Shell Oil Comapny

George A Pogany

Jan Kuyper

Peter William Lednor

Peter Dix

Parminder Singh Sangha

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

Process for the manufacture of a polyether polyol by reaction between an organic compound containing 2 or more active hydrogen atoms in the molecule and an alkylene oxide in the presence of a catalyst comprising a tertiary amine NRR'.sub.2, in which R is a cycloalkyl or cycloalkenyl group and each R' may be an alkyl, cycloalkyl or cycloalkenyl group.

Polyether polyol process

A process for the preparation of polyethers by reaction between a polyol reactant having a melting point above 80.degree. C. and alkylene oxide, during which a substantially continuous flow of alkylene oxide is passed through a bed of the polyol. The polyether products find particular application, for instance, in the manufacture of polyurethanes.

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Amsterdam, Netherlands

George A Pogany