A method for the production of polycarbonate according to the melt transesterification process

摘要

A method for the production of polycarbonate according to the melt transesterification process, wherein at least one dihydroxyaryl compound, with at least one of the diaryl carbonate with the use of at least one catalyst are reacted in a multistage process, characterized in that the melt before the final stage of at least one inhibitor is added and after the last reaction step, one or more aromatic hydroxycarboxylic acids or their derivatives are added, wherein the or the aromatic hydroxycarboxylic acid (n) or its derivative (s) in order to one or more connection (s) of the general formula (vi), (vii) or (viii) are, whereinR¹, R^1' for h,R², R^2' independently of one another represent a linear or branched c₁-C.₁₀-Alkyl -, c₆-C.₃₄-Aralkyl radical, preferably for a linear or branched c₁-C.₄-Alkyl radical,R³, R^3' independently of one another, h, a linear or branched c₁-C.₁₀-Alkylcarbonyl - or c₆-C.₃₄-Aryl carbonyl radical, preferably h or a methyl carbonyl -, ethylcarbonyl -, propylcarbonyl -, phenylcarbonyl -, butyl carbonyl radical, and very particularly preferably h or a methyl carbonyl radical,R⁴ for h,l for 1 or 2, preferably for 1,n is 0 or an integer from 1 to 3, preferably 0 or 1,m is 1 or 2, preferably for 1,Y for a from 1 to 8 c - and / or hetero - atoms existing divalent radical, preferably for - c (r⁵)(R⁶)-, -(Cr⁵R⁶)_m-, -O -, - s -, - s (= o) -, - s (= o)₂-, -(C = o) -, - o (c = o) o -, - o - c (r⁵R⁶)O -, in particular preferred for - c (r⁵)(R⁶)- , where r.sup.1⁵ and r⁶ independently of one another represent a c₁-C.₁₀-Alkyl radical, preferably a c₁-C.₆-Alkyl radical, particularly preferably stand for methyl, andX represents a c₁-C.₁₀-Alkyl -, c₁-C.₁₀-Alkylphenyl - or a phenyl radical, particularly preferably a phenyl radical.