Shiseido Company, Limited

Shin-ichi Yusa

Atsushi Sogabe

Isamu Kaneda

Ayano Matsuo

Tomo Osawa

Shuji Nishihama

Aqueous compositions can be thickened without increasing stringiness, by using polymers of polyacrylic acid, poly(2-acryamide-2-methylpropanesulfonate), or salts thereof, having a weight average molecular weights of 500,000 to 8,000,000 as thickeners. The polymers contain no more than 10 mass % of polymers having a molecular weight of 10,000,00 or more, and/or contain no more than 10 mass % of polymers having more than three times the weight average molecular weight. Aqueous solutions of these polymers exhibit a low degree of stringiness, and are particularly useful as thickeners for cosmetics.

Low-stringiness thickener and cosmetic material admixed with said thickener

To provide surface-treating agents that can provide excellent hydrophobicity to powder and can improve its rinsability, to provide surface-treated powders that are treated with the surface-treating agent, and to provide cosmetics that comprise the surface-treated powder. A surface-treating agent consisting of a polymer which comprises a monomer (A) represented by the general formula (1) described below as a constituent monomer. (wherein Rrepresents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, Rrepresents an alkylene group having 4 to 22 carbon atoms, Xrepresents an &#x2014;NH&#x2014; group or an oxygen atom, and Mrepresents a hydrogen atom or a monovalent inorganic or organic cation.)

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Himeji, Japan

Shin-ichi Yusa