07482423 is referenced by 4 patents and cites 53 patents.

Polycarbonates incorporating terminal carbonate groups derived from ester-substituted activated carbonates, for example terminal methyl salicyl carbonate (TMSC) derived from the use of BMSC as the activated carbonate in a transesterification process, have unfavorable properties with respect to color, hydrolytic stability and thermal stability, particularly when the polycarbonate containing such end groups is molded. The number of activated carbonate end groups formed during the melt transesterification formation of polycarbonate can be reduced, however, without sacrificing the benefits of using an activated diaryl carbonate, and without requiring a separate reaction or additional additives by reacting a dihydroxy compound with an activated diaryl carbonate in the presence of an esterification catalyst to produce a polycarbonate, wherein the molar ratio of activated diaryl carbonate to dihydroxy compound is less than 1 when expressed to at least three decimal places, for example 0.996 or less.

Title
Polycarbonates and method of preparing same
Application Number
11/427861
Publication Number
7482423 (B2)
Application Date
June 30, 2006
Publication Date
January 27, 2009
Inventor
Paul Michael Smigelski Jr
Schenectady
NY, US
Patrick Joseph McCloskey
Watervliet
NY, US
Edward Kung
Bergen op Zoom
NL
Jan Henk Kamps
Bergen op Zoom
NL
Bernd Jansen
Bergen Op Zoom
NL
Agent
Marina Larson & Associates
Assignee
Sabic Innovative Plastics IP
NL
IPC
C08G 63/02
C08G 64/00
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