PROBLEM TO BE SOLVED: To provide a method for simply producing a betaine ester-containing mixture imparting good flexibility, smoothness and oily feeling to the hair.SOLUTION: The method for producing the mixture includes reacting a monohalogenated carboxylic ester with a tertiary amine in a solvent of a secondary alcohol of formula (1) [wherein, R6 is R8-O-(AO)n-CH2- R8 is a 1-40C alkyl group or the like A is a 2-4C alkylene group n is a number of 0-50 and R7 is a 1-40C alkyl group or the like] to provide the mixture of the betaine ester of formula (2) [wherein, R1 is an 8-40C alkyl group or the like R2 is a 1-5C alkylene group R3, R4 and R5 are each a 1-24C alkyl group or the like and X is a halogen atom] with the secondary alcohol of formula (1).COPYRIGHT: (C)2009,JPO&INPIT【課題】毛髪に対し良好な柔軟性、平滑性、油性感を付与するベタインエステル含有混合物の簡易な製造方法の提供。【解決手段】モノハロゲンカルボン酸エステルと第3級アミンを、2級アルコール(1)溶媒中で反応させて、ベタインエステル(2)と2級アルコール(1)の混合物を得る。〔R6はR8-O-(AO)n-CH2-、R8はC1-40のアルキル基等、AはC2-4のアルキレン基、nは0~50の数、R7はC1-40のアルキル基等を示す。〕〔R1はC8-40のアルキル基等、R2はC1-5のアルキレン基、R3,R4及びR5はC1-24のアルキル基等、Xはハロゲン原子を示す。〕【選択図】なし
