Process for producing polyester resins

Details Process for producing polyester resins Process for producing polyester resins

2007-02-20

2007-02-20

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...

C528S279000, C528S283000, C528S286000, C528S300000, C528S302000, C528S308000, C528S308600, C528S406000, C524S706000, C524S710000, C524S755000, C524S765000, C524S791000, C521S048500

Reexamination Certificate

active

11076964

ABSTRACT:
In the invention, a polyester resin having 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 including 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 titanium compound to obtain an oligomer. The oligomer is then polymerized in the subsequent polymerization step to increase the molecular weight.

REFERENCES:
patent: 1164155 (2001-12-01), None
patent: 11411074 (2004-04-01), None
patent: WO95/21881 (1995-08-01), None

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