Method for producing elastomeric copolyesters

Details Method for producing elastomeric copolyesters Method for producing elastomeric copolyesters

2005-02-23

2010-11-09

Choi, Ling-Siu (Department: 1796)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S271000, C528S272000, C528S297000, C528S301000, C528S307000, C528S491000, C528S497000, C528S498000, C526S072000, C526S077000, C540S538000, C525S010000, C525S050000

Reexamination Certificate

active

07829654

ABSTRACT:
A process for continuous or discontinuous synthesis of elastomeric copolyesters from polybutylene terephthalate (PBT) and polyoxytetramethylene glycol is described in which the tetrahydrofuran (THF) obtained as a byproduct in synthesis of polybutylene terephthalate from 1,4-butanediol is rectified and then reacted by ring-opening polymerization to form polyoxytetramethylene glycol which condenses with the free or esterified carboxyl groups of PBT to form the copolyester, whereby chain termination and catalyst deactivation are accomplished by adding 1,4-butanediol without separating the catalyst.

REFERENCES:
patent: 3050533 (1962-08-01), Maclean et al.
patent: 4081494 (1978-03-01), Sakai
patent: 06057630 (1994-03-01), None
patent: 08231706 (1996-09-01), None
patent: WO9511267 (1995-04-01), None
Machine translation of JP 06-057630.
Machine translation of JP 08-231706.

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