Patent · US Active

Method for producing polyether ester carbonate polyols

US9657135B2 · kind B2 · utility

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16Claims

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Assignee

Covestro Deutschland AG · DE

Inventors

Thomas Ernst Müller · Aachen, DE
Christoph Gürtler · Cologne, DE
Muhammad Afzal Subhani · Aachen, DE
Walter Leitner · Aachen, DE

Key dates

Filing date	Feb 23, 2015
Grant date	May 23, 2017
Priority date	—
Expiry date	Feb 23, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/4825
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for producing polyether ester carbonate polyols by attaching at least one alkylene oxide, at least one cyclical anhydride, and carbon dioxide to one or more H-functional starter substances in the presence of a double metal cyanide catalyst. The method is characterized in that (α) a suspension agent, which does not contain H-functional groups, is provided in a reactor, and (γ) one or more H-functional starter substances are continuously metered into the reactor during the reaction process, and the one or more alkylene oxides, the cyclical anhydride, and optionally the carbon dioxide are metered simultaneously or sequentially.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.