PRODUCTION OF POLYETHER POLYOL

PURPOSE:To obtain the subject high-purity polymer with a narrow molecular- weight distribution, by reacting a polyhydroxy compound of solid state at ambient temperatures with an alkylene oxide in the presence of a catalyst and purifying the resultant prepolymer and subsequently reacting the purified material with an alkylene oxide without using a solvent in the presence of a specified catalyst. CONSTITUTION:A polyhydroxy compound (e.g. pentaerythritol) of solid state at ambient temperatures is reacted with an alkylene oxide (e.g. propylene oxide) in the presence of a catalyst to prepare a liquid prepolymer and the liquid prepolymer is purified. An alkali metal alkolate (e.g. potassium t-butoxide) or alkaline metal is subsequently added and dissolved into the purified prepolymer as a catalyst and an alkylene oxide is then added thereto followed by a reaction of the mixture without using a solvent at