Shell Oil Comapny

Jan Kuyper

George A Pogany

Peter William Lednor

Paulina Van Schaik-Struykenkamp

Harm Van Der Hulst

Process for the preparation of polycarbonates by reacting at least one epoxy compound with carbon dioxide at 40.degree. to 200.degree. C. and 2 to 40 bar in the presence of a catalytic amount of a double metal cyanide complex and

Process for the preparation of polycarbonates

Process for the preparation of polycarbonates by reacting at least one epoxy compound with carbon dioxide at 40.degree. to 200.degree. 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.degree. C., and/or (b) one or more no-metal containing acids of which a 0.1 N solution in water at 25.degree. C. has a pH not exceeding 3.

Process for the preparation of polycarbonates from epoxy compound and

Catalysts for the polymerization of epoxides and process for the

A process for the polymerization of epoxides using as catalyst a double metal cyanide-type compound is described wherein said process is carried out in the presence of at least

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Amsterdam, Netherlands

Jan Kuyper