Hair dye composition

US6616709B2 · kind B2 · utility

Assignee

• KAO CORPORATION · JP

Inventors

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

Key dates

• Filing date: Jun 25, 2001
• Grant date: Sep 9, 2003
• Expiry date: Oct 18, 2021

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61Q5/065
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Provided is a hair dye composition containing a direct dye (1). This hair dye composition has markedly high hair dyeing power, has less color fade over time and undergoes a small change in the color tone of the dye after storage. wherein, ring A may represents a benzene ring which may have a substituent or the like, B represents an aryl or heterocyclic group, D represents N or CR4 (wherein R4 represents H or alkyl), E represents NR5, CR6R7 or CR6═CR7 (wherein R5 represents alkyl or the like, and R6 and R7 each represents H or alkyl) or, O or S, R1 represents alkyl or the like, and n stands for 0 or 1, with the proviso that at n=0, R2 and R5 form, when taken together with N—C—C, a heterocycle, or R2 is bonded to B, thereby forming a heterocycle and at n=1, R2 and R3 form, when taken together with C═D—N, a heterocycle, and X− represents an anion.