Novel couplers for use in oxidative hair dyeing
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United States of America Patent
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Issued Date -
Oct 10, 2002
app pub date -
Jan 18, 2002
filing date -
Jan 23, 2001
priority date (Note) -
Abandoned
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Abstract
Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1 where R.sub.1 and R.sub.2 are each individually selected from a hydrogen atom, a C.sub.1 to C.sub.3 alkyl group, a C.sub.1 to C.sub.5 mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
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