Drug – bio-affecting and body treating compositions – Solid synthetic organic polymer as designated organic active...
Reexamination Certificate
2000-06-08
2003-10-07
Dees, Jose' G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Solid synthetic organic polymer as designated organic active...
C424S070120, C424S070110, C424S070210, C424S070220, C424S070270, C424S070310
Reexamination Certificate
active
06630136
ABSTRACT:
The present invention relates to a cosmetic or dermatological composition for treating keratin substances, in particular human hair, this composition comprising at least one grafted silicone polymer containing a polysiloxane skeleton grafted with non-silicone organic monomers and at least one amphiphilic polymer containing at least one fatty chain and at least one hydrophilic unit.
The polymers of the grafted silicone polymer type containing a polysiloxane skeleton grafted with non-silicone organic monomers are known in the prior art for their hairstyling properties. They are particularly advantageous in haircare cosmetics since they give the hair hold. However, when they are applied to the hair their cosmetic properties are unsatisfactory. It is observed that the hair has a coarse and crisp feel after these polymers have been applied, resulting from a non-continuous distribution of the polymer along the hair fibres.
The Applicant has observed that certain standard thickeners such as, for example, crosslinked poly(acrylic acid) homopolymers, used in haircare compositions containing these particular polymers have a tendency to lower the viscosity of the composition and do not allow the distribution of the composition along the wet or dry hair fibres to be improved appreciably, nor do they allow the softness to the touch or the disentangling properties to be improved appreciably after it has been applied.
The Applicant has found, surprisingly, that the use of an amphiphilic polymer containing at least one fatty chain and at least one hydrophilic unit, as a thickener in haircare compositions containing a polymer with a polysiloxane skeleton grafted with non-silicone organic monomers makes it possible not only to increase the viscosity of the medium of these compositions appreciably but also to improve, on application, the deposition of the grafted silicone polymer along the keratin fibres and to improve their cosmetic properties, especially as regards the feel and the disentangling, while at the same time retaining the styling properties of the grafted silicone polymer.
The composition according to the invention is thus essentially characterized in that it contains, in a cosmetically or dermatologically acceptable medium, at least one grafted silicone polymer containing a polysiloxane skeleton grafted with non-silicone organic monomers and at least one amphiphilic polymer containing at least one fatty chain and at least one hydrophilic unit.
In the following text, in accordance with what is generally accepted, the term silicone polymer is understood to denote any organosilicon polymer or oligomer having a linear or cyclic, branched or crosslinked structure of variable molecular weight, obtained by polymerization and/or polycondensation of suitably functionalized silanes, and consisting essentially of a repetition of main units in which the silicon atoms are linked together by oxygen atoms (siloxane bonding ≡Si—O—Si≡), optionally substituted hydrocarbon radicals being linked directly via a carbon atom to the said silicon atoms. The most common hydrocarbon radicals are alkyl radicals, especially C
1
-C
10
alkyl radicals, and in particular methyl, fluoroalkyl radicals, aryl radicals and in particular phenyl, and alkenyl radicals and in particular vinyl; other types of radicals which can be linked, either directly or via a hydrocarbon radical, to the siloxane chain are, especially, hydrogen, halogens and in particular chlorine, bromine or fluorine, thiols, alkoxy radicals, polyoxyalkylene (or polyether) radicals and in particular polyoxyethylene and/or polyoxypropylene, hydroxyl or hydroxyalkyl radicals, substituted or unsubstituted amine groups, amide groups, acyloxy or acyloxyalkyl radicals, hydroxyalkylamino or aminoalkyl radicals, quaternary ammonium groups, amphoteric or betaine groups, anionic groups such as carboxylates, thioglycolates, sulphosuccinates, thiosulphates, phosphates and sulphates, needless to say this list not being limiting in any way (so-called “organomodified” silicones).
According to the present invention, the silicone polymer(s) which must be used is (are) those which comprise a main silicone chain (or polysiloxane (≡Si—O—)
n
) on which is grafted, inside the said chain as well as, optionally, on at least one of its ends, at least one organic group containing no silicone.
These silicone polymers can be existing commercial products or can be obtained according to any means known to those skilled in the art, in particular by reaction between (i) a starting silicone which is correctly functionalized on one or more of these silicon atoms, and (ii) a non-silicone organic compound which is itself correctly functionalized with a function which is capable of reacting with the functional group(s) borne by the said silicone, forming a covalent bond; a classic example of such a reaction is the hydrosilylation reaction between ≡Si—H groups and vinyl groups CH
2
═CH—, or alternatively the reaction between thio functional groups —SH with these same vinyl groups.
Examples of silicone polymers which are suitable for carrying out the present invention, as well as their specific mode of preparation, are described in particular in patent applications EP-A-0,582,152, WO 93/23009 and WO 95/03776, the teachings of which are included in their entirety in the present description by way of non-limiting references.
According to a particularly preferred embodiment of the present invention, the silicone polymer which is used comprises the result of the radical copolymerization between, on the one hand, at least one non-silicone anionic organic monomer having ethylenic unsaturation and/or a non-silicone hydrophobic organic monomer having ethylenic unsaturation, and, on the other hand, a silicone having in its chain at least one functional group capable of reacting with the said ethylenic unsaturations of the said non-silicone monomers, forming a covalent bond, in particular thio functional groups.
According to the present invention, the said anionic monomers containing ethylenic unsaturation are preferably chosen, alone or as a mixture, from linear or branched, unsaturated carboxylic acids, optionally partially or totally neutralized in the form of a salt, it being possible for this (these) unsaturated carboxylic acid(s) to be, more particularly, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, fumaric acid and crotonic acid. The suitable salts are, in particular, alkali metal salts, alkaline-earth metal salts and ammonium salts. It will likewise be noted that, in the final grafted silicone polymer, the organic group of anionic nature which comprises the result of the radical (homo)polymerization of at least one anionic monomer of unsaturated carboxylic acid type can, after reaction, be post-neutralized with a base (sodium hydroxide, aqueous ammonia, etc) in order to bring it into the form of a salt.
According to the present invention, the hydrophobic monomers containing ethylenic unsaturation are preferably chosen, alone or as a mixture, from acrylic acid esters of alkanols and/or methacrylic acid esters of alkanols. The alkanols are preferably C
1
-C
18
and more particularly C
1
-C
12
. The preferred monomers are chosen from the group consisting of isooctyl (meth)acrylate, isononyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, isopentyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, methyl (meth)acrylate, tert-butyl (meth)acrylate, tridecyl (meth)acrylate and stearyl (meth)acrylate, or mixtures thereof.
One family of grafted silicone polymers which is particularly suitable for carrying out the present invention consists of silicone polymers containing in their structure the unit of formula (I) below:
in which the radicals G
1
, which may be identical or different, represent hydrogen or a C
1
-C
10
alkyl radical or alternatively a phenyl radical; the radicals G
2
, which may be identical or different, represent a C
1
-C
10
alkylene group; G
3
represents a polymer residue resulting f
Dubief Claude
Dupuis Christine
Dees Jose' G.
Finnegan Henderson Farabow Garrett & Dunner LLP
L'Oreal
Williamson Michael A.
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