Patent Number: 7,029,501

Title: Hair dye composition

Abstract: Provided is a hair dye composition containing a dissociative direct dye represented by the following formula (1): ##STR00001## ##STR00002## wherein, R.sup.1 to R.sup.4 each represents H or substituent, X represents OH or --NHSO.sub.2R.sup.5 (R.sup.5 representing an alkyl, aryl or heterocyclic group) and A represents a group of any one of formulas (Cp-1) through (Cp-12). The hair dye composition of the present invention is capable of strongly dyeing the hair with a vivid color tone without causing decomposition of the dye during the dyeing process, exhibits excellent resistance against sunlight, hair washing, perspiration, friction and heat, has a high stability against an alkali agent and an oxidizing agent, has a high dyeing property, and shows less color fade over time.

Inventors: Pratt; Dominic (Darmstadt, DE), Kawagishi; Toshio (Minamiashigara, JP)

Assignee: Kao Corporation

International Classification: A61K 8/00 (20060101)

Expiration Date: 4/18/02018