Shiseido Company, Limited

Masahiro Ohkoshi

Yasunari Nakama

Shuya Tamaki

Fuminori Harusawa

Tsunehiko Iwai

Kyoko Otsubo

A detergent composition having an excellent conditioning effect and low skin irritation, which contains, in an aqueous medium, (i) at least one quaternary ammonium cationic surfactant selected from the group consisting of (a) monoalkyl quaternary ammonium salt cationic surfactant having the formula (I): ##STR1## wherein R.sub.1 represents an alkyl or alkenyl having 12 to 22 carbon atoms, R.sub.2, R.sub.3, and R.sub.4 independently represent methyl or ethyl, and X.sub.1 represents a halogen atom or a methylsulfate residue, (b) ethylene oxide addition quaternary ammonium salt cationic surfactants having the formula (II): ##STR2## wherein R.sub.5 represents an alkyl having 16 to 22 carbon atoms, R.sub.6 represents methyl, ethyl, or an alkyl having 16 to 22 carobn atoms, X.sub.2 represents a halogen atom or a methylsulfate or ethylsulfate residue, m and n are independently 0 or an integer of at least 1, provided that the sum of m and n is 1 to 30, and (c) imidazoline quaternary ammonium salt cationic surfactants having the formula (III): ##STR3## wherein R.sub.7 and R.sub.8 independently represent an alkyl or alkenyl having 12 to 22 carbon atoms, and X.sub.3 represents an halogen atom or a methylsulfate or ethylsulfate residue;

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Yokohama, Japan

Masahiro Ohkoshi