Alan R Mochel

US Patent:

51049694, Apr 14, 1992

Filed:

Oct 20, 1989

Appl. No.:

7/424847

Inventors:

Thomas R. Clark - Hixson TN
Joseph A. Cofer - Hixson TN
Alan R. Mochel - Signal Mountain TN

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C08G 6914

US Classification:

528323

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.

US Patent:

51397293, Aug 18, 1992

Filed:

Dec 4, 1991

Appl. No.:

7/802395

Inventors:

Thomas R. Clark - Hixson TN
Joseph A. Cofer - Hixson TN
Alan R. Mochel - Signal Mountain TN

Assignee:

E. I. Du Pont de Nemours and Comapny - Wilmington DE

International Classification:

D02J 122

US Classification:

2642896

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.

US Patent:

50771248, Dec 31, 1991

Filed:

Oct 20, 1989

Appl. No.:

7/424436

Inventors:

Thomas R. Clark - Hixson TN
Joseph A. Cofer - Hixson TN
Alan R. Mochel - Signal Mountain TN

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

D02G 300

US Classification:

428364

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.