D - Textiles – Paper – 02 – J
Patent
D - Textiles, Paper
02
J
18/634
D02J 1/22 (2006.01) D01F 6/60 (2006.01)
Patent
CA 2028061
TITLE Low Shrinkage, High Tenacity Poly(Hexamethylene Adipamide) Yarn and Process for Making Same ABSTRACT OF THE DISCLOSURE 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°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°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°C to produce a length decrease of between about 13.5 and about 30%, and cooling and packaging the yarn.
Clark Thomas R. III
Cofer Joseph A. Jr.
Mochel Alan R.
Clark Thomas R. III
Cofer Joseph A. Jr.
E.i. Du Pont de Nemours And Company
Mochel Alan R.
Sim & Mcburney
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