National Starch and Chemical Investment Holding Corporation

Seiji Asaoka

Tomohiro Hashimoto

Katsuya Koyama

Toshitaka Tsuzuki

Takahiro Sakurai

Takeshi Baba

Tetsuo Sakurai

To provide a cosmetic resin composition for preparation of a hair fixative having all properties of stiffness, shampoo removability, feel, gloss, combability and anti-flaking property. A cosmetic resin composition consisting essentially of an amphoteric urethane resin having a carboxyl group and a tertiary amino group in one molecule thereof, the amphoteric urethane resin having polysiloxane linkage in its structure.

Cosmetic resin composition

The present invention provides a cosmetic which is superior in both characteristics of feel and spread at the time of application. The cosmetic is a cosmetic comprising an amphoteric urethane resin having carboxyl group(s) and tertiary amino group(s) in a molecule, and a silicone polymer.

Cosmetic compositions containing amphoteric polyurethanes

A cosmetic resin composition consisting essentially of an amphoteric urethane resin having a carboxyl group and a tertiary amino group in one molecule there of, the amphoteric urethane resin having a structural unit derived from an ethylene oxide in its structure.

Cosmetic resin composition and cosmetic using the same

The invention presents a method for manufacturing an amphoteric urethane resin, improving at least one of the performance of cosmetics including this amphoteric urethane resin and the storage stability of the urethane resin. The method for manufacturing an amphoteric urethane resin uses (A) a polyol; (B) a polyisocyanate; (C) a polysiloxane compound (except any having at least one selected from a hydroxyl group, a primary amino group and a secondary amino group at one or both ends of the siloxane chain); (D) a compound having carboxyl groups and at least one selected from a hydroxyl group, a primary amino group and a secondary amino group; (E) a compound having tertiary amino groups and at least one selected from a hydroxyl group, a primary amino group and a secondary amino group; and the method includes a step of making a prepolymer including isocyanate groups by reacting the compounds (A), (B) and (D) with excessive isocyanate groups; and a step of reacting the prepolymer including the isocyanate groups with the compound (E); wherein the compound (C) is present in at least one of the first step and the second step.

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Suita, Japan

Seiji Asaoka