Poly(butylene terephthalate) copolyester and a process for prepa

Details Poly(butylene terephthalate) copolyester and a process for prepa Poly(butylene terephthalate) copolyester and a process for prepa

1992-05-04

1992-11-10

Kight, III, John

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

528272, 528287, 528302, 528308, 5283086, 525437, 525444, 428374, D02C 300

Patent

active

051621533

ABSTRACT:
Poly(butylene terephthalate) copolyester advantageous of use as sheath materials in bicomponent fibers are prepared by a process for preparing a high-molecular weight, linear copolyester by condensing 40-85 molar percent of terephthalic acid optionally in the form of a dialkyl ester, half of which component can optionally be replaced by another dicarboxylic acid also optionally in the dialkyl ester form, and 60-15 molar percent of a blend of dimethyl adipate, dimethyl glutarate and dimethyl succinate with an alkanediol of 2-6 carbon atoms in its carbon chain, at an elevated temperature in the presence of a conventional catalyst, in a first condensation stage which is an interesterification or esterification stage and a second condensation stage which is polycondensation stage, whereby a copolyester melt is produce. The process comprises, before or during the first condensation stage, adding 0.005-0.1 molar percent, based on the total acid component, of a C.sub.6 -aryl or C.sub.7 -alkaryl ester of phosphorous acid or of phosphoric acid to the reaction mixture.

REFERENCES:
patent: 4328059 (1982-05-01), Horlbeck et al.
patent: 4559370 (1985-12-01), Blanpied

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