# US 10,370,780 B2 · High strength polyamide yarn

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- Number: US 10,370,780 B2
- Document ID: US10370780B2
- Status: Granted
- Kind: B2
- Application number: 15/551,633
- Filed: 2016-02-23
- Published: 2018-02-08
- Granted: 2019-08-06
- Earliest claimed: 2015-02-23
- Assignees: Dsm IP Assets B.V.
- Applicants: Dsm IP Assets B.V.
- Inventors: Martinus Joseph Maria Keulers; Roman Stepanyan; Hao Chen
- Web page: https://patentgrep.com/patent/US10370780B2

## CPC

- D02G 3/04: Blended or other yarns or threads containing components made from different materials
- D01D 5/16: using rollers, or like mechanical devices, e.g. snubbing pins
- D01F 6/80: from copolyamides
- D01F 6/805: {from aromatic copolyamides}
- D02G 3/446: {Yarns or threads for use in automotive applications}
- D10B 2331/02: polyamides (D10B2331/08 takes precedence)
- D10B 2505/022: for tyres
- D10B 2505/124: Air bags
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES

## Abstract

The invention relates to a yarn comprising a copolyamide in an amount of at least 90 wt % with respect to the total weight of the yarn, which copolyamide comprises a) at least 95 wt % by weight with respect to the total weight of copolyamide, monomeric units derived from hexamethylene diamine and adipic acid and b1) cyclic monomeric units derived from a diamine X, and cyclic monomeric units derived from a diacid Y, and/or b2) cyclic monomeric units derived from an amino acid Z, in which the summed amount of monomeric units derived from X,Y and Z is between 0.1 to 4.5 wt % by weight with respect to the total weight of the copolyamide and wherein the yarn has a tensile strength of at least 80 cN/tex as measured according to ASTM D885-04. The invention also relates to a process for preparing the yarn.

## Claims

### Claim 1

A process for preparing a yarn which comprises the following steps:
(a) providing a composition comprising a copolyamide comprised of at least 95 wt % with respect to the total weight of the copolyamide of (i) monomeric units derived from hexamethylene diamine and adipic acid, and (iia) cyclic monomeric units derived from a diamine X, and cyclic monomeric units derived from a diacid Y and/or (iib) cyclic monomeric units derived from an amino acid Z, wherein the monomeric units derived from the diamine X, the diacid Y and the amino acid Z are present in a summed amount of between 0.1 to 4.5 wt % with respect to the total weight of the copolyamide;
(b) directing the composition to an extruder, optionally mixing the composition with additives, and melting the composition optionally mixed with additives in the extruder to obtain a molten composition;
(c) extruding the molten composition through a spinneret to form filaments and thereafter stretching, cooling and combining the filaments to form at least one yarn;
(d) subjecting the at least one yarn to a drawing process at a temperature between 25° C. and 265° C. to achieve a draw ratio between 4 and 6 to thereby obtain at least one drawn yarn;
(e) relaxing the at least one drawn yarn by 4% to 10% in at least three relaxing stages while maintaining the at least one drawn yarn in a temperature range of 250° C. to 260° C.; and thereafter
(f) winding up the at least one drawn yarn, wherein the at least one drawn yarn has a tensile strength of at least 80 cN/tex as measured according to ASTM D885-04.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the drawing process according to step (d) is carried out at a temperature between 50° C. and 215° C.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the additives comprise a stabilizer and/or a pigment.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the monomeric units derived from the diamine X and the diacid Y are present in substantially equal molar amounts.

### Claim 5 (depends on 1)

The process according to claim 1, wherein the at least one drawn yarn has a tensile strength of at least 85 cN/tex as measured according to ASTM D885-04.

### Claim 6 (depends on 1)

The process according to claim 1, wherein the summed amount of the monomeric units derived from the diamine X, the diacid Y and the amino acid Z is between 0.5 to 4.0 wt % with respect to the total weight of the copolyamide.

### Claim 7 (depends on 1)

The process according to claim 1, wherein the diamine X is isophorone diamine and the diacid Y is isophthalic acid and/or terephthalic acid.

### Claim 8 (depends on 1)

The process according to claim 1, wherein the at least one drawn yarn has a hot air shrinkage (HAS) of between 1.0 to 7.0% as measured according to ASTM D4974-04 at 177° C. for 2 minutes.

### Claim 9 (depends on 1)

The process according to claim 1, wherein the at least one drawn yarn has a titer of between 200 to 700 dtex.

### Claim 10 (depends on 9)

The process according to claim 9, wherein the at least one drawn yarn has a titer of between 300 dtex and 500 dtex and a tenacity of at least 85 cN/tex.

### Claim 11 (depends on 1)

The process according to claim 1, wherein the yarn has a hot air shrinkage (HAS) of at most 5.0%, a tenacity of at least 85 cN/tex, and a titer of between 300 dtex and 500 dtex.

### Claim 12 (depends on 11)

An air bag fabric comprising a yarn made by the process according to claim 11.