhesive layer is disposed on the other side of the optical laminate in the thickness direction; a 7 g ballpoint pen with a ball diameter of 0.7 mm is dropped toward the second film; the drop height of the pen is increased by 1 cm each time until the first film or the second film begins to peel off; 30cm, and the height when the aforementioned first film or the aforementioned second film is confirmed to have peeled off is taken as the height H2 in the pen drop test; or, when it is confirmed that the aforementioned glass plate has cracked, it is judged to have anti-peeling durability above the crack height H1; Or, when the aforementioned first film and the aforementioned second film are not confirmed to have peeled off at the pen drop height of 30cm, it is judged to have anti-peeling durability above 30cm.如請求項1或2之光學積層體，其中相對於前述第1薄膜藉由頻率10Hz、升溫速度2℃/分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值，前述第2薄膜藉由前述動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值之比為0.8以上且1.5以下。The optical multilayer body of claim 1 or 2, wherein the ratio of the average value of tanδ of the first film at -100℃ to -50℃ calculated by the dynamic viscoelasticity test at a frequency of 10 Hz, a heating rate of 2℃/min, and a tensile mode to the average value of tanδ of the second film at -100℃ to -50℃ calculated by the dynamic viscoelasticity test is greater than 0.8 and less than 1.5.如請求項1或2之光學積層體，其中前述第1薄膜藉由頻率10Hz、升溫速度2℃/分鐘、拉伸模式之動態黏彈性試驗求算之在-100℃至-50℃下之tanδ的平均值為0.04以上；並且，前述第1薄膜藉由前述動態黏彈性試驗求算之在-100℃至-50℃下之拉伸儲存彈性模數E'的平均值為3GPa以上且6GPa以下。The optical multilayer of claim 1 or 2, wherein the average value of tanδ of the aforementioned first film at -100°C to -50°C calculated by a dynamic viscoelastic test at a frequency of 10 Hz, a heating rate of 2°C/min, and a tensile mode is greater than 0.04; and the average value of the tensile storage elastic modulus E' of the aforementioned first film at -100°C to -50°C calculated by the aforementioned dynamic viscoelastic test is greater than 3 GPa and less than 6 GPa.如請求項1或2之光學積層體，其中前述第1薄膜與前述第1接著劑層之密著力為3.0kN/m以上，前述第1接著劑層與前述玻璃板之密著力為3.0kN/m以上，前述玻璃板與前述第2接著劑層之密著力為3.0kN/m以上，且前述第2接著劑層與前述第2薄膜之密著力為3.0kN/m以上。The optical laminate of claim 1 or 2, wherein the adhesion between the first film and the first adhesive layer is 3.0 kN/m or more, the adhesion between the first adhesive layer and the glass plate is 3.0 kN/m or more, the adhesion between the glass plate and the second adhesive layer is 3.0 kN/m or more, and the adhesion between the second adhesive layer and the second film is 3.0 kN/m or more.如請求項1或2之光學積層體，其中前述第1薄膜與前述第2薄膜分別為三醋酸纖維素薄膜。The optical layered body of claim 1 or 2, wherein the first film and the second film are cellulose triacetate films respectively.如請求項6之光學積層體，其中前述第2薄膜較前述第1薄膜更厚。An optical layered body as claimed in claim 6, wherein the second film is thicker than the first film.如請求項1或2之光學積層體，其更具備配置於前述第2薄膜之前述厚度方向一面的硬塗層。The optical layered body of claim 1 or 2 further comprises a hard coating layer disposed on one side of the aforementioned second film in the aforementioned thickness direction.如請求項1之光學積層體，其中前述第1接著劑層及前述第2接著劑層，係藉由活性能量線之照射或加熱而進行硬化反應之硬化型接著劑之硬化物。The optical laminate of claim 1, wherein the first adhesive layer and the second adhesive layer are hardened adhesives that undergo a hardening reaction by irradiation with active energy rays or heating.如請求項9之光學積層體，其中前述第1接著劑層之厚度為10μm以下，前述第2接著劑層之厚度為10μm以下。The optical laminate of claim 9, wherein the thickness of the first adhesive layer is less than 10 μm, and the thickness of the second adhesive layer is less than 10 μm.如請求項9之光學積層體，其中前述第1接著劑層，係由包含環氧樹脂作為主劑之環氧接著劑組成物之硬化物所構成。As in claim 9, the optical laminate, wherein the first adhesive layer is composed of a cured product of an epoxy adhesive composition containing an epoxy resin as a main agent.

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