Patent ID: 8202961
Filing Date: 2012-06-19
Classification: C08G

Abstract:
1. A continuous interfacial process for preparing linear or branched polycarbonate having an inhomogeneity factor comprising the step of preparing said polycarbonate from an alkylphenol of formula (1) wherein R1 and R2 independently of one another represent hydrogen, C1-C8-alkyl, C6-C12-aryl, phenyl-C1-C6-alkyl or naphthyl-C1-C6-alkyl, but wherein R1 and R2 cannot simultaneously be hydrogen, wherein the inhomogeneity factor for various molecular weight ranges is as follows: for low-viscosity polycarbonate having an average molecular weight (weight-average) of from 18,000 to 22,000 g/mol, U is 1.08 to 1.18, for medium-viscosity polycarbonate having an average molecular weight (weight-average) of greater than 22,000 to 26,000 g/mol, U is 1.18 to 1.60, for high-viscosity polycarbonate having an average molecular weight (weight-average) of greater than 26,000 to 40,000 g/mol, U is 1.30 to 1.75.