PROBLEM TO BE SOLVED: To provide a whitening external preparation, such as a whitening cosmetic, allowing skin penetration property of a whitening component and rapid passage of a lot of whitening components through a horny layer, and exhibiting high whitening effect.SOLUTION: A whitening external preparation uses at least one alkylene oxide derivative represented by the formula (I) in combination with a water-soluble whitening component. (In the formula, Z is a residue where a hydroxy group is removed from a compound having 3 to 9 hydroxy groups AO is a C3 to 4 oxyalkylene group EO is an oxyethylene group BO is a C4 oxyalkylene group a is 3 to 9 l, m and n are an average addition molar number of AO, EO and BO respectively, where 1≤l≤50, 1≤m≤50 and 0.5≤n≤5 the weight ratio (AO/EO) of AO to EO is 1/5 to 5/1 and AO and EO may be added in a random or block state.)COPYRIGHT: (C)2015,JPO&INPIT【課題】美白成分の皮膚浸透性が高く、多くの美白成分が角質層を迅速に通過でき、高い美白効果を発揮することのできる美白化粧料等の美白用外用剤の提供。【解決手段】式(I)で表される、少なくとも1つのアルキレンオキシド誘導体を水溶性美白成分と組み合わせて使用する美白用外用剤。(Zは3~9個の水酸基を有する化合物の水酸基を除いた残基;AOはC3~4のオキシアルキレン基;EOはオキシエチレン基;BOはC4のオキシアルキレン基;aは3~9;l、m及びnは各々、AO、EO及びBOの平均付加モル数、1≦l≦50、1≦m≦50及び0.5≦n≦5;AOとEOとの重量比(AO/EO)は1/5~5/1;AO及びEOはランダム状又はブロック状に付加していてもよい)【選択図】なし
