Process for preparing high-molecular weight polyesters

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

1994-08-22

1995-11-21

Short, Patricia A.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

528274, 528308, 5283087, 5283088, 528491, 528503, C08G 6380

Patent

active

054684412

ABSTRACT:
A high-molecular-weight polyester is prepared by polycondensing an aromatic dicarboxylic acid with a mixture of alkanediols and alkenediols with substantial exclusion of oxygen and in the presence of a catalyst, until a viscosity number in the range from 50 to 140 cm.sup.3 /g is reached and then postcondensing the polycondensed material in the solid-phase until the required viscosity number is reached.

REFERENCES:
patent: 4973655 (1990-11-01), Pipper

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