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US 6,713,599 B1Granted
Formation of polymer polyols with a narrow polydispersity using double metal cyanide (DMC) catalysts
AssigneeBASF SE
InventorsWerner Hinz, Jacob Wildeson, Edward Michael Dexheimer, Raymond Neff
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Abstract
A method of forming a polyol includes the steps of reacting an initiator with an alkylene oxide, and optionally carbon dioxide, in the presence of a double metal cyanide catalyst and a sterically hindered chain transfer agent capable of protonating the growing polyol polymer. The presence of the chain transfer agent reduces the polydispersity of the resultant polyol.
Claims25
A method of forming a polyol comprising the step of:
- reacting an initiator with an alkylene oxide in the presence of a double metal cyanide catalyst and a sterically hindered chain transfer agent, wherein said chain transfer agent is capable of protonating the growing polyol polymer.
A method of forming a polyol comprising the steps of:
- reacting an initiator with an alkylene oxide and carbon dioxide in the presence of a double metal cyanide catalyst and a chain transfer agent, wherein said chain transfer agent is capable of protonating the growing polyol polymer.
Dependencies are inferred from the claim text.