Patent ID: 8796355

Claim:
A thermoplastic composition comprising a. a thermoplastic polyester selected from the list consisting of polyethylene terephthalates, polyalkylene naphthalates, polyalkylene dibenzoates or mixtures of at least two of these thermoplastic polyesters, b. a mold release agent, and c. optionally further additives, wherein the mold release agent comprises an ester of at least one alcohol component based on two or more glycerol units, the alcohol component being selected from a diglycerol, a triglycerol or a tetraglycerol; and at least one carboxylic acid or a derivative of a carboxylic acid or both, the carboxylic acid or the derivative of a carboxylic acid comprising a number of carbon atoms in a range of from 6 to 26; wherein a metal catalyst which is a high-temperature catalyst is used during esterification wherein the high-temperature catalyst achieves full activity at a temperature of greater than 180° C.; and wherein the thermoplastic composition comprises less than 0.001% by weight of a saturated, α-olefin oligomer of at least one C 6 -C 18 α-olefin.