Coloured coverlayTechnical field
The utility model relates to a kind of coverlay of printed circuit board (PCB).
Background technology
The progress of information, communication industry has driven the development of microelectronic industry, and flexible print wiring board (FPC) arises at the historic moment, and has obtained fast development, is used widely at numerous areas such as cell phone, notebook computer, LCDs.Printed circuit board (PCB) is a material indispensable in the electronic product, and along with the consumption electronic products demand is grown up, and also grows with each passing day for the demand of printed circuit board (PCB).Because but flexible print wiring board has characteristics such as flexibility and three-dimensional space distribution; Drive under the gesture in the emphasical development compact, flexibility of technicalization electronic product, computer and ancillary equipment thereof, communication product and consumption electronic products or the like at present are widely used.
Generally speaking, flexible print wiring board mainly is to be made up of copper clad laminate (FCCL) and coverlay (CL).In this board structure of circuit, generally use plastic film as coverlay, perhaps utilize screen printing technology to form one deck thin insulating printing ink.These convention coverlays exist ink lay be full of cracks or problem such as come off.In addition; Most in the market coverlay is the light Kapton, and the function of covering circuit layout for the polyimides diaphragm is had then forms coloured adhesion layer on Kapton; Yet; Though this kind structure reaches the purpose of covering, the glossiness on Kapton surface is still bright excessively, can't satisfy the particular optical demands of applications.In order to offset the demand of optical activity polyimides diaphragm in response to market; Use is added with coloured Kapton of dyestuff; And on this coloured Kapton, form adhesion layer, though the polyimides diaphragm made from this kind mode has extinction effect preferably, yet the cost of coloured Kapton is too high; Be not inconsistent demand during actual volume production, and the anxiety that the polyimides diaphragm that contains additive also has character variation such as tensile strength, dimensional stability is considered.So, obtain low-cost, the racemization photosensitiveness is good and have the coverlay of excellent folding quality, is the problem for remaining unsolved at present.
At present along with the development of mobile phone, panel computer industry, more and more come into one's own for the design protection of wiring board, along with the extensive use of black matt coverlay; Line design has obtained good protection; But each tame mobile phone, panel computer merchant demand is the wiring board material that own characteristic is arranged at present, and big producer of promptly every family all hopes to have the wiring board design of the own characteristic of representative; Therefore; The demand of coloured coverlay is just increasing, and each manufacturer can select the color of different main flows according to the characteristics of oneself, is formed with the circuit sheet material of own characteristic; And main sale in the market is white and black coverlay; In order to satisfy client's demand; And the characteristic line plate of each tame producer demand; Demand to red, blue, purple or the like coloured coverlay is increasing, seeks the demand point that coloured coverlay a kind of cheapness, that be prone to system becomes industry.
The utility model content
In order to overcome above-mentioned defective; The utility model provides a kind of coloured coverlay; This coloured coverlay not only can reach the effect of covering circuit and delustring; And can distinguish coloured wiring board of every client of family through the different colours of coverlay, can also improve the dimensional stability of coverlay, again and simple in structure, easy to implement.
The utility model for the technical scheme that solves its technical problem and adopt is:
A kind of coloured coverlay is provided with insulating basement membrane, and said insulating basement membrane has two relative surfaces, is stained with insulation glue-line and coloured insulating polymer layer on two surfaces of said insulating basement membrane respectively.Said " coloured " of the coloured insulating polymer layer in the utility model is meant the color except that the true qualities of material layer; And except containing conventional black and white two kinds the color; Also comprise colors such as for example red, orange, yellow, green, blue, ingot or purple, also can be on these primary colours printed patterns and customer ID (logo).On insulating basement membrane, adhere to coloured insulating polymer layer and can play the effect of covering circuit and delustring; And can improve the dimensional stability of coverlay; And what deserves to be mentioned is can also play identification different customer line plates function; Require to paste blue coverlay like first client's wiring board, second client's wiring board requires to paste red coverlay, can be that the color of wiring board distinguishes out through coverlay is which client's of family wiring board; Make different clients that the individual character wiring board color of oneself can be arranged, play the effect that identification is distinguished.
The utility model for the further technical scheme that solves its technical problem and adopt is:
Be provided with release layer, said release layer adheres on the said insulation glue-line, and said insulation glue-line is folded between said insulating basement membrane and the said release layer, and this release layer is used to keep the viscosity of said insulation glue-line, is beneficial to successive process.Preferably, the thickness of said release layer is 30～200um.
Said insulating basement membrane is polyimides (PI) film, polyester (PET) film, gather a kind of in naphthalene ester (PEN) film and liquid crystal polymer (LCP) film, preferably polyimides (PI) film.Preferably, the thickness of said insulating basement membrane is 7～100um.
