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

1991-12-23

1992-07-28

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528274, 528286, 528302, 528308, 5283086, 525437, 525444, 428480, C08G 6302, C08G 63692

Patent

active

051342227

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 a 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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