Two-stage process for dyeing keratin fibres
First Claim
1. Process for dyeing keratin fibres, which comprises treating the fibres with a first composition having a pH from 7 to 13, and subsequently, without any intermediate rinsing, treating the said fibres with a second composition having a pH which is less than 8 which contains a direct dyestuff which is a nitrobenzene dyestuff, anthraquinone dyestuff, triphenylmethane dyestuff, azo dyestuff, metallised dyestuff, xanthene dyestuff, acridine dyestuff or a polymeric dyestuff of the formula ##STR9## wherein R represents H or an anthraquinone dyestuff and n represents an integer from 2 to 20 and mixtures thereof.
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Abstract
A two-stage process for dyeing keratin fibres, especially human hair, is described which involves treating the fibres with a first composition at a first pH and subsequently, without rinsing treating the fibres with a second composition at a second pH, at least one of the compositions containing a dyestuff for the fibres, and the second pH being different from the first pH so as to modify the effect of at least one active ingredient on the fibres.
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Citations
31 Claims
- 1. Process for dyeing keratin fibres, which comprises treating the fibres with a first composition having a pH from 7 to 13, and subsequently, without any intermediate rinsing, treating the said fibres with a second composition having a pH which is less than 8 which contains a direct dyestuff which is a nitrobenzene dyestuff, anthraquinone dyestuff, triphenylmethane dyestuff, azo dyestuff, metallised dyestuff, xanthene dyestuff, acridine dyestuff or a polymeric dyestuff of the formula ##STR9## wherein R represents H or an anthraquinone dyestuff and n represents an integer from 2 to 20 and mixtures thereof.
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7. Process for dyeing keratin fibres which comprises:
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(a) treating the fibres with a first composition which has a pH from 7 to 13 and contains an oxidative dyestuff precursor of the para type selected from the group consisting of; a para-aminophenol; N,N'"'"'-diarylalkylenediamine in which the aryl groups are substituted in the para position by OH or an amino group wherein the amino group is unsubstituted or substituted by an alkyl group, wherein the aryl groups are independently unsubstituted, alkyl-substituted or halogen-substituted, and in which the alkylene group contains a chain hetero-atom of oxygen or nitrogen, and is unsubstituted or hydroxy-substituted or alkyl-substituted, the nitrogen atoms of the alkylenediamine group being unsubstituted, alkyl-substituted, hydroxyalkyl-substituted or aminoalkyl-substituted; and a compound of the formula;
##STR12## in which;
R1 and R2 independently of one another denote hydrogen, phenyl, furfuryl, tetrahydrofurfuryl or a linear or branched alkyl group which is unsubstituted or chain-terminated by a hydroxyl, alkoxy, a primary, secondary or tertiary amino group, acylamino, alkyl or aryl-sulphonyl-amino, carbalkoxyamino, ureido, carboxyl or carbamyl in which the nitrogen atom is unsubstituted or mono- or di-substituted, said alkyl groups including alkyl groups containing oxygen or nitrogen atoms and alkyl groups substituted by hydroxy or amino groups;
or R1 and R2 together form, together with the nitrogen atom to which they are attached, a heterocyclic ring; and
R3, R4, R5 and R6 independently of one another denote hydrogen, halogen, linear or branched alkyl which is unsubstituted or substituted by one or more OH, amino or alkoxy groups, or a group OZ, Z denoting alkyl, hydroxyalkyl, alkoxyalkyl, acylaminoalkyl, carbalkoxyaminoalkyl, mesylaminoalkyl, ureidoalkyl, aminoalkyl or mono- or di-alkylaminoalkyl, the alkyl radicals containing 1 to 6 carbon atoms, with the proviso that if R2 denotes phenyl, R1, R3, R4, R5 and R6 denote hydrogen, and that if R1 and R2 are both different from hydrogen, R3 and R6 both denote hydrogen or an organic or inorganic acid salt thereof; and
mixture thereof; and(b) subsequently, without any intermediate rinsing, treating the said fibres with a second composition which has an acid pH and contains a coupler of the formula;
##STR13## in which;
X denotes --OH, --NH2 or --N(CH3)2, R21 or R19 denotes H or an alkyl radical having 1 to 4 carbon atoms, R20 denotes COCH3, CONH2 or an alkyl radical having 1 to 4 carbon atoms, R22 denotes hydrogen, --COCH3 or --CONH2, and R23 denotes OH or amino, or an organic or inorganic acid salt thereof, or 6-aminoindoline.
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- 11. Process for dyeing keratin fibres which comprises treating the fibres with a first composition having a pH of less than 8, and containing an oxidative dyestuff amine-substituted aromatic precursor of the para type, in which either the amino group is secondary or tertiary, or the amino group is primary and the aromatic nucleus carries at least 2 substituents and subsequently, without any intermediate rinsing, treating the said fibres with a second composition having a pH so as to give on the keratin fibres a pH of more than 8.
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12. Process for dyeing keratin fibres, which comprises treating the fibres with a first composition having a pH of less than 8 and containing a direct dyestuff;
- said direct dyestuff being a nitrobenzene dyestuff, anthraquinone dyestuff, triphenylmethane dyestuff, azo dyestuff, metallized dyestuff, xanthene dyestuff, acridine dyestuff or a polymeric dyestuff of the formula ##STR14## wherein R represents H or an anthraquinone dyestuff and n represents a integer from 2 to 20, and mixtures thereof;
wherein said direct dyestuff precipitates on the fibres after treating the fibres; and
without intermediate rinsing, treating the fibres treated with the first composition with a second composition having a pH of more than 8. - View Dependent Claims (13)
- said direct dyestuff being a nitrobenzene dyestuff, anthraquinone dyestuff, triphenylmethane dyestuff, azo dyestuff, metallized dyestuff, xanthene dyestuff, acridine dyestuff or a polymeric dyestuff of the formula ##STR14## wherein R represents H or an anthraquinone dyestuff and n represents a integer from 2 to 20, and mixtures thereof;
Specification