AQUEOUS GEL, EXTERNAL PREPARATION FOR SKIN, AND COSMETIC PREPARATION

摘要

Disclosed is an aqueous gel which can be stably maintained even in the presence of an electrolyte. When this aqueous gel is used as a component of a cosmetic preparation or the like, it enables to obtain good feeling of use. Also disclosed are an external preparation for skin and a cosmetic preparation, each of which has excellent stability and enables to obtain good feeling of use. Specifically disclosed is an aqueous gel containing a complex of an amphoteric ionic amphiphilic polymer compound and an anionic polymer compound. The amphoteric ionic amphiphilic polymer compound is presented by the general formula (1) below, and has a weight average molecular weight as determined by gel permeation chromatography of 4,000-2,000,000 and an acyl group content of 0.1-50.0%. Also specifically disclosed are an external preparation for skin containing such an aqueous gel and a cosmetic preparation containing such an aqueous gel. (In the formula (1), n represents an integer of not less than 10; and n-number of R<SUP>1</SUP>'s independently represent a hydrogen atom or an acyl group having 8-18 carbon atoms; and n-number of R<SUP>2</SUP>'s independently represent a carboxymethyl group or a hydrogen atom.)