Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
1999-09-03
2002-04-09
Einsmann, Margaret (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S431000, C008S654000
Reexamination Certificate
active
06368360
ABSTRACT:
The present invention relates to a dye composition, in particular a lightening dye composition, for keratin fibers, and in particular human keratin fibers, comprising at least one direct dye chosen from the group formed by dyes containing an optionally delocalizable quaternized nitrogen atom and a —Z═N— bond, in which Z denotes a nitrogen atom or a —CH— radical. The invention also relates to the use of such a composition in the above-mentioned application.
It is known to dye keratin fibers, and in particular human hair, with dye compositions containing direct dyes according to a so-called “direct dyeing” process. This process involves applying to the keratin fibers dye molecules that have an affinity for the fibers, leaving the fibres to stand, and then rinsing the fibers. This process allows shading of the color of the keratin fibers to be obtained. It is also known to dye keratin fibers, and in particular human hair, with dye compositions containing oxidation dye precursors (ortho- or para-phenylenediamines and ortho- or para-aminophenols, generally referred to as “oxidation bases”) and couplers (meta-phenylenediamines, meta-aminophenols and meta-diphenols, also referred to as color modifiers, which allow the “base” colors obtained by the condensation products of the oxidation bases to be modified and enriched with glints), according to a so-called “oxidation dyeing” process.
The oxidation dyeing process usually involves lightening, that is to say that it involves applying to the keratin fibers, at basic pH, a mixture of bases and couplers and aqueous hydrogen peroxide solution, leaving the applied mixture to stand on the hair and then rinsing the hair. It allows, particularly in the case of hair dyeing, the melanin to be lightened and the hair to be dyed.
Lightening the melanin has the advantageous effect of creating a unified coloration in the case of grey hair, and, in the case of naturally pigmented hair, of bringing out the color, that is to say of making it more visible.
An oxidizing agent and, in particular, an aqueous hydrogen peroxide solution, and a basifying agent are used to obtain this lightening. A lightening of the melanin ranging from ¾ of a tone to more than 2 tones can be brought about as a function of the concentrations of aqueous hydrogen peroxide and of basifying agent, and also as a function of the nature of the basifying agent. In the case of gentle lightenings, the desired lightening is obtained in the course of superpositions.
In the so-called oxidation dyeing of hair, the use of oxidation bases sometimes leads to problems of sensitization of the scalp. In this case, if it is nevertheless desired to dye the hair, it is then possible only to use direct dyeing, with its drawbacks, in particular that of no longer obtaining the tinting effects of oxidation dyeing since conventional direct dyeing is, by itself, not lightening.
It has already been attempted in the past to obtain lightening dyes, by replacing the oxidation bases and the couplers with direct dyes. However, all the results obtained were less than optimal.
Accordingly, it was proposed to dye the hair with dye compositions based on nitro direct dyes and/or dispersed azo dyes and ammoniacal aqueous hydrogen peroxide (see in this respect French patent no. FR-1,584,965 and Japanese patent no. JP-062,711,435) by applying to the hair a mixture of the dyes and the oxidizing agent, which is prepared just before use. However, the colorations obtained did not prove to be sufficiently fast and disappeared on shampooing, allowing the lightening of the hair fibre to emerge. Such a coloration becomes aesthetically unpleasant by changing over time.
It has also been proposed to dye the hair with compositions based on cationic direct dyes of oxazine type and ammoniacal aqueous hydrogen peroxide (see in this respect Japanese patents JP-53 95693 and JP-55 022638) by applying to the hair, in a first step, ammoniacal aqueous hydrogen peroxide, and then, in a second step, a composition based on the oxazine direct dye. The coloration obtained is not satisfactory, on account of the fact that it requires a process which is made too slow by the standing times of the two successive steps. If, moreover, a mixture, prepared at the time of use, of the oxazine direct dye with ammoniacal aqueous hydrogen peroxide is applied to the hair, the hair fibre is not dyed or, at best, a coloration which is virtually nonexistent is obtained.
Moreover, the Inventor has performed tests to dye the hair with dye compositions based on anionic sulfonic dyes (which are themselves reputed for the excellent fastness) and on ammoniacal aqueous hydrogen peroxide, by applying to the hair a mixture of the dyes and the oxidizing agent, which is prepared just before use. However, in this case, no coloration of the hair fibre was observed.
Now, after considerable research has been conducted in this direction, the Inventor has discovered that it is possible to obtain dyes, in particular lightening dyes, with specific and suitably selected direct dyes, which are fast, homogenous and do not change on washing, by using a mixture which is prepared at the time of use, at basic pH, of an oxidizing agent and at least one direct dye which is chosen from those containing both an optionally delocalizable quaternized nitrogen atom and a —Z═N— bond, in which Z denotes a nitrogen atom or a —CH— radical. This discovery forms the basis of the present invention.
One subject of the present invention is thus a dye composition, in particular a lightening dye composition, for keratin fibers, and in particular for human keratin fibers such as the hair, of the type comprising, in a medium which is suitable for dyeing, at least one direct dye to be mixed at the time or use, at basic pH, with an oxidizing composition, and which is characterized in that it has a basic pH and in that it contains, as the direct dye, at least one dye containing an optionally delocalizable quaternized nitrogen atom and a —Z═N— bond in which Z denotes a nitrogen atom or a —CH— radical.
The dyes used in accordance with the present invention make it possible to achieve homogenous and fast colorations which remain aesthetic over time, since they do not change either over time or on washing. They are furthermore produced very rapidly, and in particular in a standing time of the dye/oxidizing agent mixture of five minutes. In addition, they communicate an especially shiny appearance and a natural feel without overloading, in particular on hair fibers.
Another subject of the present invention relates to a process for dyeing, and in particular lightening, keratin fibers, in particular human keratin fibers such as the hair, which involves applying to those fibers at least one composition (A) containing, in a medium which is suitable for dyeing, at least one direct dye containing an optionally delocalizable quaternized nitrogen atom and a —Z═N— bond in which Z denotes a nitrogen atom or a —CH— radical, the lightening being ensured, at basic pH, using an oxidizing agent which is mixed with the composition (A) just prior to use, or which is present in a separate composition (B) that is applied simultaneously.
Another subject of the invention is multi-compartment dyeing devices or “kits”, the first compartment of which contains at least one direct dye containing an optionally delocalizable quaternized nitrogen atom and a —Z═N— bond in which Z denotes a nitrogen atom or a —CH— radical, as well as a basifying agent, and the second compartment of which contains an oxidizing agent. Another alternative “kit” is composed of a first compartment containing at least one direct dye as mentioned above, a second compartment containing a basifying agent and a third compartment containing an oxidizing agent.
The invention also relates to a “ready-to-use composition”, characterized in that it contains, in a medium which is suitable for dyeing, at least one direct dye containing an optionally delocalizable quaternized nitrogen atom and a —Z═N— bond, in which Z denotes a nitrogen atom or
Einsmann Margaret
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
LandOfFree
Method for dyeing keratin fibres with a dye composition... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for dyeing keratin fibres with a dye composition..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for dyeing keratin fibres with a dye composition... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2856741