Process for the manufacture of unsaturated polyester resins

摘要

Disclosed is a process for producing styrene-soluble unsaturated polyester resins from DMT process residue. In a preferred embodiment of the process, DMT process residue is transesterified with propylene glycol until a hydroxyl-terminated ester product having a methoxyl content within a specified range is formed and then the resulting ester product is esterified with maleic anhydride.