IMPROVEMENT IN QUALITY OF POLYOXYPROPYLENE DIGLYCERYL ETHER

摘要

PROBLEM TO BE SOLVED: To obtain an odorless polyoxypropylene diglyceryl ether, emitting no malodor with time and suitable for cosmetic materials, etc., by carrying out the addition polymerization of diglycerol with propylene oxide and then adding tocopherol thereto before and/or after deodorization. SOLUTION: The addition polymerization of 1mol diglycerol with preferably 4-30mol propylene oxide is initially carried out and tocopherols (e.g.α-tocopherol) in an amount of preferably 0.01-0.1wt.% based on the polyoxypropylene diglyceryl ether are then added thereto before and/or after carrying out the deodorization. The deodorization is preferably conducted by a method for adding water thereto and distilling off the water under atmospheric pressure or a reduced pressure, etc. The distilling off temperature for the water is preferably 50-120 deg.C and the water is preferably used in an amount of 2-100 pts.wt. based on 100 pts.wt. polyoxypropylene diglyceryl ether.