Process for the preparation of polycarbonates

Details Process for the preparation of polycarbonates Process for the preparation of polycarbonates

C - Chemistry, Metallurgy

08

G

402/172, 403/43

C08G 64/34 (2006.01) C08G 18/44 (2006.01)

Patent

CA 1262597

A B S T R A C T PROCESS FOR THE PREPARATION OF POLYCARBONATES Process for the preparation of polycarbonates by reacting at least one epoxy compound with carbon dioxide at 40 to 200°C and 2 to 40 bar in the presence of a catalytic amount of a double metal cyanide complex and a) one or more salts composed of at least bivalent metal ions and metal-free anions having a solubility in water of at least 1 g/100 ml at 25 °C, and/or b) one or more no-metal containing acids of which a 0.1 N solution in water at 25 °C has a pH not exceeding 3.

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