BASE FOR EXTERNAL PREPARATIONS FOR THE SKIN AND COSMETICS CONTAINING THE SAME

摘要

A base material for an external preparation for skin containing an alkylene oxide derivative is new. A base material for an external preparation for skin containing an alkylene oxide derivative is new. The alkylene oxide derivative is represented by formula (I). R1>O-((AO)m(EO)n)-R2> (I) AO : 3-4C oxyalkylene group; EO : oxyethylene group; R1>, R2>H atom or 1-4C hydrocarbon group; and m, n : mole numbers between 1 and 70. The amount of the oxyethylene group is 20 - 80 wt% of the total amount of the oxyalkylene and the oxyethylene groups. The ratio of the amount of H atoms to the amount of the hydrocarbon groups in R1> and R2> is 0.15 or less.