Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Particulate form
Reexamination Certificate
2000-04-04
2001-09-04
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Particulate form
C424S401000, C424S059000, C424S078030, C514S937000, C514S770000, C514S772300
Reexamination Certificate
active
06284281
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present application relates to a composition, in particular a cosmetic composition, comprising an oily phase and particles of melamine-formaldehyde or urea-formaldehyde resin, to its use as a composition for caring for and/or for making up the skin, in particular for softening defects of the relief of the skin, such as microrelief features, wrinkles or pores, while conferring a natural appearance on the skin, and to its use in treating greasy skin. The application also relates to the use of particles of melamine-formaldehyde or urea-formaldehyde resin as mattifying agent in a cosmetic composition.
2. Discussion of the Background
By definition, a mattifying product is a product which prevents the skin from shining and which gives a uniform complexion. Care compositions for the skin or make-up compositions having mattifying properties are generally used to solve the problems of shininess brought about by an excess of sebum and to improve the long term hold of make-up, which has a tendency to visually deteriorate during the course of the day. They give a matt appearance to the skin, resulting from a light scattering ability at the surface of the skin. They can also be used to soften skin defects, such as microrelief features, wrinkles, fine lines, pores or color variations.
Conventional so-called mattifying compositions generally comprise powders which adsorb sebum and the excess oil of the composition not adsorbed by the skin. Mention may in particular be made, among mattifying powders of natural or synthetic origin, of fillers, such as talc, starch, mica, silica, nylon powders, polyethylene powders, poly(&bgr;-alanine) or poly(methyl (meth)acrylate) powders. Fillers of this type exhibit the disadvantage of giving the skin an unnatural powdery appearance which can even accentuate skin defects. Furthermore, the compositions comprising them generally have a long term desiccating effect and are difficult to spread. Their mattifying effect is not very long lasting.
EP-A-0,502,769 discloses mattifying compositions which contribute a translucent layer and a natural appearance to made-up skin. They are dispersions of spherical particles in a fatty binder in a highly specific filler/binder ratio by weight. A high proportion of powders is necessary for a mattifying effect and, for this reason, these compositions can be desiccating. In addition, they have a tendency to become fluffy during spreading and to give a whitening effect to the skin because of the high concentration of powders.
The need therefore still remains for a mattifying composition which is comfortable during application and which does not result in any irritation or desiccation of the skin after application.
SUMMARY OF THE INVENTION
The Inventors have now found a composition which overcomes the disadvantages discussed above.
The Inventors have discovered, surprisingly, that the use of particles of melamine-formaldehyde or urea-formaldehyde resin in a composition comprising an oily phase confers, on this composition, a matt appearance on the skin, this matt appearance being obtained over a prolonged time and even with a fairly low proportion of particles. Furthermore, the composition obtained is comfortable for and does not dry out the skin.
Accordingly, the present invention provides a composition comprising, in a physiologically acceptable medium, at least one oily phase and particles of at least one resin chosen from melamine-formaldehyde resins and urea-formaldehyde resins.
The present invention also provides a method of cosmetically treating skin, comprising applying the inventive composition to the skin.
The present invention also provides a method of softening imperfections of the relief of the skin and/or for concealing microrelief features, wrinkles, fine lines and/or pores of the skin, comprising applying the inventive composition to the skin.
The present invention also provides a method of producing a matt appearance on skin, comprising applying the inventive composition to the skin.
The present invention also provides a method of concealing defects of the relief of the skin, comprising applying the inventive composition to the skin.
The present invention also provides a method of treating greasy skin, comprising applying the inventive composition to greasy skin.
The present invention also provides a method of preparing the inventive composition, comprising combining the oily phase, resin particles and physiologically acceptable medium.
As used herein, the term “physiologically acceptable medium” refers to a nontoxic medium capable of being applied to the skin (including the inside of the eyelids) or the lips of human beings.
The composition of the invention, by virtue of the presence of the resin particles, makes it possible to give a matt appearance to the skin. A further subject-matter of the invention is consequently the use of particles of at least one resin chosen from melamine-formaldehyde resins and urea-formaldehyde resins as mattifying agent in a cosmetic composition.
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description.
DETAILED DESCRIPTION OF THE INVENTION
The melamine-formaldehyde resins and urea-formaldehyde resins used according to the invention are provided in the form of a powder, the particles of which have a number-average size ranging from approximately 0.1 to 20 &mgr;m, depending on the resin, inclusive of all specific values and subranges therebetween such as 0.2, 0.5, 1, 2, 5, 10, 15 and 18 &mgr;m. The particles of melamine-formaldehyde resin generally have a number-average size ranging from approximately 0.1 to 0.5 &mgr;m and they can form agglomerates ranging up to 5 &mgr;m. The particles of urea-formaldehyde resin generally have a number-average size ranging from approximately 5 to 20 &mgr;m.
Examples of particles of resin which can be used in the composition of the invention, of, for example, the melamine-formaldehyde resins sold under the name Microsilk MP by Grantee, under the name Fluidifiant FL01 by Lafarge or under the name Chrysogyplast PL 100-R by Chryso and the urea-formaldehyde resins sold under the names Pergopak, such as Pergopak M3, by Martinswerk.
The amount of particles of melamine-formaldehyde resin and/or of urea-formaldehyde resin in the composition of the invention may vary over a wide range. The amount can range, for example, from 0.05 to 20% and preferably from 0.1 to 10% by weight with respect to the total weight of the composition. These ranges include all specific values and subranges therebetween, such as 0.2, 0.5, 1, 2, 5, 8, 12 and 15% by weight.
The nature of the oily phase of the composition of the invention is not critical and the oily phase can be composed of any fatty substance, in particular oils, conventionally used in the cosmetics field.
Examples of oils which can be used in the composition of the invention, of, for example, oils of vegetable origin (jojoba, avocado, sesame, sunflower, maize, soybean, safflower or grape seed), mineral oils (liquid petrolatum, optionally hydrogenated isoparaffins), synthetic oils (isopropyl myristate, cetearyl octanoate, polyisobutylene, ethylhexyl palmitate or alkyl benzoates), volatile or nonvolatile silicone oils, such as polydimethylsiloxanes (PDMS) and cyclodimethylsiloxanes or cyclomethicones, in particular cyclohexadimethylsiloxane and cyclopentadiemthylsiloxane, and fluorinated or fluorosilicone oils. The other fatty substances capable of being present in the oily phase can be, for example, fatty acids, fatty alcohols, such as stearyl alcohol, cetyl alcohol and cetearyl alcohol, and waxes.
The composition of the invention can be provided in the form of an anhydrous product or, by adding at least one aqueous phase, in the form of an oil-in-water (O/W) or water-in-oil (W/O) emulsion or of a multiple emulsion. The term “emulsion” refers to both the emulsifier-free dispersions and dispersions comprising emul
Chevalier Veronique
Hurel Valerie
Simon Pascal
Fubara Blessing
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Page Thurman K.
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