Drug – bio-affecting and body treating compositions – Bleach for live hair or skin
Reexamination Certificate
1994-03-25
2001-08-14
Bawa, Raj (Department: 1619)
Drug, bio-affecting and body treating compositions
Bleach for live hair or skin
C424S616000, C424SDIG003, C132S208000, C252S062200
Reexamination Certificate
active
06274125
ABSTRACT:
The present invention relates to a granulated composition based on peroxidized derivatives, which may be used for bleaching hair, and a process for the preparation of the said composition.
It is known to bleach hair with the aid of a paste obtained by mixing, at the time of application to the hair, a bleaching composition based on peroxidized derivatives with water or, better still, with hydrogen peroxide. The bleaching composition consists, in a known manner, of a peroxidized derivative, generally a persulphate or a perborate of sodium, potassium or ammonium and sometimes a percarboxylic acid salt or a peroxide of, for example, barium or strontium. These compositions also contain, in a known manner, strongly alkaline agents such as alkali metal or alkaline-earth metal metasilicates, phosphates or carbonates; they may also contain other additives: agents for controlling the release of oxygen during the mixing with hydrogen peroxide, such as magnesium carbonate or magnesia; surface-active agents, such as fatty alcohol sulphates, alkyl sulphates and alkylbenzenesulphonates; thickening agents, such as cellulose derivatives, for example carboxymethyl cellulose, starch and its derivatives, guar gum, xanthan gum and alginates; blue or violet colouring agents and perfumes. Such bleaching compositions are described, for example, in “The science of hair care” by C. Zviak, Marcel Dekker Inc. 1986, pages 225 and 226.
The bleaching composition is often used in the form of a powder of small particle size, which makes possible an easy and rapid dissolution in hydrogen peroxide. However, these pulverulent compositions have several disadvantages. In the first place, the pulverulent compositions consist of powders having different apparent densities and, in the course of their handling and their storage, separation of the constituents occurs, the heavier collecting at the lower part of the packaging in which the composition is contained and the lighter in the upper part; as a consequence, during withdrawal of the composition in order to mix it with hydrogen peroxide, the volumes taken at the upper part of the packaging and those taken at the lower part have different compositions and, therefore, a different bleaching power. In the second place, the compositions in pulverulent form give off, during their handling, dusts which contain peroxidized derivatives and are, as a consequence, strongly irritating to the lungs.
In order to resolve this problem, it has already been proposed to place the bleaching composition in granulated form.
According to WO-A 92/03120, it has been proposed to granulate a persulphate and to mix it with optionally granulated particles of the various other constituents of the composition. Granulation of the persulphate may be performed either by spraying and drying an aqueous persulphate solution optionally containing surface-active agents or water-soluble thickening agents, or by spraying a solution of surface-active agent or of thickening agent onto a moving bed of solid persulphate. If this process, as presumed, makes it possible to avoid the formation of irritating persulphate dusts, it certainly does not make it possible to resolve the problem of the separation of the particles of the various constituents of the bleaching composition.
In FR-A 2,044,324, it has been proposed to granulate the constituents of the pulverulent bleaching composition collectively with the aid of a binder: polyvinylpyrrolidone or glucose dissolved in an aqueous, aqueous-alcoholic or alcoholic medium. The problem of the separation of the various constituents of the bleaching composition is thereby resolved, since the various constituents are present in the same granule. However, it has been observed that the use of polyvinylpyrrolidone alone as binder gives hard, but nevertheless crumbly, granules which, on repeated rubbing, form fine dusts which are capable of being carried into the atmosphere in particular at the time of use. Furthermore, granules of high particle size between 1 and 6 mm are obtained, which increases the dissolution time and gives, on mixing with hydrogen peroxide, a paste which remains granular for a long time and the application of which is unpleasant; furthermore, on application to hair this paste runs the risk of giving inhomogeneous and non-reproducible bleaching. In order to improve the use of the granules obtained according to FR-A 2,044,324, it has been attempted to grind them, but irritant dusts are formed in the course of the grinding. In addition, grinding increases the cost of the granules.
According to the present invention, it has been found that by using a specific binder, namely a polypropylene glycol of determined molecular weight, optionally mixed with at least one polyalkylene glycol having a C
2
or C
4
alkylene group of determined molecular weight, granules are obtained which form practically no dust by rubbing. In addition, granulation makes it possible to obtain granules of particle size between 65 &mgr;m and 800 &mgr;m in higher yield, these granules dissolving readily in hydrogen peroxide to give a homogeneous and creamy paste which is easy to apply to hair. In addition, it should be noted that it is possible to grind the granules having a particle size greater than 800 &mgr;m without any irritant dust being formed.
As a consequence, the subject of the present invention is a granulated composition based on peroxidized derivatives which may be used for bleaching hair, in which the granules have been obtained by granulation of a mixture of its various pulverulent constituents by means of a binder, characterized in that the said binder comprises polypropylene glycol of molecular weight between 200 and 10,000, preferably between 2,000 and 8,000, the granules having a particle size between 65 &mgr;m and 800 &mgr;m.
According to the present invention, polypropylene glycol may be used as a binder, alone or mixed with a small quantity of at least one polyalkylene glycol having a C
2
or C
4
alkylene group (hereinafter called “C
2
or C
4
polyalkylene glycol”) of molecular weight between 200 and 30,000;the polyalkylene glycol may thus be polyethylene glycol and/or polybutylene glycol. The polyethylene glycol preferably has a molecular weight between 200 and 4,000, and the polybutylene glycol has a molecular weight between 200 and 30,000.
According to the invention, the overall binder concentration (polypropylene glycol alone or mixture of polypropylene glycol and C
2
or C
4
polyaklylene glycol(s)) preferably does not exceed 25% by weight relative to the total weight of the composition. The polypropylene glycol concentration is advantageously between 10 and 20% by weight relative to the total weight of the composition. The concentration of C
2
or C
4
polyalkylene glycol(s) mixed with polypropylene glycol preferably does not exceed 5% by weight relative to the total weight of the composition.
According to the invention, the granulated composition must have a particle size between 65 &mgr;m and 800 &mgr;m. In fact, when the particle size is greater than 800 &mgr;m the granules begin to dissolve in the hydrogen peroxide with difficulty and their dissolution cannot be made complete; the paste obtained is granular and not homogeneous. When the composition has a particle size lower than 65 &mgr;m, irritant dusts are formed during the handling of the bleaching composition in granulated form.
According to the present invention, it has also been found that easier dissolution in hydrogen peroxide is achieved for granulated compositions containing at least one lubricating agent from the family of cellulose derivatives, preferably sodium carboxymethyl cellulose or hydroxypropylmethyl cellulose and/or at least one lubricating agent from the family of alkali metal or alkaline-earth metal or polyol stearates. The polyol stearates are preferably chosen from glycol stearate and glycerol stearate. A mixture of potassium stearate and glycerol stearate is preferably used. In fact, in the presence of lubricating agent(s), the granules are less hard and less crumbly. The qu
Gaboriaud Anne
Millequant Jean-Marie
Tricaud Caroline
Bawa Raj
L'Oreal
Nixon & Vanderhye P.C.
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