Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions
Reexamination Certificate
2000-04-04
2003-01-07
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
C424S070110, C424S070120, C424S070122, C424S070121, C424S070150, C424S070170
Reexamination Certificate
active
06503494
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 comprising a polysiloxane portion and a portion consisting of a non-silicone organic chain, one of the two portions constituting the main chain of the polymer, the other being grafted onto the said main chain, and at least one thickening polymer or copolymer of (meth)acrylamide or of a (meth)acrylamide derivative, as well as to its applications.
Polymers of the grafted silicone polymer type comprising a polysiloxane portion and a portion consisting of a non-silicone organic chain, one of the two portions constituting the main chain of the polymer, the other being grafted onto the said main chain, are known for their hairstyling properties. They are particularly advantageous in haircare cosmetics since they give the hair hold. However, after they have been applied to the hair, their cosmetic properties are still unsatisfactory. It is observed that after applying these polymers, the hair has a coarse and crisp feel resulting from non-continuous distribution of the polymer along the hair fibres.
The Applicant has found, surprisingly, that the use of a crosslinked or non-crosslinked thickening polymer or copolymer of (meth)acrylamide or of a (meth)acrylamide derivative in haircare compositions containing a polymer of the grafted silicone polymer type comprising a polysiloxane portion and a portion consisting of a non-silicone organic chain, one of the two portions constituting the main chain of the polymer, the other being grafted onto the said main chain, makes it possible to improve, after it has been applied, the deposition of the grafted silicone polymer along the keratin fibres and to improve their cosmetic properties, in particular as regards their feel, 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 comprising a polysiloxane portion and a portion consisting of a non-silicone organic chain, one of the two portions constituting the main chain of the polymer, the other being grafted onto the said main chain, and at least one crosslinked or non-crosslinked thickening polymer or copolymer of (meth)acrylamide or of a (meth)acrylamide derivative.
The grafted silicone polymers according to the invention are preferably chosen from polymers having a non-silicone organic skeleton grafted with monomers containing a polysiloxane, polymers having a polysiloxane skeleton grafted with non-silicone organic monomers and mixtures thereof.
In the following text, in accordance with what is generally accepted, the term silicone or polysiloxane 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 radicals 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).
In the following text, in accordance with what is generally accepted, the expression “polysiloxane macromer” is understood to refer to any monomer containing a polysiloxane-type polymer chain in its structure.
The polymers containing a non-silicone organic skeleton grafted with monomers containing a polysiloxane, in accordance with the present invention, consist of an organic main chain formed from organic monomers containing no silicone, on which is grafted, inside the said chain and optionally on at least one of its ends, at least one polysiloxane macromer.
The non-silicone organic monomers constituting the main chain of the grafted silicone polymer can be chosen from monomers containing ethylenic unsaturation which are polymerizable via a radical route, monomers which are polymerizable by polycondensation, such as those forming polyamides, polyesters or polyurethanes, and monomers which involve ring opening, such as those of the oxazoline or caprolactone type.
The polymers containing a non-silicone organic skeleton grafted with monomers containing a polysiloxane, in accordance with the present invention, can be obtained according to any means known to those skilled in the art, in particular by reaction between (i) a starting polysiloxane macromer which is correctly functionalized on the polysiloxane chain and (ii) one or more non-silicone organic compounds, themselves 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 radical reaction between a vinyl group borne on one of the ends of the silicone with a double bond of a monomer containing ethylenic unsaturation in the main chain.
The polymers containing a non-silicone organic skeleton grafted with monomers containing a polysiloxane, in accordance with the invention, are more preferably chosen from those described in U.S. Pat. Nos. 4,693,935, 4,728,571 and 4,972,037 and patent applications EP-A-0,412,704, EP-A-0,412,707, EP-A-0,640,105 and WO 95/00578. These are copolymers obtained by radical polymerization starting with monomers containing ethylenic unsaturation and silicone macromers having a terminal vinyl group, or alternatively copolymers obtained by reaction of a polyolefin comprising functionalized groups and a polysiloxane macromer having a terminal function which is reacted with the said functionalized groups.
One particular family of silicone polymers which is suitable for carrying out the present invention consists of silicone grafted copolymers comprising:
a) from 0 to 98% by weight of at least one lipophilic monomer (A) of low lipophilic polarity containing ethylenic unsaturation, which is polymerizable via a radical route;
b) from 0 to 98% by weight of at least one polar hydrophilic monomer (B) containing ethylenic unsaturation, which is copolymerizable with the (A)-type monomer(s);
c) from 0.01 to 50% by weight of at least one polysiloxane macromer (C) of general formula:
X(Y)
n
Si (R)
3−m
Z
m
(I)
where:
X denotes a vinyl group which is copolymerizable with the monomers (A) and (B);
Y denotes a divalent bonding group;
R denotes a hydrogen, a C
1
-C
6
alkyl or alkoxy or a C
6
-C
12
aryl;
Z denotes a monovalent polysiloxane unit having a number-average molecular weight of at least 500;
n is 0 or 1 and m is an integer ranging from 1 to 3;
the percentages being calculated relative to the total weight of the monomers (A), (B) and (C).
These polymers are described, along with processes for their preparation, in U.S. Pat. Nos. 4,693,935, 4,728,571 and 4,972,037 and in patent applications EP-A-0,412,704, EP-A-0,412,707 and EP-A-0,6
Cauwet-Martin Daniele
Dubief Claude
Dupuis Christine
Channavajjala Lakshmi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
Page Thurman K.
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