Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyosung Advanced Materials Corp
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020030073662Aexternal-prioritypatent/KR100462924B1/en
Priority claimed from KR1020030073664Aexternal-prioritypatent/KR100451262B1/en
Application filed by IndividualfiledCriticalIndividual
Priority claimed from CA002450103Aexternal-prioritypatent/CA2450103C/en
Publication of CA2612863A1publicationCriticalpatent/CA2612863A1/en
Application grantedgrantedCritical
Publication of CA2612863CpublicationCriticalpatent/CA2612863C/en
1. A low shrinkage polyamide fiber, which is produced by a method comprising the steps of: (A) melt-extruding a polyhexamethyleneadipamide polymer through a spinneret at a temperature of 270-320°C, the polymer containing hexamethyleneadipamide repeat units at the amount of at least 85 mol% and having a relative viscosity of 2.5-4.0; (B) quenching and solidifying the extruded polymer below the spinneret by means of cooling gas to form an undrawn yarn, and taking-up the undrawn yarn at a rate of 200-1,000 m/min; and (C) subjecting the undrawn yam to multi-stage drawing to a total draw ratio of at least 4.0, heat treatment and relaxation to form a drawn yarn, and winding the drawn yarn.
2. The low shrinkage polyamide fiber of claim 1, which satisfies the following physical properties: (1) a dry heat shrinkage of 3-6% at 190°C for 15 minutes, (2) a tenacity of at least 9.0 g/d, (3) an elongation of at least 20%, (4) a birefringence of less that 0.065, and (5) a fineness of 200-1,000 deniers.
3. The low shrinkage polyamide fiber of claim 1, which has a total fineness of deniers.
4. The low shrinkage polyamide fiber of claim 1, which has a total fineness of deniers.
5. The low shrinkage polyamide fiber of claim 1, which has a total fineness of deniers.
6. The low shrinkage polyamide fiber of claim 1, wherein the residual time of the polymer in a spinning pack containing the spinneret in the step (A) is 3-30 seconds.
7. The low shrinkage polyamide fiber of claim 1, wherein the relaxation temperature of the drawn yarn in the step (C) is 200-260°C, and the percent relaxation of the yarn is 2-7%.
8. The low shrinkage polyamide fiber of claim 1, wherein the total draw ratio of tch yarn in the step (C) is 4.-6.5.
9. The low shrinkage polyamide fiber of claim 1, wherein the first drawing of the multi-stage drawing in the step (C) is performed at a temperature of 20-50°C.
10. The low shrinkage polyamide fiber of claim 1, wherein the second drawing of the multi-stage drawing in the step (C) is performed at a temperature of 200-250°C.
11. The low shrinkage polyamide fiber of claim 1, wherein the first drawing of the multi-stage drawing in the step (C) is performed at a draw ratio of at least 3Ø
12. The low shrinkage polyamide fiber of claim 6, which has a monofilament fineness of 3-7 deniers.
CA2612863A2003-10-222003-11-17Low shrinkage polyamide fiber and uncoated fabric for airbags made of the sameExpired - LifetimeCA2612863C (en)