Patent ID: RE42127

Claim:
A method for treating a keratin-containing substrate comprising contacting said substrate with an effective amount of a cosmetically acceptable medium comprising from about 0.1 to about 20% by weight of an ampholyte polymer comprising: (a) acrylamidopropyltrimethyl ammonium chloride or 35 to 52 . 5 mol % methacrylamidopropyltrimethyl ammonium chloride , alone or in combination ; and (b) 35 to 52 . 5 mol % acrylic acid , methacrylic acid, 2-acrylamido-2-methylpropane sulfonic acid or 2-methacrylamido-2-methylpropane sulfonic acid, alone or in combination ; and ( c ) 5 to 20 mol % of methyl acrylate, wherein the mol ratio of a):b) ranges from about 20:80 to about 95:5 and wherein the weight average molecular weight of said polymer, as determined by viscometry, is at least about 100.000 100,000 .