Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-11-10
2002-06-11
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S061000, C424S064000, C424S069000, C424S070100, C424S070700
Reexamination Certificate
active
06403107
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to cosmetic compositions containing a yellow pigment of intense, saturated color which does not generate free radicals. More particularly, the invention relates to make-up compositions for the skin both of the human face and body, the lips and superficial body growths such as the nails, the eyelashes, the eyebrows and the hair.
2. Description of the Background
Make-up compositions such as foundations, face powders, eyeshadows, lipsticks, concealers, blushers, mascaras, eyeliners, lip pencils, eye pencils and nail varnishes and make-up products for the body consist of a suitable vehicle and coloring agents of various natures, intended to impart to these compositions a certain color, before and/or after applying them to the skin, the lips and/or the superficial body growths.
These coloring agents can be lakes, inorganic or organic pigments and/or pearlescent pigments, and alternatively dyes. In the range of yellow pigments, cosmeticians have available pigments of inorganic origin such as yellow iron oxides and pigments of organic origin. Inorganic pigments, and in particular inorganic oxides, have the advantage of being relatively stable, but have the drawback of imparting rather dull, pale colors to the material being colored. Organic lakes have the advantage of imparting lively colors to the compositions, but are mostly unstable with respect to light, temperature or pH. Some of these lacquers also have the drawback of leaving unsightly marks on the skin or the nails after application, by running of the dye. As for pearlescent pigments, they allow varied, but never intense, colors to be obtained, with iridescent effects, but these are usually fairly weak.
Moreover, certain coloring agents have the drawback of generating free radicals in make-up formulations, which modify the color of the applied make-up and the stability of the compositions, and then on the skin after application, which promotes ageing of the skin such as the appearance of wrinkles, fine lines and yellowing of the skin. In particular, yellow iron oxides often promote the oxidation of polyunsaturated oils such as plant oils, which limits the range of compositions. Coloring agents which exhibit this drawback include, in particular, brown-yellow iron oxide mixtures sold under the trade name “Sicovit Yellow 10 E 172” by BASF, for example, pigments of organic origin and the aluminium lake of tartrazine on alumina (20/80) (CI: 19140, CI:77002) sold under the trade name FD & C Yellow 5 by Warner Jenkinson.
At the present time, in order to overcome this problem, antioxidants such as ethoxyquine, for example, are used. Unfortunately, it is often difficult to find an antioxidant which is 100% effective given the multitude of ingredients present in make-up compositions. Furthermore, the antioxidants themselves often generate degradation products including the oxidation of the antioxidant which can cause interference.
SUMMARY OF THE INVENTION
Accordingly, one object of the present invention is to provide, for use in a cosmetic composition, a specific yellow pigment of intense, saturated color, which is stable and which has the advantage of generating far fewer free radicals than the conventional pigments employed in particular for imparting a yellow color to cosmetic compositions.
Briefly, this object and other objects of the present invention as hereinafter will become more readily apparent can be attained by a colored composition for topical application, which comprises a hydrophilic continuous phase comprising bismuth vanadate as a coloring agent.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Surprisingly, it has now been found that bismuth vanadate (BiVO
4
) limits the production of free radicals, since it has the property of generating very few free radicals, and thus permits a limitation on the amounts of antioxidants which are used in compositions. In addition, the pigment of the invention makes it possible to achieve an intense coloration of a composition containing the colorant and, in particular, a very bright, intense lemon-yellow color of very great color purity, which does not run on keratin substances and is stable with respect to light, pH and temperature. In addition, the pigment broadens the color range which can be achieved in the cosmetics field and participates in the creation of vivid greens by mixing bright oranges with blues. Furthermore, the pigment reduces the amount of pigment which needs to be incorporated in a cosmetic composition in comparison to the amounts of conventional pigment needed in conventional prior art cosmetic formulations, thus making it possible to preserve the sheen of the composition, as well as that of the film deposited, which is highly desired for nail varnishes and make-up products for the lips.
More specifically, an aspect of the present invention is a colored composition for topical application, which contains a hydrophilic continuous phase and more especially a cosmetic make-up composition containing a hydrophilic continuous phase containing bismuth vanadate (BiVO
4
) as coloring agent and more specifically, as a pigment. This pigment can be in a pure form or deposited on substrate. In particular, this pigment in pure form is sold by BASF under the name Sicopal Gelb L1100.
The manufacture of this pigment is, in particular, described in EP 0 551 637 and EP 0 632 110 of BASF. The pigment has a particle size of about 0.3 &mgr;m.
Bismuth vanadate can crystallize in various forms and in so doing expresses different yellow tones. Thus, the monoclinic lattice form, fergusonite, is a bright yellow having a density of 6.959; the tetragonal lattice form, zircon, is pale yellow having a density of 6.127; the tetragonal lattice form, scheelite, is bright yellow having a density of 6.929 and the orthorhombic lattice form, pulcherite, is pale yellow.
The property of bismuth vanadate of not generating free radicals can be demonstrated by the ethylene test described in the article “Ethylene formation from methionine as a method to evaluate oxygen free radical scavenging and metal inactivation by cosmetics” by J.-B. Galey, F. Millecamps and Q.-L. Nguyen, International Journal of Cosmetic Science, 13, 65-78, 1991.
An object of the invention is to compare the behavior of the inorganic pigment of the invention with the behavior of conventional pigments in a photo-oxidation test using iron as free-radical generator.
In the ethylene test measurement procedure, the FeCl
3
used to activate the production of free radicals was replaced with each of the pigments to be tested. The results are shown in the table below.
DYE
ETHYLENE PRODUCED (peak area)
Concentration
0.01%
0.1%
0.2%
Yellow iron oxide
13,500
30,000
50,000
(CI:77492)
Bismuth vanadate
5,000
5,500
5,000
The control of FeCl
3
at 0.005% is on average 9000 (arbitrary unit—relative measurement).
The greater the amount of ethylene, the greater the production of free radicals.
Yellow iron oxide (CI:77492) is not inert. At low dose, it activates up to a certain concentration at which the protective effect of the pigment comes into play, whereas for bismuth vanadate, the degree of ethylene produced is very low and does not change as a function of the concentration. This pigment may thus be used advantageously in make-up compositions and colored antisun compositions intended in particular for protecting the skin and/or mucous membranes such as the lips, without generating free radicals and thus limiting the degradation of the skin and/or the mucous membranes.
Compared with the yellow iron oxides commonly used in cosmetics, the pigment of the invention also has the advantage of having a higher saturation of color, i.e., more vivid and of a more intense color, which makes it possible, in particular, to use in smaller amount of pigment, for an equivalent color yield.
The calorimetric parameters of bismuth vanadate sold by BASF under the trade name Sicopal Gelb L1100 relative to those of yellow iron oxide (CI:77492) are given below.
Parameter
Yellow iron oxide
Howard S.
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Page Thurman K.
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