Said coloured insulating polymer layer is a kind of in coloured polyimide layer, coloured polyester layer, pigmented acrylic ester layer, colored ink layer and the coloured epoxy resin layer.Preferably, said coloured insulating polymer layer is polyimide layer, the polyester layer that is added with inorganic color, the acrylate layer that is added with inorganic color that are added with inorganic color, is added with the ink lay of inorganic color and is added with the epoxy resin layer of inorganic color.Add the inorganic color of different colours according to the difference of color demand, then add the blue inorganic colorant when the configuration polymer like the blue insulating polymer layer of needs.Preferably, the thickness of said coloured insulating polymer layer is 1～25um.
Said insulation glue-line is a kind of in epoxy glue layer, acrylic acid ester glue-line, polyester glue-line, polyurethane glue-line and the polyimides glue-line.Preferably, the thickness of said insulation glue-line is 5～50um.
The beneficial effect of the utility model is: coloured coverlay of the utility model mainly is made up of insulating basement membrane, insulation glue-line and coloured insulating polymer layer; On insulating basement membrane, adhere to coloured insulating polymer layer and can play the effect of covering circuit and delustring; And can improve the dimensional stability of coverlay; And can be that the color of wiring board distinguishes out through coverlay be which client's of family wiring board, make different clients that the characteristic line plate color of oneself can be arranged, play the effect that identification is distinguished.
Description of drawings
Fig. 1 is coloured coverlay generalized section of the utility model.
The specific embodiment
Embodiment: the preferred embodiment of the utility model is set forth in detail below in conjunction with accompanying drawing; Thereby the protection domain of the utility model is made more explicit defining so that advantage of the utility model and characteristic can be easier to it will be appreciated by those skilled in the art that.
A kind of coloured coverlay; Be provided with insulating basement membrane 1; Said insulating basement membrane has two relative surfaces, is stained with insulation glue-line 2 and coloured insulating polymer layer 3 on two surfaces of said insulating basement membrane respectively, also is provided with release layer 4; Said release layer adheres on the said insulation glue-line, and said insulation glue-line is folded between said insulating basement membrane and the said release layer.
Wherein, said insulating basement membrane 1 for polyimides (PI) film, polyester (PET) film, gather a kind of in naphthalene ester (PEN) film and liquid crystal polymer (LCP) film, polyimides (PI) film preferably.The thickness of said insulating basement membrane 1 is 7～100um.
Wherein, said coloured insulating polymer layer 3 for polyimide layer, the polyester layer that is added with inorganic color, the acrylate layer that is added with inorganic color that are added with inorganic color, be added with the ink lay of inorganic color and be added with the epoxy resin layer of inorganic color.Add the inorganic color of different colours according to the difference of color demand, then add the blue inorganic colorant when the configuration polymer like the blue insulating polymer layer of needs.The thickness of said coloured insulating polymer layer 3 is 1～25um.
Wherein, said insulation glue-line 2 is a kind of in epoxy glue layer, acrylic acid ester glue-line, polyester glue-line, polyurethane glue-line and the polyimides glue-line.The thickness of said insulation glue-line 2 is 5～50um.
Wherein, the thickness of said release layer 4 is 30～200um.
Above-mentioned coloured coverlay can make through following method:
One, utilize organic solvent to come each required component of mixed dissolution; Form the liquid dispersion (when the insulating polymer layer of what color of needs, just using the inorganic color of corresponding color to fill) of coloured insulating polymer layer; Use the coating production equipment that the liquid dispersion of this coloured insulating polymer layer is coated on the insulating basement membrane; Coloured insulating polymer layer after this is coated with is removed the organic solvent that includes and is reached curing, in order to avoid when rolling, adhere to each other through online drying oven;
Two, utilize organic solvent to mix each required component; Form the liquid dispersion of insulation glue-line, the liquid dispersion of this insulation glue-line is used be coated with the opposite side that production equipment is coated on insulating basement membrane, through the baking of online drying oven; The organic solvent that removal includes; And make the insulation colloid reach the moving semi-cured state of semi-fluid, and on the insulation glue-line, paste separated type material at last, be formed with the wrapping epiphragma;
The key property of this coloured coverlay need reach the basic demand of general coverlay, and the unanimity of the colourity of coloured insulating polymer layer between need keeping batch, and need reach corresponding depth of defilade and dullness.
The coloured coverlay and the prior art coverlay (comparative example) of present embodiment are done dimensional stability, reflectivity and the test of scolding tin hear resistance, and test result is recorded in table one.
Table one:
| Embodiment | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Insulating basement membrane | Yellow | Yellow | Yellow | Yellow | Black |
| The insulation glue-line | Transparent | Transparent | Transparent | Transparent | Transparent |
| The insulating polymer layer | Coloured | Do not have | Black | White | Do not have |
| Dimensional stability | 0.1％ | 0.2％ | 0.15％ | 0.17％ | 0.2％ |
| The scolding tin hear resistance | 288℃10S | 288℃10S | 288℃10S | 288℃10S | 288℃10S |
| Reflectivity | 82％ | 95％ | 85％ | 87％ | 83％ |
| Cover power | Opaque | Transparent | Opaque | Opaque | Opaque |
Can know that by table one coloured coverlay of the present invention has excellent size stability and scolding tin hear resistance, and have antiradar reflectivity (delustring), also have the circuit of covering effect.