High tenacity, high modulus polyamide yarn and process for makin

Details High tenacity, high modulus polyamide yarn and process for makin High tenacity, high modulus polyamide yarn and process for makin

1989-10-20

1992-04-21

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528323, C08G 6926

Patent

active

051069466

ABSTRACT:
A yarn comprised of a polyamide which is at least about 85% poly(hexamethylene adipamide) or poly(.epsilon.-caproamide) is disclosed which has a relative viscosity of greater than about 50, a tenacity of greater than about 11.0 g/d, a dry heat shrinkage at 160.degree. C. of not more than about 6.5 percent, a boil-off shrinkage of less than about 7%, a modulus of greater than about 35 g/d, a birefringence of greater than about 0.060, a differential birefringence D: .DELTA..sub.0.90-0.00, of greater than 0, and a sonic modulus of greater than about 90 g/d. The process for making the yarn includes drawing of a feed yarn while heating to at least about 185.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 185.degree. C. to produce a length decrease of between about 2 and about 13.5, and cooling and packaging the yarn.

REFERENCES:
patent: 4496630 (1985-01-01), Kurita et al.
patent: 4504545 (1985-03-01), Kurita et al.
patent: 4701377 (1987-10-01), Kurita et al.
patent: 4758472 (1989-07-01), Kitamura

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