Hair dye composition

US6592630B2 · kind B2 · utility

Assignee

• KAO CORPORATION · JP

Inventors

• Kenichi Matsunaga · Darmstadt, DE
• Hajime Miyabe · Sumida, JP
• Yukihiro Ohashi · Mooka, JP

Key dates

• Filing date: Mar 16, 2001
• Grant date: Jul 15, 2003
• Expiry date: Mar 16, 2021

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K2800/4322
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Provided is a hair dye composition containing a direct dye (1) or (2). The hair dye composition has markedly high hair dyeing power, has less color fade over time and undergoes a smaller change in the color tone of the dye after storage. [R1, R2 and R3 are the same or different and each independently represents a C1-3 alkyl group and benzene ring A or B may contain a nondissociative substituent].