摘要 |
<p>Polycarbonates containing low or undetectable levels of Fries rearrangement products and comprising repeat units derived from one or more of resorcinol, hydroquinone, methylhydroquinone, bisphenol A, and 4,4'-biphenol have been prepared by the melt reacti on of one or more of the aforementioned dihydroxy aromatic compounds with an ester-substituted diaryl carbonate such as bis-methyl salicyl carbonate. Low, or in many instances undetectable, levels of Fries rearrangement products are found in the product polycarbonates obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reactions using diphenyl carbonate.</p> |
申请人 |
GENERAL ELECTRIC COMPANY;MCCLOSKEY, PATRICK, JOSEPH;LENS, JAN, PLEUN;CELLA, JAMES, ANTHONY;KAMPS, JAN, HENK;LONGLEY, KATHRYN, LYNN;RAMESH, NARAYAN;REILLY, WARREN, WILLIAM;SMIGELSKI, PAUL, MICHAEL, JR.;WISNUDEL, MARC, BRIAN |
发明人 |
MCCLOSKEY, PATRICK, JOSEPH;LENS, JAN, PLEUN;CELLA, JAMES, ANTHONY;KAMPS, JAN, HENK;LONGLEY, KATHRYN, LYNN;RAMESH, NARAYAN;REILLY, WARREN, WILLIAM;SMIGELSKI, PAUL, MICHAEL, JR.;WISNUDEL, MARC, BRIAN |