METHOD FOR THE PREPARATION OF POLYCARBONATE BY THE METHOD OF TRANSESTERFIICATION IN THE MELT, POLYCARBONATE, DERIVED THEREBY, AND ITS APPLICATION

摘要

1. A process for producing a polycarbonate according to the melt transesterification method, wherein at least one compound dihydroxyarenes converted with at least one diaryl carbonate using at least one catalyst in a multistage process, characterized in that to the melt before the last reaction stage is added at least inhibitor and at the last, or after the last reaction stage is added one or more aliphatic hydroxydicarboxylic acids and / or hydroxy-polycarboxylic acids or their pro zvodnye. ! 2. A method according to claim 1, characterized in that under the aliphatic or aliphatic hydroxydicarboxylic acids and / or a hydroxy (s), acid (s) or derivatives thereof is meant one or more compounds of general formula (VI) or (VII)! ! ! wherein R1, R2, R3 each independently represent a linear or branched, preferably linear alkylene residue having from 1 to 10 carbon atoms, particularly preferably a linear or branched, preferably linear alkylene residue having from 1 to 6 carbon atoms! X1, X2, X3, independently of one another denote hydrogen or OH, whereby at least one of residues X1, X2, X3 is OH,! W is hydrogen, COOH, carboxylate or alkylcarboxyl, preferably -COOH,! n is an integer from 1 to 3, preferably 1,! m is 0 or an integer from 1 to 3, preferably 0 or 1,! o is 0 or an integer from 1 to 3, preferably 0 or 1,! R4, R5 independently of one another are linear or branched alkyl residue having from 1 to 10 carbon atoms, preferably a linear or branched alk residue