Patent ID: 6455664
Filing Date: 2002-09-24
Classification: C08G

Abstract:
A process for producing PCCD polyester of the formula from a starting CHDM and a starting DMCD by reacting said CHDM and said DMCD in the presence of a catalyst to produce an aliphatic alcohol and an acid interchange oligomer, heating said acid interchange oligomer to form an intermediate low viscosity PCCD polymer having a viscosity from about 50 to about 1000 poise, and reacting the intermediate PCCD oligomer by solid state polymerization for increasing the molecular weight of said PCCD at a temperature from 180 to about 210 degrees Centigrade to form a PCCD having melting temperature of about 225 to about 234 degrees Centigrade and a viscosity from about 2,000 to about 20,000 poise.