Hair dye composition

US6648924B2 · kind B2 · utility

Assignee

• KAO CORPORATION · JP

Inventors

• Hajime Miyabe · Sumida, JP
• Kenichi Matsunaga · Darmstadt, DE
• Yukihiro Ohashi · Mooka, JP
• Shintaro Totoki · Sumida, JP
• Yoshinori Saito · Nanbu, JP

Key dates

• Filing date: Apr 5, 2001
• Grant date: Nov 18, 2003
• Expiry date: Apr 5, 2021

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K8/4926
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Provided is a hair dye composition comprising a direct dye (1):A—CR1═N—NR2—B X−  (1)[wherein, A represents a group (2) or (3): (in which, R3, R4 and R5 each independently represents a (substituted) C1-6 alkyl group, ring C may have a substituent or may by cyclocondensed with an aromatic ring, R6 and R7 each independently represents a (substituted) C1-6 alkyl group, or may be coupled to form a heterocycle together with the adjacent nitrogen atom, Z represents a (substituted) C1-4 divalent linear hydrocarbon group and ring D may be cyclocondensed with an aromatic ring), B represents a (substituted) aromatic group, R1 represents H or a (substituted) C1-6 alkyl group, R2 represents H or a (substituted) C1-6 alkyl group or a (substituted) aromatic group or may form a heterocycle together with the C atom of the aromatic ring B, and X− represents an anion]. This hair dye composition has markedly strong hair dyeing power and less color fade over time, and undergoes a smaller change in color tone of the dye even after storage.