| US 7,589,165 B2 | ||
| Polycarbonates having a good wettability | ||
| Alexander Meyer, Düsseldorf (Germany); Wilfried Haese, Odenthal (Germany); Stephan Konrad, Dormagen (Germany); and Claus-Ludolf Schultz, Krefeld (Germany) | ||
| Assigned to Bayer Material Science AG, (Germany) | ||
| Filed on Dec. 20, 2005, as Appl. No. 11/312,153. | ||
| Claims priority of application No. 10 2004 061 714 (DE), filed on Dec. 22, 2004. | ||
| Prior Publication US 2006/0135736 A1, Jun. 22, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C08G 64/00 (2006.01); C08G 63/02 (2006.01) | ||
| U.S. Cl. 528—196 [264/176.1; 264/219; 369/47; 369/59.11; 369/59.24; 428/411.1; 428/412; 502/150; 528/198] | 19 Claims |
| 1. A polycarbonate resin produced by a continuous interfacial process wherein the resin contains
0.2 to 300 ppm of one or more compounds conforming structurally to formula (I)
 wherein
R1 and R2 independently of one another denote hydrogen or C1-C12-alkyl, or together denote C4-C12-alkylidene,
R3 and R4 independently of one another represent hydrogen or C1-C12-alkyl, or phenyl, or together with carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, and
R5 denotes hydrogen, C1-C12-alkyl, C5C12-cycloalkyl, phenyl or cumyl,
wherein the content is measured in acetone extract by chromatography by means of HPLC
wherein the process comprises reacting at least one bisphenol with an excess of 5 to 17 mol % of phosgene (based on the total
of bisphenols employed) wherein the reaction has a pH is in the alkaline range and a temperature of 0 to 40° C.
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