Branched melt polycarbonate with low proportion of faulty structures

摘要

Aromatic branched polycarbonates (I), produced by transesterification of bisphenols with diarylcarbonates in melt transesterification process using a branching agent, are new, where the ratio of the branching agent to sum of xanthen-9-one compounds (D) in the melt polycarbonate is 800-200, and the content of (D) is 5-450 mg/kg. Aromatic branched polycarbonates (I), produced by transesterification of bisphenols with diarylcarbonates in melt transesterification process using a branching agent, are new, where the ratio of the branching agent to sum of xanthen-9-one compounds of formula (D) in the melt polycarbonate is 800-200, and the content of (D) is 5-450 mg/kg. X : single bond, 1-6C-alkylene, 2-5C-alkylidene or 5-6C-cycloalkylidene, which is optionally substituted with 1-6C-alkyl, preferably methyl or ethyl. An independent claim is included for a composition comprising (I) and at least one organic phosphorus compound comprising phosphine, phosphite, diphosphite or phosphate. [Image].