Drug – bio-affecting and body treating compositions – Live skin colorant containing
Reexamination Certificate
2002-08-09
2004-07-13
Venkat, Jyothsna (Department: 1615)
Drug, bio-affecting and body treating compositions
Live skin colorant containing
C424S064000, C424S401000
Reexamination Certificate
active
06761881
ABSTRACT:
The present invention relates to transparent or translucent cosmetic compositions colored by pigments.
Transparent or translucent cosmetic compositions are usually colored by dyes which are soluble in the cosmetic support and which exhibit the advantage of not scattering light and of thus retaining the properties of transparency of the compositions comprising them. U.S. Pat. No. 3,148,125 discloses transparent lipsticks colored by dyes.
However, the number of dyes, and in particular of fat-soluble dyes, which are authorized for use in cosmetics by various national laws is very limited. The range of colors which it may be hoped to obtain for compositions, in particular anhydrous lipophilic compositions, intended to be applied to all parts of the face or body is for this reason strictly limited.
Another approach for coloring transparent cosmetic compositions has been the use of pigments having sizes markedly lower than the wavelengths of visible light, that is to say lower than 200 nm (i.e., the lowest wavelength of the visible spectrum 400 nm divided by 2), or better still lower than 100 nm. JP 0 220 7014 and EP 79 612 disclose transparent cosmetic compositions comprising pigments with a very small size ranging up to 300 Å. These nanopigments, among which may be mentioned brown and black iron oxides and white titanium dioxides, are, however, also very limited in number and do not make possible the production of a broad range of colors.
Furthermore, the use of these pigments requires very thorough milling and the stability of the compositions over time often proves to be unsatisfactory.
There consequently still exists a need for a method for coloring transparent or translucent cosmetic compositions by physiologically acceptable coloring agents which makes it possible to obtain a wide range of colors while maintaining the transparency of the support.
The inventor has discovered, surprisingly, that it is possible to obtain colored translucent or transparent cosmetic compositions by incorporating, in transparent or translucent cosmetic supports, a very small fraction of pigments having sizes greater than those of the nanopigments used in the art.
A subject matter of the present invention is consequently colored transparent or translucent cosmetic compositions exhibiting a turbidity of less than 800 NTU and comprising, in a transparent or translucent cosmetic base, an amount of less than 0.03% by weight, with respect to the final cosmetic composition, of at least one colored pigment, insoluble in the cosmetic base, having a mean particle size of greater than 100 nm.
The colored pigments which can be used according to the present invention for the coloring of transparent or translucent compositions are chosen from the very great variety of colored inorganic, organic or composite pigments commonly used in the cosmetics field.
Mention may be made, by way of examples of inorganic pigments, of iron oxides, chromium oxide, chromium hydrate, ultramarines (polysulfides of aluminum silicates), cobalt blue, Prussian blue (ferric ferrocyanide), manganese violet, manganese pyrophosphate and some metal powders, such as silver or aluminum powders.
The organic pigments are chosen, for example, from carbon black, thioindigo or flaming red.
The composite pigments which can be used according to the present invention encompass in particular lakes, that is to say salts formed from certain metals (calcium, barium, aluminum, strontium, zirconium and their mixtures) and from organic acid dyes immobilized on an organic support, such as rosin, or on an inorganic support, such as alumina, barium sulfate, calcium carbonate, talc, clay, zinc oxide, titanium dioxide and combinations of these. Mention may be made, as examples of such lakes, of the calcium salt of lithol red B on rosin and barium sulfate (D&C Red No. 7 calcium lake) the aluminum salt of tartrazine on alumina (FD&C Yellow No. 5 aluminum lake), the aluminum salt of eosin on alumina and titanium dioxide (D&C Red No. 21 aluminum lake), the aluminum salt of phloxin B on alumina (D&C Red No. 27 aluminum lake), the aluminum salt of brilliant yellow FCF on alumina (FD&C Yellow No. 6 aluminum lake) and the aluminum salt of brilliant blue on alumina (FD&C Blue No. 1 aluminum lake).
If necessary, the colored pigments described above can be coated with various materials chosen, for example, from silicones, amino acids or fluorinated compounds. Such a coating may be useful, indeed even necessary, for improving the compatibility of the pigments with some cosmetic bases and stabilizing the dispersions obtained over time.
This great variety of pigments which can be used, alone or in combination, for the coloring of transparent or translucent compositions makes it possible to obtain an infinity of hues and thus makes it possible, particularly in the case of anhydrous lipophilic cosmetic bases, to overcome the disadvantage of the restricted range of colors available for compositions comprising dyes soluble in the base.
Another advantage of the transparent or translucent cosmetic compositions of the present invention is related to the size of the particles of the colored pigment or pigments used.
This is because the mean particle size of the pigments used according to the present invention is greater than 100 nm, and preferably greater than 200 nm.
The colored pigments used consequently do not exhibit the problems of instability of the dispersed state of the cosmetic compositions of the prior art comprising nanopigments having a size of less than 100 nm.
The pigments thus dispersed do not require such a thorough, and therefore such a lengthy and expensive, milling as pigments with a size of less than 100 nm.
The transparent or translucent dispersions colored by the pigments indicated above having a mean size of greater than 100 nm exhibit a satisfactory long-term stability and only require small amounts of dispersing agent, indeed even no dispersing agent at all.
The amount of pigments used in the colored transparent or translucent cosmetic compositions of the present invention depends on certain parameters, such as the nature, the mean size and the coloring power of the pigment particles, the hue, the transparency and the color intensity which are desired, or the chemical nature of the cosmetic base used. It is generally a matter of finding the best compromise between minimum turbidity and maximum color intensity.
Generally, the concentration of the colored pigment or pigments in the transparent or translucent cosmetic compositions of the present invention is less than 0.03% by weight, and preferably less than 0.0 1% by weight, with respect to the final cosmetic composition.
In one embodiment of the present invention, the transparent or translucent cosmetic compositions comprise at most 0.001% by weight of colored pigment.
The term “transparent or translucent compositions” according to the present invention is understood to mean compositions exhibiting a turbidity, measured according to the method described below, of less than 800 NTU (Nephelometric Turbidity Units) and preferably of less than 500 NTU.
The turbidity is measured using a model 2100 P turbidimeter from Hach at ambient temperature (20 to 25° C.). The tubes used for the measurement are referenced AR 397 A cat 24347-06. The device is calibrated using formazine suspensions with different concentrations.
Use may be made, as transparent or translucent cosmetic base for the preparation of the colored transparent or translucent cosmetic compositions of the present invention, of any known cosmetic base, provided that it satisfies the transparency requirements indicated above. This is because it is obvious that the cosmetic base used, devoid of colored pigments, must exhibit a transparency or translucency which is sufficient for the value of the turbidity of the final composition colored by pigments not to exceed the limit values indicated above.
The transparent or translucent cosmetic base can be a hydrophilic or lipophilic phase with a liquid, thickened, gelled, pasty or solid consistency. It can, for
L'Oreal
Price D. Douglas
Steptoe & Johnson LLP
Venkat Jyothsna
LandOfFree
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