Composition and process for making fine denier polyamide fiber

Patent metadata

Field	Value
Publication number	US-10000637-B2
Application number	US-201414896164-A
Country	US
Kind code	B2
Filing date	May 27, 2014
Priority date	Jun 6, 2013
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A composition for making polyamide fiber comprises: (a) about 85 to about 99.9% by weight, preferably about 90 to about 99.5% by weight, more preferably about 95 to about 99.5%, such as about 95 to about 99% by weight of a polyamide, based on the total weight of the composition; (b) about 0.1% to about 15% by weight, preferably about 0.1% to about 10% by weight, more preferably about 0.5% to about 5%, such as about 1 to about 5% by weight of one or more thermoplastic polymers, based on the total weight of the composition, wherein the thermoplastic polymer in the composition is miscible with component (a). A process for making a polyamide fiber uses the composition of the invention.

First claim

The invention claimed is:

1. A composition for making polyamide fiber, comprising:
(a) about 85 to about 99.9% by weight of a polyamide, based on the total weight of the composition,
(b) about 0.1% to about 15% by weight of one or more thermoplastic polymers, based on the total weight of the composition, wherein the thermoplastic polymer in the composition is miscible with component (a); and
wherein the thermoplastic polymer is a copolymer of a vinyl aromatic monomer and a (meth)acrylate, and
the vinyl aromatic monomer is an non-substituted styrene or styrene substituted with one or more groups selected from the group consisting of methyl, ethyl and propyl; and the alcohol moiety in the (meth)acrylate is derived from C 1 -C 10 alkyl alcohol.

2. The composition of claim 1 , wherein the weight average molecular weight of the thermoplastic polymer is in the range of 1,000 to 20,000.

3. The composition of claim 1 , wherein the molar ratio of the vinyl aromatic monomer to the (meth)acrylate polymerized into the copolymer is in the range of about 1:100 to about 100:1.

4. The composition of claim 1 further comprising one or more of an additive comprising: an antioxidant, an antistatic agent, and an UV-absorbing agent.

5. The composition of claim 4 , wherein the antioxidant is selected from the group consisting of: phosphorus based antioxidants, phenolic antioxidants, sulfur based antioxidants and Antioxidant 163.

6. The composition of claim 4 , wherein the amount of the additive in the composition is in the range of 0-10 percent by weight, based on the total weight of the composition.

7. A process for making a polyamide fiber, comprising the step of spinning a composition comprising:
(a) about 85 to about 99.9% by weight of a polyamide, based on the total weight of the composition,
(b) about 0.1% to about 15% by weight of one or more thermoplastic polymers, based on the total weight of the composition, wherein the thermoplastic polymer in the composition is miscible with component (a); and wherein the thermoplastic polymer is a copolymer of a vinyl aromatic monomer and a (meth)acrylate; and wherein the vinyl aromatic monomer is an non-substituted styrene or styrene substituted with one or more groups selected from the group consisting of methyl, ethyl and propyl; and the alcohol moiety in the (meth)acrylate is derived from C 1 -C 10 alkyl alcohol.

8. The process of claim 7 , comprising steps of:
A. obtaining an additive masterbatch comprising the component (b) and the component (a), wherein in the additive masterbatch, the amount of the component (b) is less than 25%, based on the total weight of the additive masterbatch,
B. melt-blending the additive masterbatch and additional component (a) to obtain the composition , and
C. spinning the composition of step B.

9. The process of claim 8 , wherein before step B, the process further comprises the step of: (A1) drying the additive masterbatch of step A.

10. A polyamide fiber made from the composition defined according to claim 1 .

11. The process of claim 7 comprising a high shear rate during the process, with the shear rate being at least 2000 s − .

12. An article, prepared from the polyamide fiber of claim 10 .

13. A blend, comprising the polyamide fiber of claim 10 .

14. The polyamide fiber of claim 10 comprising a having a linear density in the range of from 0.3 to 0.8 dtex and a tensile strength in the range of from 2.7 to 3.6 cN/dtex.

Assignees

• Basf Se
• Basf Aux Chemicals Co Ltd
• Basf Aux Chemcials Co Ltd

Inventors

• Yin Gary
• Wang Yanping
• Ni Jianhua

Classifications

• D01D1/02

  Preparation of spinning solutions · CPC title

• C08L77/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) · CPC title

• D01F6/90

  of polyamides · CPC title

• D01D1/04

  Melting filament-forming substances · CPC title

• C08L77/06

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title