Drug – bio-affecting and body treating compositions – Face or body powders for grooming – adorning – or absorbing
Reexamination Certificate
2002-07-16
2004-09-21
Venkat, Jyothsna (Department: 1615)
Drug, bio-affecting and body treating compositions
Face or body powders for grooming, adorning, or absorbing
C424S063000, C424S070700, C424S401000
Reexamination Certificate
active
06793916
ABSTRACT:
The present invention relates to a cosmetic makeup and/or care composition for keratin fibres and/or the skin, comprising at least one dispersion of particles comprising an at least partially internal phase of supple type based on supple polymer, and an at least partially external phase of rigid type that is an amorphous material. More especially, the invention relates to the use of at least one particle dispersion comprising an at least partially internal phase based on supple polymer, and an at least partially external phase of rigid type that is an amorphous material, in a cosmetic composition for improving the staying power and level of comfort of a deposit of the said composition, applied to the keratin materials.
The introduction of film-forming compounds into cosmetic compositions, as described, for example, in EP-A-0 775 483, as a dispersion in an aqueous phase, makes it possible to increase the staying power of the products, but often to the detriment of the level of comfort, and usually in a manner that is unacceptable to users. These problems of the level of comfort are partly associated with the mechanical properties of the deposits obtained on the skin. Specifically, cosmetic compositions containing film-forming compounds often create, when they dry on the skin, sensations of tautness that users find unpleasant. Furthermore, it may arise that the intrinsic rigidity of the film-forming compounds, when the film is formed on the skin, is too large, thus giving an unpleasant mask sensation during movements, for example of the face.
In the case of dispersions in a non-aqueous medium, patent application EP-A-0 987 012 describes an improvement in that, to improve the transfer-resistance cosmetic properties relative to the compositions of patent application EP-A-0 749 747, the polymer particles were surface-stabilized in dispersion by means of a stabilizer that may be a block polymer, a polymer grafted with pendant chains or a random polymer, alone or as a mixture. However, the stabilizer may be found in solution during storage of the composition in the jar or during use, which poses problems of homogeneity and thus of stability of the compositions comprising it.
Moreover, if the staying power of the film is promoted, by using a film-forming compound that forms a particularly supple film, there is an appreciable risk of the cosmetic composition containing such a film-forming agent becoming sticky, and thus difficult to use cosmetically, for example due to the appearance of a phenomenon of surface bonding when applied to the skin.
There is thus still a need for compositions that combine staying power and a level of comfort, that are stable and that can be applied to the skin or the lips.
One subject of the invention is, precisely, a cosmetic makeup and/or care composition for mucous membranes and/or the skin, comprising a particle dispersion comprising at least one at least partially internal phase of supple type comprising at least one supple polymer, having at least one glass transition temperature which is less than or equal to 60° C. and preferably less than or equal to 45° C., and at least one at least partially external phase of rigid type, the phase of rigid type being an amorphous material having at least one glass transition temperature which is greater than 60° C. and which is such that the supple polymer is at least partially attached by chemical grafting to the said phase of rigid type.
The expression “glass transition temperature” means the temperature at which the amorphous material passes from a solid vitreous state to a rubbery state. It is measured by a change in specific heat of the material observed. Differential thermal analysis (known as the DTA method) and differential calorimetry (known as DSC for “Differential Scanning Calorimetry”) are methods for measuring such a glass transition temperature, and give substantially identical results. Thus, the glass transition temperature is an item of data measured, for example, from DSC measurement, according to ASTM standard D3418-97. Furthermore, by defining the polymer by means of a glass transition temperature, this means that the polymer can have heterogeneities in its microstructure but its overall behaviour is close to that of the phase of the polymer that has this glass transition temperature.
Surprisingly, the Applicant has found that the application of such compositions gives a deposit with noteworthy cosmetic properties. In particular, such compositions are comfortable when applied, and stay on remarkably well. They do not show any surface stickiness and have very good mechanical qualities once applied to the skin, after drying. In addition, they are stable, i.e. there is no decomposition of the two phases relative to each other, with appearance of macroscopic heterogeneous regions in the packaging or during or after application.
The advantage of such compositions is also that they have properties of absence of migration and of “transfer resistance”. The term “migration” means an overflowing of the composition beyond the initial mark. Specifically, large migration of a cosmetic composition, and in general of the liquid fatty phase that may be present in the said composition, in particular when it is charged with colouring materials, leads to an unattractive effect around the area of application, for example around the eyes, which particularly accentuates wrinkles and fine lines. The composition according to the invention thus makes it possible to limit, especially in hot and humid regions, the migration of parts of the composition into the wrinkles and fine lines, after it has been deposited on the skin. Furthermore, the cosmetic composition, especially the makeup or care composition, according to the invention shows virtually no transfer, i.e. it virtually does not come off, leaving marks, on certain supports with which it may be placed in contact, and especially a glass, an item of clothing or the skin. Consequently, the user does not need to regularly freshen the application of the composition, especially a foundation, and does not have to tolerate the appearance of these unacceptable marks, for example on blouse collars.
The invention applies to makeup products for the lips, for instance lip products such as lipsticks and lip pencils. The invention also applies to care and/or treatment products for the face and/or the body, i.e. the skin, including the scalp, and the lips, for instance care products for the human face or body. The invention also applies to makeup products for skin, of both the human face and body, for instance foundations, concealer products, eyeshadows, face powders and temporary tattoo products. Finally, the invention applies to body hygiene products, for instance deodorants, shampoos and conditioners, to makeup products for the eyes, for instance eye liners and pencils, and also to care and makeup products for keratin fibres, for instance the hair, the eyelashes and the eyebrows, such as mascaras.
In one embodiment of the invention, the said particles containing phases of rigid type and of supple type are film-forming, and they can thus form a film generally at about 30° C., i.e. they have an MFFT (for “minimum film-forming temperature”) of less than or equal to about 30° C. and preferably about 25° C.
The formation of a film at room temperature of the particles according to the invention may require the presence of at least one coalescer or at least one plasticizer in the cosmetic care and/or makeup composition according to the invention, as is known to those skilled in the art. Such a plasticizer is generally a volatile organic compound that remains in the composition during the use and the formation of the film. Such a coalescer is generally a volatile organic compound that evaporates during the use and formation of the film.
According to such an embodiment, the film obtained after drying the composition, generally with spreading for a cosmetic composition, is such that it has a maximum tensile stress (for a percentage of elongation of less than 100%) of less than or equal
Finnegan Henderson Farabow Garrett & Dunner LLP
L'Oreal (S.A.)
Venkat Jyothsna
LandOfFree
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