METHOD FOR PRODUCING POLYALKYLENE GLYCOL, VISCOSITY INDEX IMPROVER, LUBRICATING OIL COMPOSITION, AND METHOD FOR PRODUCING LUBRICATING OIL COMPOSITION

摘要

This method for producing polyalkylene glycol comprises polymerizing an alkylene oxide using a composite metal catalyst and producing a polyalkylene glycol, wherein the polymerization reaction is carried out in the presence of 10-90 mass% of organic solvent relative to the polyalkylene glycol to be produced.