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US 2023/0212352 A1Published application
Process for producing polyoxymethylene-polyoxyalkylene copolymers
AssigneeCovestro Deutschland AG
InventorsAurel Wolf, Mike Schuetze, Christoph Guertler
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Abstract
A process for producing a polyoxymethylene-polyoxyalkylene copolymer is provided. The process comprises reacting a polymer formaldehyde compound of an alkylene oxide and a specific component (X) in the presence of a double metal cyanide (DMC) catalyst. A polyoxymethylene-polyoxyalkylene copolymer can be obtained by means of such a process and to the use of same for producing a polyurethane polymer.
Claims20
A process for preparing a polyoxymethylene-polyoxyalkylene copolymer, the process comprising:
- reacting a polymeric formaldehyde compound of an alkylene oxide and a component (X) in the presence of a double metal cyanide (DMC) catalyst;
- wherein the polymeric formaldehyde compound has at least one terminal hydroxyl group;
- wherein the component (X) comprises at least one terminal hydroxyl group, at least one terminal carboxyl group and/or at least one terminal thiol group;
- wherein the theoretical molar mass of the polymeric formaldehyde compound is greater than the theoretical molar mass of the component (X);
- wherein the component (X) is distinct from compounds of formula (I),
- and wherein n in formula (I) is a natural number from 0 to 100.
3 more elements
Dependencies are inferred from the claim text.