MELT POLYMERIZATION PROCESS FOR INCREASING THE MODECULAR WEIGHT OF POLY(1,4-BUTYLENE amp; EREPHTHALETE)

摘要

A novel melt polymerization process is disclosed for increasing the molecular weight of poly(1,4-butylene terephthalate). This process comprises adding a compound containing at least two aliphatic or cycloaliphatic hydroxyl groups to a low molecular weight poly(1,4-butylene terephthalate) and thereafter melting the polymer in a vacuum until the desired molecular weight is reached.