Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-10-13
2004-03-09
Wang, Shengjun (Department: 1617)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S047000, C424S070110, C514S844000, C514S943000
Reexamination Certificate
active
06703028
ABSTRACT:
The present invention relates to an aqueous or aqueous/alcoholic cosmetic composition containing an aqueous dispersion of insoluble film-forming polymer particles and an insoluble silicone, the polymer particles being present at a concentration greater than 15% by weight, relative to the total weight of the composition.
The invention also relates to a cosmetic treatment process using these compositions and to the use of an insoluble silicone for improving the quality of the spraying of a cosmetic composition containing an aqueous dispersion of insoluble film-forming polymer particles.
Hair compositions to be sprayed onto hair are essentially composed of a solution, most often aqueous/alcoholic, and of a polymer, optionally as a mixture with various cosmetic adjuvants. This solution is packaged either in a pump-action spray or in an appropriate aerosol container which is pressurized using a propellant gas.
For a number of years, very particular interest has been displayed in producing essentially aqueous cosmetic hair compositions. In fact, the use of alcohol, such as ethanol or isopropanol, alone or as a mixture with a small proportion of water, can exhibit certain disadvantages, in particular an increase in flammability when the composition is in the form of an aerosol lacquer.
More generally, a search is under way to reduce the use of compounds known as VOCs (Volatile Organic Compounds), which are volatile at atmospheric pressure, which are present in cosmetic compositions. The VOCs are mainly propellants and certain solvents, such as ethanol.
In order to decrease the amount of VOC, attempts have been made to replace solvents, such as ethanol, by water. However, while the majority of water-soluble film-forming polymers can, in solution in water, result in the production of hair fixing compositions, the latter exhibit major disadvantages.
Thus, the essentially aqueous compositions of these polymers do not make it possible to obtain high degrees of fixing. It has certainly been proposed to use these water-soluble polymers at high concentrations, but the increase in concentration causes such an increase in the viscosity of the compositions that it is only with great difficulty that satisfactory spraying can be obtained. Even if correct spraying is obtained, these aqueous compositions exhibit a particularly long drying time compared to alcoholic compositions and are therefore of little practical interest.
It has also been proposed to use aqueous dispersions of insoluble polymer particles instead of polymers dissolved in aqueous, alcoholic or aqueous/alcoholic compositions. However, to date, the results obtained are still not satisfactory.
In particular, the inventors have observed that, when attempts have been made to use high concentrations of polymer particles in aqueous dispersion, the spraying of the spray is not satisfactory. The sprayed liquid particles are not fine, the spray is often narrow, that is to say non-diffuse, and spraying is uneven. Moreover, the spraying orifice has a tendency to become blocked.
As the spraying is an essential component in the final quality of a composition to be sprayed onto hair, it is essential to overcome these disadvantages in order to obtain good distribution of the spray over the whole of the hair.
The inventors have now discovered that a cosmetic composition containing, in a cosmetically acceptable medium, an aqueous dispersion of insoluble polymer particles and an insoluble silicone, the polymer particles being present at a concentration greater than 15% by weight, relative to the total weight of the cosmetic composition, and the glass transition temperature of the insoluble polymer particles of the composition ranging from 15 to 35° C., makes it possible to overcome the disadvantages described above, that is to say the composition can be easily and correctly sprayed.
The compositions according to the invention make it possible to obtain good spraying; the spray is even and the sprayed drops are fine. The compositions are readily distributed over the whole of the hair. Moreover, surprisingly, the shape-retention power of the compositions is not decreased by the addition of a silicone. Finally, the drying times are low.
The subject of the present invention is therefore a cosmetic composition comprising, in a cosmetically acceptable aqueous or aqueous/alcoholic medium, an aqueous dispersion of insoluble polymer particles and an insoluble silicone, the polymer particles being present at a concentration greater than 15%, relative to the total weight of the cosmetic composition, and a glass transition temperature of the insoluble polymer particles of the composition ranging from 15 to 35° C.
Preferably, the insoluble silicone is present in an amount sufficient to obtain a fine, diffuse, and even spray.
The invention also relates to the use of an insoluble silicone (i.e. insoluble in an aqueous or aqueous/alcoholic medium) for improving the quality of the vaporization/spraying of a cosmetic composition containing, in a cosmetically acceptable aqueous or aqueous/alcoholic medium, an aqueous dispersion of insoluble polymer particles, the polymer particles being present at a concentration greater than 15%, relative to the total weight of the cosmetic composition and the glass transition temperature of the insoluble polymer particles of the composition ranging from 15 to 35° C.
The compositions according to the invention exhibit, in addition to the above-mentioned advantages, a good shape-retention power, a good resistance to moisture, good removal on shampooing and on brushing and a good rate of drying.
However, other characteristics, aspects or advantages of the invention will become more completely apparent on reading the detailed description which will follow, and the concrete but in no way limiting examples intended to illustrate it.
The aqueous dispersions of insoluble polymer particles which can be used according to the invention are generally obtained by suspension or emulsion polymerization or copolymerization of monomers according to processes which are well known in the state of the art (such dispersions are also known under the name of “latex”).
The aqueous dispersions can result in particular from the polymerization or copolymerization of monomers such as styrene, butadiene, ethylene, propylene, vinyltoluene, vinyl propionate, vinyl alcohol, acrylonitrile, chloroprene, vinyl acetate, urethanes, isoprene, isobutene, vinyl ether, vinylpyrrolidone, vinylimidazole and acrylic or methacrylic, maleic, crotonic or itaconic acids, their esters or their amides.
According to the invention, it is possible, for example, to use an aqueous dispersion comprising an acrylic copolymer formed from:
(a) approximately 35 to 74% by weight of an alkyl acrylate;
(b) approximately 25 to 65% by weight of alkyl methacrylate; and
(c) approximately 1 to 15% by weight of one or a number of ethylenic carboxylic acids having from 3 to 5 carbon atoms, wherein the alkyl radicals have from 1 to 5 carbon atoms and the percentages being expressed by weight are relative to the total weight of copolymer.
The alkyl acrylate is preferably chosen from methyl acrylate, ethyl acrylate, propyl acrylate and butyl acrylate. Ethyl acrylate is more particularly preferred.
The concentration of alkyl acrylate more preferably ranges from 40 to 70% by weight and even more preferably from 50 to 60% by weight, relative to the total weight of the copolymer.
The alkyl methacrylate is preferably chosen from methyl methacrylate, ethyl methacrylate, propyl methacrylate and butyl methacrylate. Methyl methacrylate is more particularly preferred.
The concentration of alkyl methacrylate more preferably ranges from 30 to 50% by weight, and even more preferably from 30 to 40% by weight, relative to the total weight of the copolymer.
The preferred ethylenic carboxylic acids are acrylic acid, methacrylic acid, crotonic acid, itaconic acid or their mixtures. Acrylic acid and methacrylic acid are more particularly preferred.
According to the invention, it is possible to use salts of these carboxyli
Bauer Daniel
Samain Henri
Sturla Jean-Michel
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
Wang Shengjun
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