Preparation of thermoplastic polyesters

Details Preparation of thermoplastic polyesters Preparation of thermoplastic polyesters

1996-04-17

1997-03-11

Acquah, Samuel A.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

528275, 528302, 528307, 528308, 5283086, 524765, 524777, C08K 308, C08G 6383

Patent

active

056102313

ABSTRACT:
Thermoplastic polyesters are prepared by multistage polycondensation of dihydroxy compounds with dicarboxylic acids or esters or ester-forming derivatives thereof by a process in which, in at least one first stage, an alkali metal compound or an alkaline earth metal compound is added in an amount of from 1 to 10 mmol, calculated as alkali metal or alkaline earth metal, per kg of polyester, and at least one further stage is carried out as a solid-phase condensation.

REFERENCES:
patent: 4107149 (1978-08-01), Bier et al.
patent: 4705844 (1987-11-01), Espenschied et al.
patent: 4845186 (1989-07-01), Chujo et al.

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