Process for producing high molecular weight polyester fibers

Details Process for producing high molecular weight polyester fibers Process for producing high molecular weight polyester fibers

1994-03-15

1995-09-19

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264178F, 2642105, 2642108, 26421115, 26421116, 26421117, 264233, 2642356, D01F 662

Patent

active

054513596

ABSTRACT:
High molecular weight polyester fibers having excellent mechanical strength and useful for various industrial materials, is produced by dry-jet wet spinning a dope solution of a polyester resin comprising repeating ethylene terephthalate units, having an intrinsic viscosity of 1.2 or more and dissolved in a phenolic solvent, through a spinneret, coagulating the resultant filamentary dope solution streams in a bath of coagulating liquid in which the phenolic solvent is soluble and the polyester resin is insoluble, while controlling the temperature of the coagulating liquid to a level of from (Tg-50.degree. C.) to (Tg+45.degree. C.) wherein Tg represents a glass transition temperature of the dope solution, and optionally subjecting the resultant undrawn polyester filaments to a rinsing step with a rinsing liquid, to a drawing step at a total draw ratio of at least 5, and to a heat-treating step.

REFERENCES:
patent: 2924500 (1960-02-01), Huffman et al.
patent: 2924501 (1960-02-01), Wagner et al.
patent: 2924502 (1960-02-01), Ucci et al.
Patent Abstracts of Japan, vol. 12 No. 148 (C-493) 7 May 1988 & JP-A-62 263 317 (Mitsubishi Rayon Co., Ltd.).
Patent Abstracts of Japan, vol. 11, No. 43 (C-402) 7 Feb. 1987 & JP-A-61 207 616 (Teijin Ltd.)
Database WPI Section Ch, Week 7924, Derwent Publications Ltd., London, GB; Class A, AN 79-44895B & JP-A-54 055 622.
Journal of Applied Polymer Science vol. 40, 1257-1263, 1990 SEN-I Gakkaishi, vol. 48, No. 10 569-575, 1992.

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