| 摘要 |
Aromatic branched polycarbonate prepared by transesterifying bisphenols with diaryl carbonates in melt transesterification process using branching agents, is new. The ratio of internal branching agent and sum of xanthen-9-one derivative (I) in melt polycarbonate is 8-200. The content of (I) is 5-450 mg/kg. Aromatic branched polycarbonate prepared by transesterifying bisphenols with diaryl carbonates in melt transesterification process using branching agents, is new. The ratio of internal branching agent and sum of xanthen-9-one derivative of formula (I) in melt polycarbonate is 8-200. The content of (I) is 5-450 mg/kg. X : 1-6C alkylene, 2-5C alkylidine, 5-6C cycloalkylidene (all substituted by 1-6C alkyl, preferably CH 3or ethyl) or single bond. An independent claim is also included for a composition comprising at least one above mentioned polycarbonate and at least one organophosphorus compound comprising phosphines, phosphites, diphosphites or phosphates. [Image]. |
