Inhibition of catalytically active impurities in polycarbonate by the transesterification process melt.

摘要

Process for the preparation of polycarbonate, characterized in that esters of organic sulfur-containing acids selected from at least one compound a) of formula (I) are added ** (See formula) ** wherein R1 independently represents hydrogen or C1- C20 unsubstituted or substituted by halogen, R2 and R3 independently represent hydrogen, C1-C6 alkyl or alkyl alkyl C4-C30-carboxyl or represents the radical ** (See formula) ** in which R1 has the abovementioned meaning above, m represents 0 or 1, n represents an integer from 0 to 8, b) of formula (IV) ** (See formula) ** wherein R1 and n have the abovementioned meaning and R4 represents alkyl C4- C30 carboxyl, or represents the following moiety ** (See formula) ** wherein R1 has the above meaning, c) of formula (V), (VI), (VIIa), (VIIb), (Ib) , (IVb) ** (See formula) ** ** (See formula) ** wherein R1 and n have the abovementioned meaning Mencio swimming, q represents an integer of 0 to 10, R5 and R6 independently represent hydrogen or C1-C20 alkyl may be halogen-substituted alkyl, and R11 independently represents hydrogen or di- (C1-C4) alkylamino, between reactors medium and high viscosity.