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AssigneeWella Aktiengesellschaft
InventorsThomas Clausen, Ute Kern, Hans Neunhoeffer
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Composition for the oxidative dyeing of hair based on a combination of developer substances and coupler substances contains, as developer substance, a diaminopyrazol of the general formula (I), ##STR1## wherein R.sup.1, R.sup.2 and R.sup.4 are identical or different and designate hydrogen, alkyl with 1 to 4 carbon atoms, hydroxyalkyl with 2 to 4 carbon atoms, benzyl or phenyl, and R.sup.3 is hydrogen, alkyl with 1 to 4 carbon atoms, hydroxyalkyl with 2 to 4 carbon atoms, with the proviso that the amino groups are in 3,4 or 4,5 position, or its physiologically tolerated, water-soluble salt, new diaminopyrazol derivatives of the above general formula I are also described herein in which R.sup.1 is methyl or benzyl and the R.sup.2 and R.sup.4 are either benzyl, phenyl, hydrogen, alkyl with 1 to 4 carbon atoms or hydroxyalkyl with 2 to 4 carbon atoms and R.sup.3 is either hydrogen, alkyl with 1 to 4 carbon atoms or hydroxylakyl with 2 to 4 carbon atoms. The compounds of formula I are developer substances which are very favorably tolerated physiologically and enable brilliant hair coloring of great depth of color in the red range.
Composition for oxidative dyeing of hair based on a combination of developer substances and coupler substances, containing as a developer substance, a member selected from the group consisting of diaminopyrazoles of the general formula (I), ##STR5## wherein R.sup.1, R.sup.2 and R.sup.4 are each independently selected from the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms, hydroxyalkyl with 2 to 4 carbon atoms, benzyl and phenyl, and R.sup.3 is selected from the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms and hydroxyalkyl with 2 to 4 carbon atoms, with the proviso that the R.sup.2 R.sup.3 N and NHR.sup.4 groups are in a 3 and 4 or 4 and 5 positions of said diaminopyrazol, and water-soluble salts thereof.
Diaminopyrazol derivative of the general formula (II) ##STR6## wherein R.sup.5 is a benzyl group, R.sup.6 and R.sup.8 are each independently selected form the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms, hydroxyalkyl with 2 to 4 carbon atoms, benzyl and phenyl, and R.sup.7 is selected from the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms and hydroxyalkyl with 2 to 4 carbon atoms, with the proviso that the R.sup.6 R.sup.7 N and NHR.sup.8 groups are in the 3 and 4 or 4 and 5 positions of said diaminopyrazol.
Diaminopyrazol derivative of the general formula (III) ##STR7## wherein R.sup.9 is a methyl group, R.sup.10 and R.sup.12 are each independently selected from the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms, hydroxyalkyl with 2 to 4 carbon atoms, benzyl and phenyl, and R.sup.11 is selected from the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms and hydroxyalkyl with 2 to 4 carbon atoms, with the proviso that the R.sup.6 R.sup.7 N and NHR.sup.8 groups are in the 3 and 4 or 4 and 5 positions of said diaminopyrazol, and at least one of the groups R.sup.10 to R.sup.12 is different than hydrogen.
Dependencies are inferred from the claim text.