Primary intermediates for oxidative coloration of hair
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United States of America Patent
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Jun 15, 2004
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N/A
app pub date -
Jan 18, 2002
filing date -
Jan 23, 2001
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Abstract
Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): ##STR1## wherein R.sub.1 and R.sub.2 are each independently selected from hydrogen atoms, a C.sub.1 to C.sub.5 alkyl or hydroxyalkyl group, or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2, with the proviso that when n is equal to 2 only one of R.sub.1 and R.sub.2 may be hydrogen.
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