Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Patent
1998-03-06
2000-01-04
Liott, Caroline D.
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
8406, 8407, 8408, 8410, 8421, 8424, 8552, A61K 713
Patent
active
060105410
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a composition for the oxidation dyeing of keratin fibers, and in particular of human keratin fibers such as the hair, comprising at least one oxidation dye precursor and optionally one or more couplers and at least one non ionic amphiphilic polymer containing at least one fatty chain and at least one hydrophilic unit.
It is known to dye keratin fibers, and in particular human hair, with dye compositions containing oxidation dye precursors, which are generally known as "oxidation bases", in particular ortho- or para-phenylenediamines, ortho- or para-aminophenols and heterocyclic bases.
Oxidation dye precursors are compounds which are initially colourless or only slightly coloured and which develop their dyeing power on the hair in the presence of oxidizing agents, leading to the formation of coloured compounds. The formation of these coloured compounds results either from an oxidative condensation of the "oxidation bases" with themselves or from an oxidative condensation of the "oxidation bases" with colour-modifier compounds, or "couplers", which are generally present in the dye compositions used in oxidation dyeing and are represented more particularly by meta-phenylenediamines, meta-aminophenols and meta-diphenols and certain heterocyclic compounds.
The variety of molecules used, which consists, on the one hand, of "oxidation bases" and, on the other hand, of "couplers", makes it possible to obtain a wide variety of colours.
In order to localize the oxidation dye product on the hair when it is applied, in order for it not to run onto the face or outside the areas which it is proposed to dye, use has been made hitherto of traditional thickeners such as crosslinked polyacrylic acid, hydroxyethylcelluloses or waxes or alternatively mixtures of nonionic surfactants with an HLB (hydrophilic-lipophilic balance) which, when suitably selected, gives rise to the gelling effect when they are diluted with water and/or surfactants.
However, the Applicant has observed that the ingredients of the traditional thickener, surfactant and solvent type generally curb the rise of the dye on the fibers, which is reflected in a dull shade and also in a larger use of dye, of solvent and/or of surfactants in order to dissolve the dye, if it is nevertheless desired to obtain and intense shade.
Moreover, the Applicant has also observed that after mixing with the oxidant, dye compositions containing the oxidation dye precursor or precursors and optionally the coupler or couplers, and also the said ingredients, lose some of their gelled nature and consequently give rise to undesirable running.
After considerable research conducted in this matter, the Applicant has now discovered that it is possible to obtain oxidation dye compositions (after mixing with the oxidants) which do not run and thus remain better localized at the point of application, and which also make it possible to obtain more intense or more chromatic (more luminous) shades, if an effective amount of a nonionic amphiphilic polymer containing at least one fatty chain and at least one hydrophilic unit is introduced (i) either into the composition containing the oxidation dye precursor or precursors and optionally the coupler or couplers (or composition (A)), or (ii) into the oxidizing compositions (or composition (B)), or (iii) into both compositions at once.
For the purposes of the present invention, the chromaticity (luminosity) is defined by the value c* in the L*, a*, b* colorimetric notation system of the Commission Internationale de l'Eclairage (C.I.E.) This value is equal to the square route of the sum a.sup.2 +b.sup.2 (+a is red, -a is green, +b is yellow, -b is blue). The shade is proportionately more luminous the greater the value of c*.
In this notation system, L* defines the intensity of the shade. The shade is proportionately more intense the lower the value of L* (0=black, 100=white).
These discoveries form the basis of the present invention.
The subject of the present invention is thus a composition for the oxidation dyein
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