METHOD FOR PRODUCING POLYETHER POLYOL

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PROBLEM TO BE SOLVED : To provide a simple method for producing a polyether polyol, which facilitates molecular weight control and requires no complicated pretreatment or posttreatment.SOLUTION : A method for producing a polyether polyol includes : polymerizing an active hydrogen compound and a cyclic ether in the presence of a Lewis acid catalyst including a rare-earth metal as an active center without using acetic anhydride as a polymerization accelerator. As the Lewis acid catalyst, scandium (III) triflate [Sc(OTf)] and scandium (III) trifuryl imide [Sc(NTf)] are particularly preferred.