Method for producing polyoxymethylene polyoxyalkylene copolymers
AssigneeCovestro Intellectual Property GmbH & Co. KG
InventorsJens Langanke, Aurel Wolf, Christoph Guertler
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Abstract
A method for producing a polyoxymethylene polyoxyalkylene copolymer, comprising reacting a polymer formaldehyde compound with an alkylene oxide in the presence of a double metal cyanide (DMC) catalyst, wherein the polymer formaldehyde compound comprises at least one terminal hydroxyl group and wherein the method comprises the steps of placing a suspending agent in a reactor and subsequently incrementally or continuously metering in the polymer formaldehyde compound into the reactor during the reaction is provided.
Claims13
A process for preparing a polyoxymethylene-polyoxyalkylene copolymer, the process comprising reacting a polymeric formaldehyde compound with an alkylene oxide in the presence of a double metal cyanide (DMC) catalyst;
- wherein the polymeric formaldehyde compound has at least one terminal hydroxyl group;
- wherein the process comprises the steps of:
- (α) initially charging a suspension medium into a reactor;
- and
- (γ) stepwise or continuous metered addition of the polymeric formaldehyde compound into the reactor during the reaction.
Dependencies are inferred from the claim text.