PROBLEM TO BE SOLVED: To solve the following conventional problems that: although a bath additive has sufficient initial smell when the bath additive is dissolved in hot water, that the smell is reduced during bathing although there is an improving method for enhancing durability of smell by adding water soluble macromolecule into membrane material of the perfume and mixing an amphiphilic solvent with nonionic surfactant and/or cationic surfactant so as to be mixed into an oil-in-water emulsifier prepared in advance, it cannot be said that the durability of smell is not sufficient in hot water, thus there is a need for further improvement.SOLUTION: There is provided a producing method of an oil-in-water perfume emulsifier in which (B) perfume is mixed with (A) higher alcohol having 12 to 24 atoms, (C) nonionic surfactant (and/or cationic surfactant), and (D) amphiphilic solvent, then water of several portions is added and mixed at a specific ratio of 0.1 to 1.2 in mass ratio of water/((A)+(B)+(C)+(D)). The bath additive composition has a feature of containing a perfume emulsified composition for bath additive produced by the producing method of the perfume emulsifier for bath additive.COPYRIGHT: (C)2015,JPO&INPIT【課題】従来、入浴剤をお湯に溶かした初期の香りは十分であるのに対し、入浴中の香りが弱くなる課題があった。香りの持続性を上げる方法として、香料の膜材に水溶性高分子を配合したり、両親媒性溶媒と非イオン界面活性剤及び/又はカチオン界面活性剤とを混合し、別に調製した水中油型乳化物に混合させる等の工夫がなされているが、お湯の中では香りの持続性は充分とはいえず、さらなる改善が求められる。【解決手段】(B)香料を(A)炭素数12~24の高級アルコールと(C)非イオン性界面活性剤(及び/又はカチオン界面活性剤)、(D)両親媒性溶媒と混合した後、水/((A)+(B)+(C)+(D))の質量比が0.1~1.2特定の割合で水を分割して添加、混合することを特徴とする水中油型香料乳化物の製造方法であり、入浴剤用香料乳化物の製造方法によって製造された入浴剤用香料乳化組成物を含有することを特徴とする入浴剤組成物である。【選択図】 なし
