COMPOSITION CONTAINING NEUTRALIZED CROSS-LINKED POLY(2-ACRYLAMIDO-2-METHYLPROPANESULFONIC ACID) WITHOUT SURFACTANT FOR USING AT TOPICAL PORTION IN OIL-IN-WATER TYPE EMULSION

摘要

PROBLEM TO BE SOLVED: To obtain a composition for cosmetics and dermatology without using a surfactant harmful to the eye and the scalp, capable of manifesting not only excellent cosmetic characteristics but also excellent emulsion stability of oil-in- water type by including a specific polymer. ;SOLUTION: This composition is an oil-in-water type one and includes no surfactant but a polymer of a cross-linked poly(2-acrylamido-2- methylpropanesulfonic acid) {e.g. a polymer including 90-99.9wt.% unit of formula I [X⁺ is a cation (mixture) with the proviso that X⁺ less than 10mol% thereof is H⁺] and 0.01-10wt.% cross-linking unit formed of a monomer having ≥2 olefinic double bond [e.g. a compound of formula II (R₁ is H or a 1-4C alkyl)] based on the whole amount of the polymer at a random distribution} neutralized in ≥90% thereof, preferably in an amount of 0.01-20wt.% based on the whole amount of the composition.;COPYRIGHT: (C)1998,JPO