Polyester multifilament yarn and process for producing thereof

Details Polyester multifilament yarn and process for producing thereof Polyester multifilament yarn and process for producing thereof

1982-03-03

1985-01-01

Czaja, Donald

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

Synthetic resins

From carboxylic acid or derivative thereof

264176F, 2642108, 5283082, 5283086, C08G 6302

Patent

active

044916574

ABSTRACT:
A polyester multifilament yarn which has the following properties: an initial modulus (Mi) of 90 to 130 grams per denier, a terminal modulus (Mt), a shrinkage index value (.DELTA.S/IV) of 2 to 8 percent, a birefringence (.DELTA.n) of 165.times.10.sup.-3 to 190.times.10.sup.3, a crystalline orientation function (fc) of 0.93 to 0.97, a crystal size (D) 47 to 55 angstroms, a long period (Lp) of 130 to 145 angstroms, a molecular orientation index in the amorphous region (F) of 0.80 to 0.92, and a concentration of carboxyl end groups (--COOH) of 0 to 25 equivalents per 10.sup.6 grams of the polymer is disclosed. The yarn is improved in modulus and shrinkage. A textile reinforcement for tire cord obtained from the multifilament yarn, exhibits exceedingly improved resistance to fatigue and durability to heating. The polyester multifilament yarn is obtained by (A) melt-spinning polymer at high speed (B) solidifying the spun yarn through a solidification zone comprising (a) a heating zone and (b) cooling zone adjacent to the lower part of the heating zone, and (C) withdrawing the solidified yarn, and (D) hot drawing the yarn.

REFERENCES:
patent: 3969462 (1976-07-01), Stofan
patent: 4101525 (1978-07-01), Davis et al.
patent: 4134882 (1979-01-01), Frankfort et al.
patent: 4156071 (1979-05-01), Knox
patent: 4338275 (1982-07-01), Carr
patent: 4349501 (1982-09-01), Hamlyn
patent: 4374797 (1983-02-01), Koschinek et al.

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