High-molecular weight linear polyesters and a process for prepar

Details High-molecular weight linear polyesters and a process for prepar High-molecular weight linear polyesters and a process for prepar

1980-10-09

1982-05-04

Lieberman, Allan

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

427195, 528286, 528302, 528487, 524139, B05D 300, C08K 322, C08L 6702, C09J 316

Patent

active

043280595

ABSTRACT:
High molecular weight linear polyesters advantageous for use as hot melt adhesives and powder coating agents, 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 adipic acid, 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 condenstation stage which is an interesterification or esterification stage and a second condenstation stage which is a polycondensation stage, whereby a copolyester melt is produce. The process comprises, before or during the first condensation stage, adding 0.005-01 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; and, after termination of the second condensation stage, adding 0.01-0.2 molar percent, based on the total acid component, of hypophosphorous acid to the finished copolyester melt.

REFERENCES:
patent: 3546177 (1970-12-01), Kibler et al.
patent: 3787530 (1974-01-01), Bohn et al.
patent: 4115371 (1978-09-01), Bier et al.
patent: 4123420 (1978-10-01), Kyo et al.
patent: 4173658 (1979-11-01), Bax et al.
patent: 4208527 (1980-06-01), Horlbeck et al.
patent: 4252940 (1981-02-01), Sublett

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