William A Chantry

US Patent:

52231879, Jun 29, 1993

Filed:

Jun 26, 1991

Appl. No.:

7/721811

Inventors:

William A. Chantry - Kinston NC
Amy G. Roberson - Winterville NC
Taracad K. Venkatachalam - Wilmington DE

Assignee:

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

International Classification:

B29C 3510
D01D 516
D01F 662
D02J 122

US Classification:

264 25

Abstract:

Polyester of high intrinsic viscosity is spun, steam-heated, drawn and wound up in a multi-stage continuous process to provide an improved monofilament that is particularly suited for reinforcing rubber, e. g. in tires, after suitable dip-coating, stretching and setting.

US Patent:

40039749, Jan 18, 1977

Filed:

Apr 4, 1975

Appl. No.:

5/565079

Inventors:

William Amdor Chantry - Kinston NC
Roddy Merl Conrad - Hamm, DT

Assignee:

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

International Classification:

D01D 508

US Classification:

264210F

Abstract:

A process is provided in which a continuous filament polyethylene terephthalate yarn having an HRV in the range of 24 to 28 is heated to a temperature in the range of 75. degree. to 250. degree. C. and drawn to a total denier in the range of 50 to 500 at a draw ratio in the range of 5. 2:1 to 6:1, passed over a draw roll having a temperature in the range of 225. degree. to 250. degree. C. , relaxed at a tension in the range of 0. 09 to 0. 15 gram per denier and wound up at a minimum speed of 2,000 yards per minute (1829 meters/minute). The yarns prepared by this process have a tenacity in the range of 7. 5 to 9 grams per denier, a load-bearing capacity in the range of 3 to 5 grams per denier at 7% elongation, a maximum dry heat shrinkage of 4% at 177. degree. C. and an elongation at break in the range of 12 to 20%.