Polyesters production process

Details Polyesters production process Polyesters production process

1996-04-16

1997-02-04

Acquah, Samuel A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528272, 528274, 528279, 528283, 528285, 5283083, 5283086, 528481, 528489, 528492, 528503, 525437, 525444, C08F 600

Patent

active

055999000

ABSTRACT:
An atmospheric pressure process for the continuous production of polyester is disclosed wherein a melt of bis(3-hydroxy propyl) terephthalate, or its low molecular oligomers, obtained by esterifying terephthalic acid or transesterifying dimethyl terephthalate with propylene glycol, is intimately contacted with an inert gas to facilitate polymerization and removal of the reaction byproducts. The propylene glycol evolved and the inert gas are recycled.

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patent: 3110547 (1963-11-01), Emmert
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patent: 3469618 (1969-09-01), Siclari et al.
patent: 3545520 (1970-12-01), Siclari et al.
patent: 3594356 (1971-07-01), Hinton
patent: 4835293 (1989-05-01), Bhatia

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