Method for manufacturing heat-stable polyesters using phosphonic

Details Method for manufacturing heat-stable polyesters using phosphonic Method for manufacturing heat-stable polyesters using phosphonic

1981-05-29

1983-02-22

Phynes, Lucille M.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524125, 524139, 528176, 528272, 528275, 528286, C08G 6376

Patent

active

043749615

ABSTRACT:
This invention is a method of manufacturing heat-stable polyesters, characterized in that phosphonic acid compounds are added, when heat-stable polyesters with decreased terminal carboxyl groups are manufactured by reacting polyesters and cyclic carbonate compounds in the presence of an alkali halide compound catalyst.

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patent: 2863854 (1958-12-01), Wilson
patent: 3446766 (1969-05-01), Taylor
patent: 3489722 (1970-01-01), Kotani et al.
patent: 3509100 (1970-04-01), Stewart et al.
patent: 3657191 (1972-04-01), Titzmann et al.
patent: 4123420 (1978-10-01), Kyo et al.
patent: 4266046 (1981-05-01), Wu
patent: 4327207 (1982-04-01), Lazarus

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