A method for the production of high molecular weight polymers, synthetic, linear poly ester polymers

摘要

In the process for continuous production of highly polymeric synthetic linear polyester polymers, where ethylene glycol and terephthalic acid are reacted to form bis(beta hydroxy) ethyl terephthalate and low molecular weight polymer and thereafter subjected to polycondensation - the improvement is provided wherein a first phase of esterification is conducted at about 0-5 psig (0-0.35 kg/cm2 gauge) pressure through about 75-95% of esterification; during which water is easily removed, as is a substantial amount of ethylene glycol; and a second phase conducted at a pressure substantially higher than the first phase during which percent of esterification is increased to about 95-99%.