Process for the production of polyester resins

Details Process for the production of polyester resins Process for the production of polyester resins

1997-07-15

1999-05-11

Short, Patricia A.

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

Synthetic resins

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

528296, 528486, C08G63/80;63/91

Patent

active

059028645

ABSTRACT:
Process for the production of aromatic polyester resins starting from resins with an IV from 0.1 to 0.4 dl/g comprising the steps of blending the resin with a dianhydride of a tetracarboxylic acid, extruding the resin under the form of a strand, cooling the strand or the chips obtainable by cutting the strand, at a temperature between 150.degree. C. and 210.degree. C. and maintaining the same temperature for sufficient time to obtain a crystalline product wherein the DSC curves of the same do not show presence of premelt peaks or only in a negligible amount.

REFERENCES:
patent: 4224264 (1980-09-01), Ort et al.
patent: 5334669 (1994-08-01), Ghisolfi
patent: 5376734 (1994-12-01), Al Ghatta
patent: 5510454 (1996-04-01), Stouffer et al.

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