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  Cosmetic emulsions containing uncoated silicone elastomers and non silicone treated pigmentsUSPTO Application #: 20070248550Title: Cosmetic emulsions containing uncoated silicone elastomers and non silicone treated pigments Abstract: Disclosed are cosmetic compositions in the form of an emulsion that contain an uncoated silicone elastomer, a solvent for the elastomer, a non-silicone treated pigment and an emulsifier, methods of making the compositions, and methods of applying the compositions to a keratinous substrate or tissue. (end of abstract)
Agent: Lerner, David, Littenberg, Krumholz & Mentlik - Westfield, NJ, US Inventors: Dhaval Patel, Gisela Perruna USPTO Applicaton #: 20070248550 - Class: 424059000 (USPTO) Related Patent Categories: Drug, Bio-affecting And Body Treating Compositions, Topical Sun Or Radiation Screening, Or Tanning Preparations The Patent Description & Claims data below is from USPTO Patent Application 20070248550. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] Cosmetic products, and particularly pigmented cosmetic products such as foundations, are developed with the aims of matching skin tone and providing uniform coverage on the skin. Some products tend to streak upon application, fail to blend with natural skin tone, or change color during application. Other products become unstable and separate during storage, and thus require mixing before application. SUMMARY OF THE INVENTION [0002] A first aspect of the present invention is directed to a cosmetic composition in the form of an emulsion that contains an uncoated silicone elastomer, a solvent for the elastomer, a non-silicone treated pigment, and an emulsifier. Methods of preparing the compositions are also provided. [0003] Another aspect of the present invention is directed to a method for applying colored make-up to a keratinous substrate, comprising applying to the substrate a cosmetic composition in the form of an emulsion that contains an uncoated silicone elastomer, a solvent for the elastomer, a non-silicone treated pigment and an emulsifier. [0004] Applicants have discovered that inventive compositions containing an uncoated silicone elastomer were stable over a much longer period of time as compared to compositions containing a coated silicone elastomer commonly used in the cosmetics industry. [0005] Applicants have also discovered that the bulk tone of the compositions (i.e., the skin tone of the inventive compositions in the container) is substantially identical to the skin tone (i.e., the color shade of the compositions once applied to skin). Without intending to be bound by theory, and contrary to what persons skilled in the art would have expected, Applicants believe that non-silicone treated pigments tend not to re-agglomerate during storage. DETAILED DESCRIPTION [0006] Silicone elastomers useful in the cosmetics industry may be coated, typically with a hard resin or micro-fine particles. Examples of coated elastomers include KSP-100, KSP-200 and KSP-300 (Shin-Etsu Silicones of America, Inc., Akron, Ohio), which are coated with a hard silicone resin, and DC9701 (Dow Corning Corp., Midland, Mich.) which is coated with micro-fine silica particles. The compositions of the present invention, however, require the presence of uncoated silicone elastomers. Applicants have discovered that uncoated silicone elastomers, even those which are considered "non-emulsifying", will form, at least in the context of the invention, a stable emulsion. [0007] The cosmetic compositions of the present invention are emulsions, and thus contain at least two phases, namely a continuous phase and a dispersed phase. The first phase, which may be either the continuous or the dispersed phase, contains the uncoated silicone elastomer (which is hydrophobic in nature). The second phase, which can be hydrophilic or hydrophobic, is discrete from the first phase. This phase may be aqueous in nature, such that the emulsion would be an