Zweistufenverfahren zur Herstellung von thermoplastischem Polycarbonat

A 2-stage melt-transesterification process for the production of polycarbonate (PC) with a low degree of branching, comprising (1) addition of 10 to 10 mol (based on 1 mol diphenol) of a nitrogen or phosphorus base as catalyst to a mixture of diphenol and diaryl carbonate, heating the mixture to up...

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Bibliographische Detailangaben
Hauptverfasser:	HUCKS, UWE., 46519 ALPEN, DE, ULLRICH, MARTIN., 51375 LEVERKUSEN, DE, FISCHER, THOMAS. DR., 47809 KREFELD, DE, SCHEBESTA, KLAUS., 51371 LEVERKUSEN, DE, ZABY, GOTTFRIED. DR., 51375 LEVERKUSEN, DE, KUEHLING, STEFFEN. DR., 40670 MEERBUSCH, DE, SCHUCHARDT, HEINRICH., 51373 LEVERKUSEN, DE, BACHMANN, ROLF. DR., 51469 BERGISCH GLADBACH, DE, KOHLGRUEBER, KLEMENS. DR., 51515 KUERTEN, DE, RHIEL, FRANZ-FERDINAND. DR., 41540 DORMAGEN, DE
Format:	Patent
Sprache:	ger
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A 2-stage melt-transesterification process for the production of polycarbonate (PC) with a low degree of branching, comprising (1) addition of 10 to 10 mol (based on 1 mol diphenol) of a nitrogen or phosphorus base as catalyst to a mixture of diphenol and diaryl carbonate, heating the mixture to up to 290 degrees C at a pressure of from 100 Pa to atmospheric pressure with distillation of the monophenol produced, to give oligo-carbonate (OC) with an OH end group content of 10-35 mol%, and (2) polycondensation of OC at 240-340 (preferably 275-330, more preferably 280-310) degrees C and 1-50,000 Pa for 10-60 mins. in a self-cleaning high-viscosity reactor with a surface-related degree of self-cleaning of more than 95% and a free useful vol. of at least 50%.