Abstract: Liquid cleansing agents with a low viscosity, containing (A) one or more kinds selected from the group consisting of N-acyl acidic amino acid and a salt thereof, (B) one or more kinds selected from the group consisting of N-acyl neutral amino acid and a salt thereof, and (C) an amphoteric surfactant can be filled in a foamer container and are cleansing agents with high cleansing power which afford fine foam discharged from a foamer container, maintain fineness, provide a good amount of lather and a smooth feeling after washing, can prevent clogging in a foamer container during use at low temperatures, and are also superior in low temperature stability.

Abstract: The present invention provides a surfactant that has good foaming, foam quality, and solubility even having a pH equivalent to that of the skin, which is weakly acidic, has a low viscosity with high handleability, and can be useful in a product such as a personal care product, for example, a cosmetic. More specifically, the present invention provides a surfactant including an N-monounsaturated acyl acidic amino acid or a salt thereof, wherein the N-monounsaturated acyl is an acyl having 10 to 16 carbon atoms.

Abstract: Liquid cleansing agents with a low viscosity, containing (A) one or more kinds selected from the group consisting of N-acyl acidic amino acid and a salt thereof, (B) one or more kinds selected from the group consisting of N-acyl neutral amino acid and a salt thereof, and (C) an amphoteric surfactant can be filled in a foamer container and are cleansing agents with high cleansing power which afford fine foam discharged from a foamer container, maintain fineness, provide a good amount of lather and a smooth feeling after washing, can prevent clogging in a foamer container during use at low temperatures, and are also superior in low temperature stability.