Patent ID: 7115700
Filing Date: 2006-10-03
Classification: C08G,C08L

Abstract:
1. A polycarbonate prepared by melt polymerization reaction of an ester-substituted diaryl carbonate with a dihydroxy aromatic compound, said polycarbonate comprising repeat units derived from the dihydroxy aromatic carbonate coupled via internal carbonate and ester carbonate linkages, and terminal hydroxyl and hydroxyl ester groups, wherein said polycarbonate has: (a) a weight average molecular weight of between 10,000 and 100,000 Dalton; (b) less than 1% of chain ends bearing free hydroxy groups, less than 100 parts per million Fries product; (c) less than 1 mole percent of internal ester carbonate linkages relative to total number of moles of dihydroxy aromatic compound reacted; and (d) less than 1 mole percent of terminal hydroxy ester groups relative to total number of moles of dihydroxy aromatic compound reacted.