Naphthalene derivatives and colorants for keratin fibers containing these compounds
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United States of America Patent
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Nov 18, 2008
Grant Date -
Jul 12, 2007
app pub date -
Oct 20, 2004
filing date -
Feb 7, 2004
priority date (Note) -
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Abstract
The agent for coloring keratin fibers, especially human hair, contains at least one common cosmetic additive; an oxidant, such as hydrogen peroxide; and at least one naphthalene derivative of formula (I): ##STR00001## wherein A.sub.1 and A.sub.2 are different from each other and, independently of each other, each denote a partial structure of formula (II), (IIIa), (IIIb), (IV), (V), or (VI): ##STR00002## E is O or S; Y is N or a quaternary nitrogen atom substituted with a C.sub.1-C.sub.6-alkyl group, a C.sub.2-C.sub.4-hydroxyalkyl group, or a C.sub.4-C.sub.6-polyhydroxyalkyl group. New naphthalene derivatives are also described.
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