Polyester fiber and method for the production thereof

Details Polyester fiber and method for the production thereof Polyester fiber and method for the production thereof

1987-06-04

1988-08-30

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528275, 528279, 528285, 528286, C08G 6368

Patent

active

RE0327417

ABSTRACT:
A polyester fiber having a tenacity of at least 4.0 g/d is formed from a copolyester having a degree of polymerization of from 80 to 100 of which copolyester 1.0 to 2.0 mol % of its acid component has a metal sulfoisophthalic group and 0.5 to 1.9 weight % of which copolyester is provided by a glycol component provided by glycol having a molecular weight of from 400 to 6000. The polyester fiber is readily dyed with basic dyes.
The polyester fiber can be prepared by spinning the copolyester at a shear rate of .ltoreq.10.sup.4 sec.sup.-1, a spinning draft ratio of .ltoreq.250, a back pressure of the spinneret of .gtoreq.40 kg/cm.sup.2 and a shear stress of .ltoreq.(Q+0.7).times.10.sup.7 dyne/cm.sup.2, where Q is the mass output rate per single hole (g/min).

REFERENCES:
patent: 3088956 (1963-05-01), Horn et al.
patent: 3816486 (1974-06-01), Vail
patent: 3899470 (1975-08-01), McGee et al.
patent: 4403094 (1983-09-01), Sasaki et al.
patent: 4415726 (1983-11-01), Tanji et al.
patent: 4426516 (1984-07-01), Kuriki et al.

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