Ultra-oriented crystalline filaments

Ultra-oriented, crystalline synthetic filaments with high tenacity are produced by extrusion of a fiber-forming synthetic polymer melt into a liquid isothermal bath maintained at a temperature of at least 30.degree. C. above the glass transition temperature of the polymer, withdrawing the filaments from the bath and then winding up the filaments. Polymer filaments so produced are characterized in that the ratio of the crystalline orientation factor (f.sub.c) to the amorphous orientation factor (f.sub.a) is 1.2 or less, and are further characterized in that the percent crystallinity is less than 40. The filaments also have a fine crystal size. The crystal size is less than 40 .ANG. in the 100 and 105 planes and less than 30 .ANG. in the 010 plane.

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Claims

19. As-spun polyethylene terephthalate polymer filaments having a birefringence of about 0.2 or greater and exhibiting a crystalline X-ray diffraction pattern..Iaddend..Iadd.20. As-spun polyethylene terephthalate polymer filaments according to claim 19 exhibiting radial uniformity of birefringence..Iaddend..Iadd.21. As-spun polyethylene terephthalate polymer filaments according to claim 19 having a tenacity of 7-9 g/d..Iaddend..Iadd.22. As-spun polyethylene terephthalate polymer filaments according to claim 19 having a weight percent crystallinity of less than 40..Iaddend..Iadd.23. As-spun polyethylene terephthalate polymer filaments according to claim 22 having a weight percent crystallinity of less than 25..Iaddend..Iadd.24. As-spun polyethylene terephthalate polymer filaments according to claim 19 having a crystal size of less than 40.ANG. in the 100 and 105 planes and less than 30.ANG. in the 010 plane..Iaddend..Iadd.25. As-spun polyethylene terephthalate polymer filaments according to claim 19 wherein said birefringence is 0.2-0.22..Iaddend.

Referenced Cited
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Other references
  • Hawley's Condensed Chemical Dictionary p. 934 date 1930. T. Kawaguchi, Industrial Aspects of High-Speed Spinning, Chapter 3, "Industrial View on High-Speed Spinning", p. 8-15 (1985).
Patent History
Patent number: RE35972
Type: Grant
Filed: Mar 25, 1996
Date of Patent: Nov 24, 1998
Assignee: North Carolina State University (Raleigh, NC)
Inventors: John A. Cuculo (Raleigh, NC), Paul A. Tucker (Raleigh, NC), Gao-Yuan Chen (Apex, NC), Ferdinand Lundberg (Raleigh, NC)
Primary Examiner: Newton Edwards
Law Firm: Bell Seltzer Intellectual Property Law Group of Alston & Bird LLP
Application Number: 8/622,431
Classifications
Current U.S. Class: Rod, Strand, Filament Or Fiber (428/364); Polyamide, Polyimide Or Polyester (428/395); High Modulus Filament Or Fiber (428/902); 428/243
International Classification: D02G 300; D02G 302;