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US 10,478,643 B2Granted
Hair dyeing composition
AssigneeKao Germany GmbH
InventorsDominic Pratt, Bernd Nöcker, Fariba Ghiasi
Life of this patent
Estimating the term…
Abstract
The present invention relates to a hair dyeing composition comprising select hair direct dyes and a reducing agent in order to color hair homogeneously, intensively and durably.
Claims13
A ready to use aqueous composition for coloring hair comprising one or more direct dyes selected from the compounds
- and one or more reducing agents selected from the group consisting of thioglycolic acid and its salts, thiolactic acid and its salts, dihydrolipoate, thioglycerol, mercapropropionic acid and its salts, cysteine and its salts, N substituted cysteins, cystamines, thioethanol, sulfite salts, bisulfite salts, and metabisulfite salts.
A two-part aqueous hair coloring composition comprising parts A and B for mixing prior to application onto hair, wherein the part A is an aqueous composition comprising one or more direct dyes selected from the compounds
- and the part B is an aqueous composition comprising one or more reducing agents selected from the group consisting of thioglycolic acid and its salts, thiolactic acid and its salts, dihydrolipoate, thioglycerol, mercapropropionic acid and its salts, cysteine and its salts, N substituted cysteins, cystamines, thioethanol, sulfite salts, bisulfite salts, and metabisulfite salts.
Dependencies are inferred from the claim text.