Alkylene oxide polymer production method

A method for the production of an alkylene oxide polymer comprising polymerizing an alkylene oxide in the presence of a zinc catalyst in an inert hydrocarbon solvent to produce an alkylene oxide polymer, wherein the method comprises:

• (a) preparing a zinc catalyst by reacting an organozinc compound with a monohydric alcohol in an amount of 12 equivalents or less relative to the organozinc compound and an aliphatic polyhydric alcohol in an amount of 0.2 to 1.1 equivalents relative to the organozinc compound,
• (b) distilling the zinc catalyst obtained by step (a) at a temperature not exceeding 100° C. such that the amount of the monohydric alcohol in the polymerization reaction is 0.01 equivalents or less relative to the organozinc compound, and further heat treating the zinc catalyst under a heat treatment temperature from 100° C. to 130° C. after performing the distillation, and
• (c) polymerizing the alklyene oxide in the presence of the zinc catalyst in which the amount of the monohydric alcohol has been adjusted to 0.01 equivalents or less relative to the organozinc compound.