Invert soap - invert soap

Japanese: 逆性セッケン(逆性石鹼) - ぎゃくせいせっけん（英語表記）invert soap

Another name for cationic surfactants. Unlike anionic surfactants such as soap, in which the lipophilic group becomes an anion, these become cationic, hence the name, also known as positive soap. Representative examples are tertiary alkylamine salts and quaternary alkylammonium salts. Like other surfactants, negative soaps form an interfacial adsorption layer to reduce surface tension, but they have no cleaning power and instead cause anionic substances such as fatty acids to be adsorbed to fibers, etc. In hard water, they do not precipitate even when coexisting with metal salts.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

陽イオン界面活性剤の別称。セッケンを代表とする陰イオン界面活性剤では親油基が陰イオンになるのに反し，これは逆に陽イオンになるところからの名称で，陽性セッケンともいう。第三アルキルアミン塩，第四アルキルアンモニウム塩が代表的なものである。逆性セッケンは，他の界面活性剤と同様に界面吸着層を形成して表面張力を低下させるが，洗浄力はなく，むしろ脂肪酸等の陰イオン性の物質を繊維等に吸着させる。硬水中，金属塩と共存しても沈殿しない。

出典　株式会社平凡社世界大百科事典第２版について　情報

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