Low shrinkage, high tenacity poly(epsilon-caproamide) yarn and p

Details Low shrinkage, high tenacity poly(epsilon-caproamide) yarn and p Low shrinkage, high tenacity poly(epsilon-caproamide) yarn and p

1989-10-20

1992-04-14

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528324, C08G 6914

Patent

active

051049694

ABSTRACT:
A polyamide yarn is disclosed which is at least about 85% by weight poly(.epsilon.-caproamide) and which has a relative viscosity of greater than 50, a tenacity of at least about 9.3 g/d, a dry heat shrinkage at 160.degree. C. of less than about 3 percent, a modulus of at least about 20 g/d, a toughness of at least about 240 g/d.%, a crystal perfection index of greater than about 82, and a long period spacing of greater than about 100 .ANG.. 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 4.8 g/d, subsequently decreasing the tension while heating to at least about 185.degree. C. to produce a length decrease of between about 13.5 and about 30%, and cooling and packaging the yarn.

REFERENCES:
patent: 4758472 (1988-07-01), Kitamura

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