Process for preparing halogen-substituted aromatic...

Details Process for preparing halogen-substituted aromatic... Process for preparing halogen-substituted aromatic...

C - Chemistry, Metallurgy

08

G

402/174, 402/33,

C08G 75/00 (2006.01) C08G 63/66 (2006.01) C08G 64/08 (2006.01) C08G 64/24 (2006.01) C08G 64/28 (2006.01)

Patent

CA 1036744

Abstract of the Disclosure A process is provided for making high molecular weight halo-substituted aromatic polycarbonates in a phase boundary reaction in which an o,o,o',o'-tetrahalogenobisphenol and phosgene are reacted in an aqueous medium at a pH of 7 to 9 in the presence of from 2 mol% to 20 mol% catalyst in a first step and the resulting product is polycondensed at a pH at least about 13 in a second step.

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