Methods for producing a polyol and a polymer dispersed polyol

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/48 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08G 18/40 (2006.01) C08G 18/63 (2006.01) C08G 18/76 (2006.01) C08G 65/26 (2006.01) C08J 9/22 (2006.01)

Patent

CA 2393891

A method for producing a polyoxyalkylene polyol which comprises subjecting propylene oxide and ethylene oxide to ring-opening addition polymerization with. an initiator in the presence of a catalyst, wherein the polyoxyalkylene polyol is a polyoxyalkylene polyol obtained by subjecting propylene oxide to ring-opening addition polymerization with an initiator in the presence of a double metal cyanide complex catalyst to form an oxypropylene block chain, subjecting ethylene oxide and propylene oxide to ring- opening addition polymerization randomly to form an oxyalkylene random chain, changing the catalyst and subjecting ethylene oxide to ring-opening addition polymerization in the presence of an alkali metal catalyst to form an oxyethylene block chain, and the polyoxyalkylene polyol is a polyoxyalkylene polyol having a hydroxyl value of from 5 to 56 mgKOH/g, a proportion of an initiator residue of at most 25 mass, a proportion of the oxypropylene block chain of from 5 to 50 mass% a total oxyethylene group content of from 5 to 60 mass%, and a ratio of primary hydroxyl groups among terminal hydroxyl groups of at least 60 mol%.

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