Stable, aqueous cationic hydrogel
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United States of America Patent
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Dec 23, 2003
Grant Date -
Aug 23, 2001
app pub date -
Jan 12, 2001
filing date -
Jul 7, 1999
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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.times. at a pH of 3-9 and absorb up to 200.times. its weight of water. The hydrogel also can effectively condition hair even in the presence of an anionic surfactant.
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