Process for preparing a branched polycarbonate

Details Process for preparing a branched polycarbonate Process for preparing a branched polycarbonate

C - Chemistry, Metallurgy

08

G

402/172

C08G 64/14 (2006.01) C08G 63/64 (2006.01)

Patent

CA 1062845

ABSTRACT OF THE DISCLOSURE A process for preparing a thermoplastic randomly branched aromatic polycarbonate which process comprises reacting at least 20 weight percent of a stoichiometric quantity of a carbonate precursor with a mixture of a dihydric phenol and at least 0.05 mole percent of a poly- functional aromatic compound in a medium of water and a solvent for the polycarbonate having present therein at least 1.2 mole percent of a polymerization catalyst, while concomitantly adding to the reaction medium sufficient alkali metal hydroxide to maintain a pH range of about 3.0 to about 6.0, and then adding sufficient alkali metal hydroxide to raise the pH to at least about 9.0 to less than about 12 while reacting the remaining carbonate precursor.

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