Process for preparing aromatic carbonate polymers
AssigneeGeneral Electric Company
InventorJorgen Helm Vestergaard
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Abstract
A process for preparing a polycarbonate having improved resistance to thermal degradation and improved impact resistance by reacting a carbonate precursor such as phosgene with a dihydric phenol such as bisphenol-A in an aqueous medium while adding sufficient alkali metal hydroxide to maintain a pH of between 8.0 and 10.2 during the entire reaction.
Claims5
A process for preparing a carbonate polymer having improved resistance to thermal degradation and improved impact resistance, which process consists of reacting a carbonate precursor with 2,2-bis(4-hydroxyphenyl) propane in an aqueous medium containing sufficient alkali metal hydroxide to maintain a pH between 8.0-10.2 during the reaction.
Dependencies are inferred from the claim text.