Process for preparing high molecular weight polyesters

Details Process for preparing high molecular weight polyesters Process for preparing high molecular weight polyesters

1996-07-30

1997-09-02

Mosley, Terressa

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

Synthetic resins

From carboxylic acid or derivative thereof

528176, 528190, 528191, 528192, 528193, 528194, 528271, C08G 6302

Patent

active

056632819

ABSTRACT:
An improved process for preparing high molecular weight polyester polymers, such as poly(butylene terephthalate), an alkylene glycol and a di- or tricarboxylic acid by first preparing a pre-polymer in the form of uniform solid particles having an intrinsic viscosity of from 0.1 to about 0.3 dL/gm and a chemical composition which contains greater than a 1% stoichiometric excess of the alkylene glycol above the amount required to produce a high molecular weight polymer, and polymerizing the pre-polymer in the solid state.

REFERENCES:
patent: 4590259 (1986-05-01), Kosky et al.
patent: 5015759 (1991-05-01), Lowe

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