Tri-aromatic azomethine direct dyes comprising at least one unit derived from resorcinol, dyeing composition, method and use
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United States of America Patent
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Sep 13, 2016
Grant Date -
Jan 29, 2015
app pub date -
Dec 13, 2012
filing date -
Dec 13, 2011
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Abstract
The present invention relates to azomethine-type direct dyes with a tri-aromatic unit having the following formula (I): and their use for coloring keratin fibers, particularly human keratin fibers such as the hair. The invention also relates to a composition for dyeing keratin fibers comprising, in a suitable medium for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibers using said dyeing composition. Finally the present invention also relates to precursors for these direct dyes.
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