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US 10,370,491 B2Granted
Preparation of highly heat-resistant (co)polycarbonates by the transesterification method
AssigneeCovestro Deutschland AG
InventorsIvan Sluijs, Jan Heijl, Erik Sluyts, Frank Bruynseels
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Abstract
The present invention relates to a melt transesterification process for the production of (co)polycarbonates from diaryl carbonates and cycloalkylidene diphenols, which process comprises the addition of a monohydroxyaryl compound in an amount of 5.0 to 20.0 wt.-%, based on the total mass of the reaction mixture. The invention further relates to a (co)polycarbonate obtained by the process.
Claims15
A process for preparing (co)polycarbonates by the melt transesterification method, the process comprising reacting at least one diaryl carbonate with a dihydroxyaryl compound of formula (1),
- wherein
- R1 is H or C1-C4-alkyl
- R2 is C1-C4-Alkyl, and
- n is 0, 1, 2 or 3;
- wherein the process further comprises the addition of a monohydroxyaryl compound which corresponds to the monohydroxyaryl compound that is generated by the transesterification of the diaryl carbonate;
- and
- wherein the monohydroxyaryl compound is added in an amount of 5.0 to 20.0 wt.-%, based on the total mass of the reaction mixture.
4 more elements
Dependencies are inferred from the claim text.