Anionic direct dye having a tetraalkylammonium counterion, dyeing composition comprising them and method for dyeing keratinous fibres starting from these dyes
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United States of America Patent
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May 15, 2018
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app pub date -
Nov 16, 2011
filing date -
Nov 18, 2010
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Abstract
The invention relates to the dyeing of human keratinous fibers, in particular the hair, using anionic direct dyes or acid dyes having a tetraalkylammonium counterion of formula (I), with Col(−)m, R1, R2, R3, R4, m, and n as defined in the description. A subject-matter of the invention is a dyeing composition comprising an anionic dye of formula (I) and a method for dyeing keratinous fibers, such as the hair, employing the said composition. A subject-matter of the invention is likewise novel dyes of formula (I) and their uses for the coloring of keratinous fibers. This composition makes it possible to obtain a chromatic, powerful and particularly persistent coloring on keratinous fibers.
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