Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations – Aromatic acid or derivative containing
Reexamination Certificate
1999-12-20
2001-05-15
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
Aromatic acid or derivative containing
C424S059000, C424S078020, C424S078080, C424S400000, C424S401000
Reexamination Certificate
active
06231839
ABSTRACT:
The present invention relates to compositions which are capable of cosmetic, dermatological, hygienic, or pharmaceutical use, and which can be provided in the form of a gel. Such compositions are capable of being used for caring for and/or making up the skin, semi-mucous membranes (such as the interior of the eyelids), mucous membranes (such as the lips), and/or keratinous substances (such as hair, eyelashes, or nails).
Cosmetic compositions (including make-up compositions such as lipsticks, concealers, or foundations) generally comprise fatty substances, such as oils and waxes, and a particulate phase, generally composed of fillers and pigments. They can thus be provided, for example in the case of lipsticks, in the form of a stick or tube or in the form of a soft paste. They are then often in the form of an anhydrous composition. The make-up compositions can also comprise water or a hydrophilic phase and can then be provided in the form of an oil-in-water, water-in-oil, multiple emulsion, an aqueous solution, or a gel, such as when it is a foundation, tinted cream, care cream, or anti-sun product.
It has been found that when these various cosmetic compositions are applied to the skin, mucous membranes, or semi-mucous membranes, they exhibit the disadvantage of transferring. This is understood as meaning that the composition is capable of being deposited, at least in part, on certain substrates with which it is brought into contact, such as, for example, a glass, an item of clothing, or the skin. On being deposited, the composition leaves a mark on the substrate. The result is thus a mediocre persistence of the composition on the skin or mucous membranes, resulting in the need to regularly renew its application.
Another disadvantage of these compositions lies in the problem of migration. This is because it has been found that certain compositions have a tendency to spread into the fine lines and/or wrinkles of the skin, in the case of foundations; into the fine lines which surround the lips, in the case of lipsticks; or into the folds of the eyelid, in the case of eyeshadows. In the case of, for example, eyeshadows, the appearance of streaks in the make-up, generated by the movements of the eyelids, has also been found. All these phenomena produce an unsightly effect which the consumer very obviously wishes to avoid.
There has therefore been an effort to avoid these various phenomena of transfer and of migration. Provision is thus made, in EP-A-815,843, to introduce into such compositions a crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90%. The composition, thus modified, has a limited transfer and does not migrate over time.
However, other problems have arisen. It has been found that the use of certain solid particles in such compositions such as, for example, uncoated pigments, results in compositions being obtained which are crumbly, unstable, and which are not smooth. Such compositions are unacceptable from a cosmetic viewpoint.
In point of fact, it is advantageous, in terms of formulation, to be able to have available, for example, uncoated pigments. This is because the coating of pigments is generally a difficult, lengthy, and expensive operation. Furthermore, some colors cannot be obtained from coated pigments, as the range of the latter is limited. The use of uncoated pigments therefore makes possible a greater choice of colors and therefore broadened formulation possibilities. It also makes possible easier and cheaper industrial manufacture.
Thus, it would be advantageous to be able to have available compositions, such as cosmetic compositions, including make-up compositions, comprising a crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and uncoated solid particles, with such compositions remaining stable and minimizing the transfer and migration phenomena.
The inventors have found that it is possible, by introducing an oily dispersing polymer into a composition comprising at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and uncoated solid particles, to obtain a composition which not only does not transfer but which, in addition, is particularly stable.
Thus, one embodiment of the present invention is a composition comprising (i) at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90%, (ii) uncoated solid particles, and (iii) an oily dispersing polymer. Such a composition has cosmetic, dermatological, hygienic, or pharmaceutical use.
It is known to use dispersing polymers in order to disperse pigments in paints (see “Developments in Hyperdispersants Technology for Paints”, Dr. J. Toole, ICI Organics Division,
Paint
&
Resin,
February 1985, page 25). However, it was not known that the presence of oily dispersing polymers could render a crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90%, as used in the present invention, compatible with uncoated solid particles, such as uncoated pigments, especially in cosmetic compositions, and that it might thus be possible to obtain stable and noncrumbly compositions which are only slightly subject to transfer and migration phenomena.
Thus, by virtue of the present invention, it is possible to prepare cosmetic compositions, such as emulsified gels, which comprise a significant proportion of uncoated pigments and which transfer slightly or not at all.
The compositions according to the invention correspond fully to the stability standards, i.e.:
resistance to the centrifuging test at 900 g for 1 hour, and
resistance to ageing for 2 months at room temperature (25° C.), as well as at 45° C.
The composition according to the invention meets the following criteria:
it has and retains during these tests a homogeneous, smooth and stable macroscopic and microscopic appearance (finely dispersed globules, absence of separation), and
its viscosity is constant over time.
Furthermore, these compositions are inexpensive and very easy to manufacture, and they retain good cosmetic properties. This is because, for example, they may comprise only uncoated solid particles, such as uncoated pigments, which are inexpensive. They have the advantage of spreading easily over the skin, they are soft, and they are not sticky. They also provide a feeling of freshness upon application. In addition, transfer and migration is minimized, if not prevented, and they exhibit very good hold over time. The make-up obtained is homogeneous and exhibits a natural appearance.
A further embodiment of the present invention is a process for the treatment of the skin and/or scalp, such as a make-up process, comprising applying, to the skin or mucous membranes and/or scalp, a cosmetic composition as defined above.
An additional embodiment of the present invention is the cosmetic use of an oily dispersing polymer in a composition comprising a crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and uncoated solid particles, with the aim of stabilizing the said composition.
Another embodiment of the present invention is the use of an oily dispersing polymer in the preparation of a composition comprising a crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and uncoated solid particles, with the aim of stabilizing the said composition.
A still further embodiment of the present invention is the use of an oily dispersing polymer in a stable and transfer-free composition comprising a crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and uncoated solid particles.
Another embodiment of the invention is a process for stabilizing a composition comprising a crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and uncoated solid particles, which process comprises introducing an oily dispersing polymer into the said composition.
Other characteristics, aspects
Favre Sophie
Terren Nadia
Dodson Shelley A.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal
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