Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
2642108, 2642356, 2642896, 2642905, D01D 510, D02J 122
Disclosed herein are poly(phenylene sulfide) fibers having a tensile strength of at least 3.5 g/d, a knot tenacity of at least 2 g/d, a loop tenacity of at least 3.5 g/d, the number of abrasion cycles until breaking in a flexing abrasion test of at least 3,000 times, and the number of repeated flexings until breaking in a flexural fatigue test of at least 150 times. A process for the production of poly(phenylene sulfide) fibers, which comprises melt-spinning a poly(phenylene sulfide), stretching the resultant unstretched filaments at a draw ratio of 2:1 to 7:1 within a temperature range of 80.degree.-260.degree. C., and heat-treating the stretched filaments for 0.1-30 seconds under conditions of a take-up ratio of 0.8:1 to 1.35:1 in a dry heat atmosphere exceeding 285.degree. C., but not exceeding 385.degree. C., is also disclosed.
patent: 4645826 (1987-02-01), Iizuka et al.
patent: 4976908 (1990-12-01), Muzino et al.
World Patents Index Latest Week 9014 Derwent Publications, Ltd., London GB; AN 90-103290 & JP-A-2 053 913 (Toray Monofilament) Feb. 22, 1990 abstract.
World Patents Index Latest Week 8806, Derwent Publications, Ltd., London, GB; AN 88040110 & JP-A-62 299 513 (Toray Monofilament) Dec. 26, 1987 abstract.
Kureha Kagaku Kogyo K.K.
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