PROBLEM TO BE SOLVED: To improve feelings upon use and a skin-irritating property of an external preparation for skin in which a thickener composed of produced microgel is formulated by carrying out radical polymerization of a water-soluble ethylenic unsaturated monomer in a disperse phase in a composition containing a water phase in which a water-soluble ethylenic unsaturated monomer is dissolved in water as a disperse phase and containing an organic solvent or oil as a disperse medium.SOLUTION: The composition is composed of a thickener composed of microgel obtained by dissolving a water-soluble ethylenic unsaturated monomer into a disperse phase and carrying out radical polymerization of the monomer in the disperse phase and a compound represented by general formula (1): R1O-[(AO)m(EO)n]-R2 (wherein AO is a 3-4C oxyalkylene groupEO is an oxyethylene group m and n satisfy each the formulas: 1&lem&le70 and 1&len&le70).COPYRIGHT: (C)2006,JPO&NCIPI【課題】 水溶性エチレン性不飽和モノマーを水に溶解した水相を分散相とし、有機溶媒あるいは油分を分散媒とする組成物において、分散相中で水溶性エチレン性不飽和モノマーをラジカル重合することにより製造したミクロゲルからなる増粘剤を配合した皮膚外用剤の使用感や皮膚刺激性を改善する。【解決手段】水溶性エチレン性不飽和モノマーを分散相に溶解し分散相中にてラジカル重合して得られるミクロゲルからなる増粘剤と、下記一般式(1)で示される化合物からなる組成物。 一般式(1) R1O-[(AO)m(EO)n]-R2 (AOは炭素数3~4のオキシアルキレン基、EOはオキシエチレン基、m及びnはそれぞれ、1≦m≦70、1≦n≦70である。)【選択図】 図1
