PROBLEM TO BE SOLVED: To provide a polymer emulsifier and an oil in water type emulsion composition containing such the polymer emulsifier.SOLUTION: This polymer emulsifier comprises (a) a constituting unit expressed by general formula (1) [wherein, R1 to R3 are each H or a 1-2C alkyl R4 is a 1-4C alkylene R5 is a 1-30C alkyl X1 is O or NH (n1) is a number of 0 to 30 and (h) is 0 or 1], (b) a hydrophilic constituting unit having a neutralizable functional group and (c) a nonionic hydrophilic constituting unit. The oil in water type emulsion composition comprises (A) the polymer emulsifier, (B) an oily component and (C) water.COPYRIGHT: (C)2008,JPO&INPIT【課題】高分子乳化剤、及びかかる高分子乳化剤を含有する水中油型乳化組成物の提供。【解決手段】 一般式(1)で表される構成単位(a)、中和可能な官能基を有する親水性構成単位(b)、及び非イオン性親水性構成単位(c)を含む高分子乳化剤、この高分子乳化剤(A)、油性成分(B)及び水(C)を含有する水中油型乳化組成物。(式中、R1、R2及びR3はH又はC1-2のアルキル基、R4はC1-4のアルキレン基、R5はC1-30のアルキル基、X1はO又はNH、n1は0~30の数、hは0又は1を示す。)【選択図】 なし
