Method of manufacturing polycarbonate using the melting ester interchange method

Preparing polycarbonate by the melt transesterification involves, reacting a dihydroxyaryl compound with a diarylcarbonate in the presence of catalyst in a multistage process; where at least one inhibitor is added to the melt before the last reaction stage and at least one aliphatic hydroxydicarboxy...

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Bibliographische Detailangaben
Hauptverfasser:	HAESE, WILFRIED DR, MEYER, ALEXANDER DR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	Preparing polycarbonate by the melt transesterification involves, reacting a dihydroxyaryl compound with a diarylcarbonate in the presence of catalyst in a multistage process; where at least one inhibitor is added to the melt before the last reaction stage and at least one aliphatic hydroxydicarboxylic acid(s) and/or hydroxypolycarboxylic acid(s) or its derivative(s) are added in or after the last reaction stage. An independent claim is included for an optical disc having mean electric field strength of -20 to +20 kV/m and a field strength variation of less than 15 kV/m and comprising the polycarbonate containing at least one aliphatic hydroxydicarboxylic acid and/or hydroxypolycarboxylic acid or its derivative (5-500 parts per million (ppm)), and a phenolic terminal OH groups content of greater than 150 ppm.