Drug – bio-affecting and body treating compositions – Topical body preparation containing solid synthetic organic... – Skin cosmetic coating
Reexamination Certificate
2001-06-15
2003-05-20
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Topical body preparation containing solid synthetic organic...
Skin cosmetic coating
C424S078170, C424S078180, C424S078310, C424S070100, C424S401000
Reexamination Certificate
active
06565839
ABSTRACT:
The present invention relates to a cosmetic composition forming a film which may have at least one of good resistance to cold water and removability with hot water, comprising at least one film-forming polymer and at least one thermal transition agent. The invention also relates to a cosmetic care or make-up process for keratinous materials, for example, human keratinous materials chosen from skin, eyelashes, eyebrows, hair and nails.
The composition may be in the form chosen, for example, from a mascara, an eyeliner, a product for the lips, a blusher, an eyeshadow, a foundation, a make-up product for the body, a concealer product, a product for the nails, an anti-sun composition, a skin coloring product, and a skincare product. In one embodiment of the invention, the composition is a mascara.
Mascara compositions in the form of a wax-in-water emulsion comprising surfactants are known from document WO-A-95/115741. However, the make-up film obtained with these compositions may not show good water resistance and when the film comes into contact with water, for example when bathing or taking a shower, it may partially disintegrate by being worn away or by spreading around the eyes. The wearing away of the film may give rise to a substantial reduction in the intensity of the color of the make-up, thus obliging the consumer to freshen the application of the mascara. Spreading of the film may form a very unsightly aureole around the area to which make-up has been applied. Tears and perspiration may also cause these same drawbacks.
To promote the water resistance of make-up, it is known practice from U.S. Pat. No. 4,423,031 to use acrylic polymers in aqueous dispersion. However, the mascara may be difficult to remove and may require special make-up removers comprising oils or organic solvents. These make-up removers may be irritating to eyes, for example, they may cause stinging, they may leave a veil over the eyes, or they may leave an uncomfortable greasy residual film on the skin around the eyes (eyelids).
To avoid the use of these special make-up removers, it is possible to use soap and water, as disclosed in document WO-A-96/33690, with a mascara comprising a water-insoluble polymer and a water-soluble film-forming polymer. However, the use of soap may cause eye discomfort by stinging or by depositing a veil over the eyes. Soap may also dissolve the make-up film, which can then spread around the eyes to form unsightly aureoles and skin staining.
The use of hot water, that is to say, water with a temperature of at least 35° C. (temperature measured at atmospheric pressure), ranging, for example, from 35° C. to 50° C., makes it possible to avoid the drawbacks of the make-up removers known hitherto. However, the cold-water-resistant mascara compositions described previously can be difficult to remove with hot water.
The present invention relates to a cosmetic composition which may have at least one of the following properties: may be removed with hot water and may have good cold-water resistance.
The inventors have discovered that such a composition may be obtained using at least one film-forming polymer and at least one thermal transition agent. After applying the composition to keratinous materials, for example, eyelashes, the make-up obtained exhibits at least one of the following properties: good resistance to cold water (water with a temperature less than or equal to 30° C., for example, when bathing), resistance to tears, and resistance to perspiration. The make-up may be easily removed with hot water, for example by rubbing with cotton wool or gauze. The make-up may detach easily from the eyelashes and removed from the eyelashes without fragmenting into forms such as a sheath, fragments, and pieces. The make-up thus removed does not spread on the skin, avoiding the formation of aureoles around the eye. When removing the make-up, the skin remains clean. The make-up may be removed simply with hot water and, for example, with hot water containing no detergent such as soaps. For the make-up removal, the hot water used may be chosen, for example, from tap water, demineralized water, and mineral water brought to a temperature of at least 35° C., such as, for example ranging from 35° C. to 50° C.
One embodiment of the invention is a composition comprising, in a physiologically acceptable medium, at least one film-forming polymer and at least one thermal transition agent which undergoes a change of state at a transition temperature Tt, chosen within a temperature range, for example, from 25° C. to 80° C., the at least one thermal transition agent being not water soluble, as defined below, in water maintained at a temperature below the transition temperature Tt, wherein the at least one film-forming polymer and the at least one thermal transition agent are present in the composition according to the invention an amount, for example, sufficient so that the composition is capable, at the temperature of the keratinous materials, of forming a film having a water uptake (Rc) to hot water, maintained at 40° C., of at least 15%, and a water uptake (Rf) for cold water maintained at 20° C., such that Rc−Rf≧3%, and further wherein said at least one film-forming polymer and said at least one thermal transition agent are the same or different.
One embodiment of the invention is a cosmetic care or make-up process for keratinous materials, comprising the application of a composition as defined above to the keratinous materials.
Another embodiment of the invention is the use of a composition as defined above to obtain a film deposited on the keratinous materials, wherein the composition may have at least one of resistant to cold water and removable with hot water.
Yet another embodiment of the invention is a cosmetic process for removing make-up from made-up keratinous materials with a composition as defined above, comprising at least one step of rinsing the made-up keratinous materials with hot water maintained at a temperature of at least 35° C.
The expression “physiologically acceptable” may be understood to include a medium which is compatible with keratinous materials, for example, a cosmetic medium.
According to the present application, the expression “water uptake of the film” should be understood to indicate the percentage of water absorbed by the film after immersing it for 10 minutes in water with a temperature chosen from 20° C. and 40° C. The water uptake is measured for a layer of composition 300 &mgr;m thick (before drying) placed on a plate and then dried for 24 hours at 30° C. and at 50% relative humidity. Pieces about 1 cm
2
cut from the dry film are weighed (mass measurement M1) and are then immersed in water for 10 minutes. After immersion, the piece of film is wiped to remove the excess water from the surface and is then weighed (mass measurement M2). The difference M2−M1 corresponds to the amount of water absorbed by the film.
The water uptake is equal to [(M2−M1)/M1]×100 and is expressed as a percentage by weight of water relative to the weight of the film.
The composition according to the invention is capable, at the temperature of keratin materials, of forming a film having a water uptake (Rf) for cold water maintained at 20° C. which is less than or equal to 30%, for example less than or equal to 25%, as a further example, less than or equal to 20%, and as a further example less than or equal to 12%.
The film may have a water uptake (Rc) for hot water maintained at 40° C. which may be up to 150%, and may even be up to 100%. When the film is fully dissolved and disintegrated in the hot water, the water uptake value of 150% is then attributed.
In another embodiment, the composition according to the invention may contain little or no emulsifier (surfactant), for example, the emulsifier is present in the composition in an amount less than 0.5% by weight relative to the total weight of the composition. Such a composition has good resistance to cold water.
The term “emulsifier” may indicate any amphiphilic compound chosen from nonionic amphi
Auguste Frederic
de la Poterie Valerie
Mondet Jean
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Fubara Blessing
L'Oreal (S.A.)
Page Thurman K.
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