HAIRDYE

Japanese Patent JP3709370

B2

PROBLEM TO BE SOLVED: To provide a safe hairdye capable of dyeing the hair without adsorption of a coloring matter (an acid dye) on the skin (e.g. scalp), hardly causing discoloration of the coloring matter, and free from bad effects such as the damage of the hair, and further to provide a method for dyeing the hair by using the hairdye.
SOLUTION: The hair is dyed by using (A) an acid dye having ≤1,000 molecular weight, and (B) a water-soluble polymer, especially a nonionic water-soluble polymer (e.g. a hydroxyethylcellulose) as a thickener present in (C) water and/or a water-soluble organic solvent within a neutral pH region of 6.5-7.5 without formulating an acid such as citric acid, or within an alkaline pH region of 7.0-11.0 regulated by formulating (D) a proper pH regulator when dyeing the hair by the hairdye. As a result, the dye penetrates into the inside of the hair and the inside of the hair fiber is dyed without causing adsorption of the coloring matter on the surface of the hair and the skin. The objective hairdye is provided by using the phenomena. The method for dyeing the hair by using the hairdye is also provided.

JP2003238384	SKIN CARE PREPARATION
WO/1993/016135	SHAVING AID FOR A WET RAZOR
JPH06234935	METHOD FOR STABILIZING COLORING MATTER

Masao Saito

JP2001365166A

October 26, 2005

November 29, 2001

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System Association Co., Ltd.

A61K8/00; A61K8/73; A61Q5/10; (IPC1-7): A61K7/13

JP63239209A
JP6345628A
JP8225435A
JP9030940A
JP11060453A
JP11335250A
JP2002003350A
JP2002154939A
JP2002255757A
JP2003104850A
JP8157345A
JP8175940A
JP8245348A
JP10245327A
JP9030940A

Kato Asamichi

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