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US 10,370,489 B2Granted
Polycarbonate composition having improved optical and thermal properties
AssigneeCovestro Deutschland AG
InventorsKarl-Heinz Köhler, Franky Bruynseels
Life of this patent
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Abstract
The invention relates to aromatic polycarbonates which comprise dioxydiarylcycloalkane structural units, and which have improved optical and thermal properties. It also relates to an improved process to produce the said polycarbonates from dihydroxydiphenylcycloalkanes, and also to mixtures of these polycarbonates with polymers, with fillers, with dyes and with conventional additives.
Claims9
Polycarbonate composition comprising at least one polycarbonate component comprising structural units of the general formula (I):
- where R1 and R2, independently of one another, are H, halogen, C1-C8-alkyl, C5-C6-cycloalkyl, C6-C10-aryl and C7-C12-arylalkyl, where m is 4 or 5, where R3 and R4 are freely selectable for each X and, independently of one another, are H or C1-C8-alkyl, where X is carbon, characterized in that the sulphur content in the composition is less than 2.0 ppm;
- characterized in that at least one of the polycarbonate components also comprises diphenols of the formula (III)
- where Z is an aromatic or alkylaromatic moiety.
Dependencies are inferred from the claim text.