Process for the preparation of polycarbonate and/or...

Details Process for the preparation of polycarbonate and/or... Process for the preparation of polycarbonate and/or...

C - Chemistry, Metallurgy

08

G

C08G 81/00 (2006.01) C08G 63/672 (2006.01) C08G 64/18 (2006.01)

Patent

CA 2030560

The invention describes a novel process for the preparation of polycarbonate and/or polyarylate block copolymers with poly(aryl ethers). The process is comprised of steps: (a) the reaction of a dihydroxy-terminated poly(aryl ether) oligomer with a high molecular weight polycarbonate, or a high molecular weight polyarylate, or a high molecular weight poly(arylate-carbonate) to yield a block copolymer; followed by (b) the coupling of the material obtained in step (a) to the required molecular weight, us- ing a diaryl ester of carbonic acid or of a dicarboxylic acid. Both steps are performed in the presence of a catalyst. The copolym- erizations can be run in bulk under vacuum in a single or twin screw extruder. Using the above conditions high molecular weight, high quality block copolymers having a combination of excellent properties are obtained in a matter of minutes.

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