Coloring hair with aminoalkyl-or aminohydroxyalkyl-catechols
AssigneeClairol Incorporated
InventorsThomas M. Schultz, Leszek J. Wolfram, Keith C. Brown, Giuseppe Prota
Life of this patent
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Abstract
A process for coloring hair in which a functional metal ion and aminoalkyl or aminohydroxyalkyl catechols are used in combination or applied sequentially to dye the hair rapidly.
Claims16
A process for coloring hair which comprises treating said hair with a metal salt capable of assisting the conversion of a catechol compound to a melanin-like material and an aminoalkyl- or aminohydroxyalkyl-catechol having the formula:
- ##STR3## wherein:
- (a) R.sub.1 and R.sub.2 are radicals selected from the group consisting of H, OH, alkyl, alkoxy, alkoxyalkyl, NO.sub.2, --COOH and carboalkoxy;
- (b) R.sub.3 is selected from the group consisting of R.sub.1 and NH.sub.2 ;
- (c) R.sub.4 is selected from the group consisting of H, --CH.sub.2 NHR.sub.5, --CHOHNHR.sub.5, --CH(alkyl)NHR.sub.5, --CH(NHR.sub.2) NHR.sub.5, CH(NO.sub.2)NHR.sub.5, --CH(alkoxy)NHR.sub.5, CH(NHR.sub.2)NHR.sub.5, --CH(alkoxy)NHR.sub.5 --CH(carboxy)NHR.sub.5, --CH(carboalkoxy)NHR.sub.5), --CH(aryl)NHR.sub.5 --CH(aryloxy)NHR.sub.5, or --CH(halogen)NHR.sub.5 ;
- wherein R.sub.5 is selected from H, alkyl or aryl, and wherein
- (d) at least one of R.sub.1, R.sub.2, R.sub.3 or R.sub.4 is an amino group bonded to a ring carbon atom of said formula through an alkylene bridging group.
A process for dyeing human hair comprising the step of contacting said hair with at least one metal salt capable of assisting the conversion of a catechol compound to a melanine-like material and with at least one compound of the formula ##STR5## wherein R.sup.1 is H or OH;
- R.sup.2 is H or alkyl;
- and n is 0 or 1.
Dependencies are inferred from the claim text.