PROCESS FOR THE PRODUCTION OF POLYCARBONATE USING AN ESTER SUBSTITUTED DIARYL CARBONATE

Dennis Willemse (Inventor), Hatem Belfadhel (Inventor), Hans-Peter Brack (Inventor), Vic Fernandez Ignacio (Inventor), Jorge Garcia Agudo (Inventor), Joris De Grooth (Inventor), Gerardo Hidalgo Llinas (Inventor), Joseph McCloskey Patrick (Inventor), Louis Obando (Inventor), Herke Oyevaar Martin (Inventor), Laurus Van Der Wekke (Inventor)

Research output: Patent

Abstract

A method of preparing polycarbonate includes a steps of providing a melt reaction mixture and allowing the melt reaction mixture to react to build molecular weight, thereby preparing the polycarbonate. The melt reaction mixture has a dihydroxy compound, an ester substituted diaryl carbonate mixture, and a melt transesterification catalyst where the ester substituted diaryl carbonate mixture may contain acid-substituted phenol. The method also includes the step of adjusting the molar ratio of acid-substituted phenol, if present, to melt transesterification catalyst (acid-substituted phenol/catalyst) in the melt reaction mixture to an amount of less than 10.

Original languageEnglish
Patent numberUS2008287640
IPCC08G 64/ 30 A I
Priority date15/05/07
Publication statusPublished - 20 Nov 2008

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