Stable, aqueous cationic hydrogel

US6667029B2 · kind B2 · utility

Assignee

• ISP Investments LLC · US

Inventors

• Yuanzhen Zhong · Wayne, US
• Janusz Jachowicz · Stamford, US
• Philip F. Wolf · Bound Brook, US
• Roger Mc Mullen · Bloomfield, US

Key dates

• Filing date: Jan 12, 2001
• Grant date: Dec 23, 2003
• Expiry date: Jul 24, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F226/10
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A stable, aqueous cationic hydrogel of, by weight, 1-50% of a crosslinked cationic copolymer of 5-95% vinylpyrrolidone (VP) and 5-95% 3-dimethylaminopropyl(meth)acrylamide (DMAPMA) monomers, a crosslinking agent in an amount of 0.05-1% of said monomers, and water is described. The hydrogel has a pH of about 10 and a Brookfield viscosity of about 650 (Model DV-II+, RV spindle #3, speed 10 rpm); it can increase its viscosity by up to 40× at a pH of 3-9 and absorb up to 200× its weight of water. The hydrogel also can effectively condition hair even in the presence of an anionic surfactant.