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公开(公告)号：EP2041202B1
公开(公告)日：2013-05-08
申请号：EP07784193.0
申请日：2007-05-30
发明人： BERNDSEN, Sjef , BRACK, Hans-Peter , JANSEN, Bernd , KAMPS, Jan Henk , KUNG, Edward , LOWERY, Daniel , MCCLOSKEY, Patrick Joseph , SMIGELSKI, Michael Paul , WILLEMSE, Dennis
CPC分类号： C08G64/307 , C08G64/14
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公开(公告)号：EP2041202A1
公开(公告)日：2009-04-01
申请号：EP07784193.0
申请日：2007-05-30
发明人： BERNDSEN, Sjef , BRACK, Hans-Peter , JANSEN, Bernd , KAMPS, Jan Henk , KUNG, Edward , LOWERY, Daniel , MCCLOSKEY, Patrick Joseph , SMIGELSKI, Michael Paul , WILLEMSE, Dennis
CPC分类号： C08G64/307 , C08G64/14
摘要： A method for preparing a molded article includes the steps of (a) obtaining a polycarbonate resin and (b) molding the polycarbonate resin. The polycarbonate resin is made by a transesterification reaction using an activated diaryl carbonate such that the polycarbonate is susceptible to the formation of internal ester linkages (IEL). The method occurs with the proviso that the polycarbonate resin, the molding conditions or both are selected to control the amount of IEL formed during the molding process to a level of less than 0.4 mol%.
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公开(公告)号：EP2021315A1
公开(公告)日：2009-02-11
申请号：EP07761984.9
申请日：2007-05-08
CPC分类号： C07C67/58 , B01J2219/00006 , C07C68/02 , C08G64/205 , C08G64/307 , C07C69/96 , C07C69/84
摘要： An improved method for the preparation of ester-substituted diaryl carbonates prepared by reacting phosgene with recycle streams of ester-substituted phenols from reaction processes using a tetraalkyl ammonium hydroxide catalyst, a tetraalkyl phosphonium hydroxide catalyst, or both, where at least one alkyl group of the tetraalkyl ammonium hydroxide or the tetraalkyl phosphonium hydroxide is a methyl group. The improvement includes the step of treating the recycle stream to reduce the concentration of a trialkyl amine, trialkyl phosphine, or both, if present, from the recycle stream prior to reacting it with phosgene to form the ester-substituted diaryl carbonate.
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