Patent ID: 7625574

Claim:
An external composition for skin, comprising: an alkylene oxide derivative expressed by Formula (I): R 1 O—[(AO) m (EO) n ]—R 2 (I) wherein AO is an oxyalkylene group having a carbon number of 3 or 4; EO is an oxyethylene group; m and n are average addition numbers of said AO and EO respectively, which are 1≦m≦70 and 1≦n≦70, wherein said EO is 20-80% by weight with respect to a total of said AO and EO; wherein AO and EO are added to each other in random form; wherein R 1 and R 2 are either identical to or different from each other, and wherein said R 1 and said R 2 are alkyl groups having a carbon number of 1-4; and a water-soluble medicament, wherein said skin of said external composition is human skin or hair, wherein said external composition is applied to said human skin or hair, and wherein said alkylene oxide derivative is a transdermal absorption improving agent for said water-soluble medicament.