PRODUCTION OF HIGH-MOLECULAR POLYESTER, AND SHEET, COATING, PROFILE, PIPE, HOLLOW BODY, AND MOLDED MEMBER PRODUCED FROM SAME

摘要

The object is to prepare a high-molecular-weight polyester in such a way that it is advantageously possible to produce even relatively small amounts of very high molecular weight in a very short time. This is achieved by the preparation of a polyester having an alkenediol content by continuing the polycondensation step to a viscosity number of from 50 to 140 cm<3>/g and subsequently subjecting the resultant polyester to solid phase postcondensation until the requisite viscosity number has been reached. The novel process enables high-molecular-weight polyesters having the desired property profile to be obtained.