Back to results
US 10,588,846 B2Granted
Copolymers for improving color intensity and washfastness of temporary hair dyes
AssigneeSekisui Specialty Chemicals America, LLC
InventorDavid B. Wurm
Life of this patent
Estimating the term…
Abstract
A method for dyeing hair includes applying a polyvinyl amine copolymer solution to the hair; and applying a hair dye composition to the hair. A hair dye composition includes an aqueous base fluid; a polyvinyl amine copolymer; and an anionic or cationic hair dye. A method of making a hair dye composition includes mixing a polyvinyl amine copolymer and an anionic or cationic hair dye into an aqueous base fluid.
Claims14
A method for dyeing hair, comprising:
- applying a polyvinyl amine copolymer solution to the hair, wherein the polyvinyl amine copolymer comprises from about 0.5 mol % to 20 mol % amine functional groups;
- and
- applying a hair dye composition to the hair, wherein the polyvinyl amine copolymer solution is applied to the hair prior to the hair dye composition.
A method for dyeing hair, comprising:
- applying a polyvinyl amine copolymer solution to the hair, wherein the weight average molecular weight of the polyvinyl amine copolymer is greater than or equal to about 5,000 g/mol, and less than or equal to about 2,000,000 g/mol;
- and
- applying an anionic or cationic hair dye composition to the hair, wherein the polyvinyl amine copolymer solution is applied to the hair prior to the hair dye composition.
A method for dyeing hair, comprising:
- applying a polyvinyl amine copolymer solution to the hair, wherein the polyvinyl amine copolymer solution has a pH value of from about 6 to 12;
- and
- applying a hair dye composition to the hair, wherein the polyvinyl amine copolymer solution is applied to the hair prior to the hair dye composition.
Dependencies are inferred from the claim text.