Patent ID: 6815467
Filing Date: 2004-11-09
Classification: C08G,C08J

Abstract:
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 %.