Low shrinkage, high tenacity poly (hexamethylene adipamide) yarn

Details Low shrinkage, high tenacity poly (hexamethylene adipamide) yarn Low shrinkage, high tenacity poly (hexamethylene adipamide) yarn

1989-10-20

1991-12-31

Kendell, Lorraine T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428373, 57243, D02G 300

Patent

active

050771248

ABSTRACT:
A polyamide yarn is disclosed which is at least 85% by weight poly(hexamethylene adipamide) and which has a relative viscosity of greater than 50, a tenacity of at least about 9.5 g/d, a modulus of at least about 30 g/d, a shrinkage at 160.degree. C. of less than about 2 percent, a crystal perfection index of greater than about 83, and a long period spacing of greater than about 105 .ANG.. The process for making the yarn includes drawing of a feed yarn while heating to at least about 190.degree. C. in at least a final draw stage to a draw tension of at least 3.8 g/d, subsequently decreasing the tension while heating to at least about 190.degree. C. to produce a length decrease of between about 13.5 and about 30%, and cooling and packaging the yarn.

REFERENCES:
patent: 4496630 (1985-01-01), Kurita et al.
patent: 4504545 (1985-03-01), Kurita et al.
patent: 4621021 (1986-11-01), Kitamura
patent: 4701377 (1987-10-01), Kurita et al.
patent: 4758472 (1988-07-01), Kitamura

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