Process for the production of melt polycarbonate compositions

Process for the production of melt polycarbonate compositions

In an embodiment, a process for making a polycarbonate composition by a melt polymerization process can comprise: melt polymerizing reactants to produce a molten reaction product; filtering the molten reaction product prior to any extruding; and extruding the molten reaction product to form the poly...

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1. Verfasser: Vic Fernández, Ignacio
Format: Patent
Sprache:eng ; fre ; ger
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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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creator Vic Fernández, Ignacio
description In an embodiment, a process for making a polycarbonate composition by a melt polymerization process can comprise: melt polymerizing reactants to produce a molten reaction product; filtering the molten reaction product prior to any extruding; and extruding the molten reaction product to form the polycarbonate composition. In another embodiment, a melt polymerization process can comprise: melt polymerizing a dihydroxy reactant and a carbonate compound in the presence of a catalyst to produce a molten reaction product; and upstream of all extruders, removing gels having a particle size of greater than or equal to 0.5 micrometers from the molten reaction product; and extruding to produce the polycarbonate composition. A melt polymerization unit can comprise: a polymerization vessel for melt polymerizing a dihydroxy reactant and a carbonate compound to produce a molten reaction product, a melt filter, and an extruder. The melt filter is located upstream from the extruder.
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subjects 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
title Process for the production of melt polycarbonate compositions
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