High-strength polyester yarn and process for its preparation

Details High-strength polyester yarn and process for its preparation High-strength polyester yarn and process for its preparation

1985-08-28

1990-11-27

Cannon, James C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

2642106, 2642108, 26421117, 428364, 428902, B29K 6700, D01F 600, D02J 122, B29C 5500

Patent

active

049736574

ABSTRACT:
The invention relates to a high-strength polyester yarn having a heat shrinkage at 200.degree. C. of less than 7%, a degree of elasticity ED.sub.20 of at least 90%, a stability quotient SQ of at least 7.5 and a crystallinity of about 57% to 65%. Such yarns can be obtained by high-speed pinning of filaments which have at least a birefringence of 0.025 and an average molecular weight corresponding to a relative viscosity of 1.9 to 2.2 and are subjected to a stretching at high temperatures using a stretch ratio of at least 90% of the maximum cold stretch ratio and a stretching tension between 19 and 23 cN/tex.

REFERENCES:
patent: 4195052 (1980-03-01), Davis et al.
patent: 4251481 (1981-02-01), Hamlyn
patent: 4369155 (1983-01-01), Schiso et al.
patent: 4414169 (1983-11-01), McClary
patent: 4456575 (1984-06-01), Smith et al.
patent: 4491657 (1985-01-01), Saito et al.
patent: 4496505 (1985-06-01), Tanji et al.
patent: 4743504 (1988-05-01), Carr
Sowj. Beitrage Fur Faserforsch. u. Textiltechnik 1971 S. 521-524.
Pahshoer, Khimicheskie Volokna, 1983, 1, 59-61.
Faserforsch. und Textiltechn. 28, (1977), 296-301.

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