A SYSTEM AND PROCESS FOR PRODUCING VARIOUS MOLECULAR WEIGHT MELT POLYCARBONATES

In an embodiment, a melt polymerization process comprises melt polymerizing a carbonate compound and dihydroxy compound in the presence of a catalyst composition to form a polymerized polycarbonate, wherein the catalyst composition comprises an alkali catalyst and/or a quaternary catalyst; after a f...

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Bibliographische Detailangaben
1. Verfasser:	FERNANDEZ Ignacio Vic
Format:	Patent
Sprache:	eng
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:	In an embodiment, a melt polymerization process comprises melt polymerizing a carbonate compound and dihydroxy compound in the presence of a catalyst composition to form a polymerized polycarbonate, wherein the catalyst composition comprises an alkali catalyst and/or a quaternary catalyst; after a final polymerization, adding a chain scission agent to the polymerized polycarbonate to reduce a molecular weight of the polymerized polycarbonate to form a modified polycarbonate having a molecular weight that is less than the molecular weight of the polymerized polycarbonate.