Patent ID: 6379399
Filing Date: 2002-04-30
Classification: A61K,A61Q

Abstract:
An oxidative dyeing process for producing coloration of hair along the length of a shaft of the hair, the process comprising:providing an oxidative hair coloring system comprising at least one primary intermediate, at least one coupler comprising 2-amino-8-hydroxyquinoline, and an alkaline hydrogen peroxide or hydrogen peroxide precursor solution; contacting the hair with the oxidative hair coloring system for an effective period of time to color the hair; and rinsing, shampooing and drying the hair; wherein the at least one primary intermediate and the at least one coupler are oxidized to form a coupled dye product in the hair, and the coupled dye product is of greater stability to alkaline hydrogen peroxide solution in less porous virgin hair than in more porous damaged hair.