Process of making spin-oriented polyester filaments

U.S. Patent Number: 5384082

Abstract: Polyester filaments of high shrinkage and high shrinkage tension may be prepared by heat treatment of undrawn crystalline filaments of low shrinkage and shrinkage tension, and may be used for making polyester yarns of mixed shrinkage and bulky polyester yarns and fabrics therefrom.

Inventors: Frankfort; Hans R. E. (Kinston, NC), Knox; Benjamin H. (Wilmington, DE), Pai; Girish A. (Newark, DE)

Assignee: E. I. Du Pont de Nemours and Company (Wilimington, DE)

Application Number: 08/085,266

Issued: 1995-01-24

Expired: 2007-01-24

Classes: 264/103 ; 264/168; 264/172.18; 264/177.13; 264/210.8; 264/211.12; 264/211.15; 264/211.17; 264/234; 264/235; 264/237; 264/342RE; 28/254; 28/271; 57/287; 57/289; 57/310; 57/350; 57/908

Field of search: 264/103,168,177.13,210.8,211.12,211.15,211.17,234,235,237,342RE,171 28/254,271 57/287,288,289,310,350,908

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