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US 6,206,935 B1Granted
Hair dyeing method
AssigneeKao Corporation
InventorsSatoshi Onitsuka, Kazuhiro Okada, Hajime Miyabe
Life of this patent
Estimating the term…
Abstract
Described in the present invention is a hair dyeing method comprising treating the hair with a hair bleaching agent and then, without rinsing off the bleaching agent, with a direct hair dye. The present invention makes it possible to color the hair into a vivid color in a short time.
Claims10
A hair dyeing method, which comprises treating the hair with a hair bleaching agent and then, without washing away said bleaching agent, treating the hair with a direct hair dye,
- wherein the direct hair dye contains an acid dye (A), and propylene carbonate (B) and/or at least one organic solvent (C) selected from the group consisting of benzyloxyethanol, benzyl alcohol, phenoxyethanol, phenoxyisopropanol, benzyl glycerol, N-benzylformamide, cinnamyl alcohol, phenetyl alcohol, panisyl alcohol, p-methylbenzyl alcohol, methyl carbitol, ethyl carbitol and propyl carbitol, and has a pH of 2 to 6.
Dependencies are inferred from the claim text.