Process for producing polyester resins

Details Process for producing polyester resins Process for producing polyester resins

2007-02-27

2007-02-27

Acquah, Samuel A. (Department: 1711)

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

Synthetic resins

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

C528S300000, C528S302000, C528S308000, C528S308600, C525S437000, C524S406000, C524S755000, C524S765000, C524S783000, C524S791000

Reexamination Certificate

active

10998058

ABSTRACT:
In the invention, a polyester resin comprising dicarboxylic acid constitutional units and diol constitutional units wherein 5 to 60 mol % of the diol constitutional units has a cyclic acetal skeleton is produced by a process comprising an oligomerization step and a polymerization step. In the oligomerization step, an ester having a limited acid value is transesterified with a diol having a cyclic acetal skeleton in the presence of a basic compound to obtain an oligomer. The oligomer is then polymerized in the subsequent polymerization step to increase the molecular weight.

REFERENCES:
patent: 1 164 155 (2001-12-01), None
patent: 1 310 516 (2003-05-01), None
patent: 1 411 074 (2004-04-01), None
patent: WO 95/21881 (1995-08-01), None
European Search Report, for Application No. EP 04 10 5865, Feb. 21, 2005 (3 pp.).

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