oil-in-water or water-in-oil emulsion. Alternatively, the second phase may contain immiscible oil, thus producing an oil-in-oil emulsion. [0008] Broadly, uncoated forms of cosmetically acceptable silicone elastomers are suitable for use in the present invention. These elastomers are considered non-emulsifying e.g., they do not contain any appreciable amount of polyoxyalkylenes. In some embodiments, the uncoated silicone elastomer is a cross-linked reaction product of a polysiloxane with, for example, an alpha,omega-diene. See U.S. Pat. No. 5,654,362, incorporated herein by reference (specifically column 2, lines 2-16; 22-67 and column 6, lines 15-40 thereof), and U.S. Pat. No. 6,793,915. These uncoated silicone elastomers include cross-linked or partially cross-linked cyclomethicone (and) dimethicone crosspolymers. These elastomers may be prepared by a crosslinking reaction between (a) --Si--H containing polysiloxanes and (b) an alpha,omega-diene in the presence of a platinum catalyst and (c) a low molecular weight linear or cyclic polysiloxane. The elastomer can be swollen with the low molecular weight polysiloxane under a shear force. The .ident.Si--H containing polysiloxane of part (a) is represented by compounds of formula (R.sup.1).sub.3SiO(R.sup.2.sub.2SiO).sub.a(R.sup.3HSiO).sub.bSi(R.sup.1).- sub.3, designated herein as type A.sup.1, and compounds of the formula H(R.sup.1).sub.2SiO(R.sup.2.sub.2SiO).sub.cSi(R.sup.1).sub.2H or formula H(R.sup.1).sub.2SiO.sub.2SiO(R.sup.2.sub.2SiO).sub.a(R.sup.3HSiO).sub.bSi- (R.sup.1).sub.2H, designated herein as type A.sup.2. In these formulas, R.sup.1, R.sup.2, and R.sup.3 are alkyl groups with 1-6 carbon atoms, a is 0-250, b is 1-250, and c is 0-250. The molar ratio of compounds A.sup.1:A.sup.2 is 0-20, preferably 0-5. The alpha,omega-diene in part (b) is a compound of the formula CH.sub.2.dbd.CH(CH.sub.2).sub.xCH.dbd.CH.sub.2 where x is 1-20. Representative examples of suitable alpha,omega-dienes include 1,4-pentadiene, 1,5-hexadiene, 1,6-heptadiene, 1,7-octadiene, 1,8-nonadiene, 1,9-decadiene, 1,11-dodecadiene, 1,13-tetradecadiene, and 1,19-eicosadiene. More specific examples of these uncoated silicone elastomers include DC-9040, DC-9041 and DC-9045. See U.S. Pat. No. 6,793,915, column 5, lines 9-34. [0009] Dimethicone/vinyldimethicone crosspolymer compositions (that are cross-linked or partially cross-linked) (e.g., KSG-15 and USG-103, commercially available from Shin-Etsu Silicones of America), and cross-linked or partially cross-linked vinyldimethicone/methicone crosspolymer in cyclomethicone (e.g., GE 1229 from General Electric Silicones (Waterford, N.Y.)) may also be useful. See U.S. Pat. No. 6,793,915, column 5, lines 5-8 and 35-47. The suitability of other uncoated silicone elastomers for use in the present invention may be evaluated in accordance with standard techniques, such as described in the working examples. [0010] Commercially available uncoated silicone elastomers such as DC-9040, DC-9041, DC-9045, KSG-15 and USG-103 are already present in the form of a gel, wherein the elastomer is formulated in a solvent such as cyclomethicone, dimethicone or another silicone oil. Thus, if the present compositions are formulated by adding the elastomer in powder form, they also require addition of a solvent for the elastomer. Volatile and non-volatile silicone oils are useful for this purpose. Suitable volatile silicone oils include linear or cyclic silicones containing from 2 to 7 silicon atoms, optionally containing alkyl or alkoxy groups containing from 1 to 10 carbon atoms e.g., cyclopentasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, hexadecamethylcyclohexasiloxane, heptamethylhexyltrisiloxane and heptamethyloctyltrisiloxane, and mixtures thereof. [0011] Examples of suitable non-volatile silicone oils include linear polydimethylsiloxanes (PDMSs) that are liquid at room temperature; polydimethylsiloxanes that may be substituted with fluoro groups, functional groups such as hydroxyl, thiol or amine groups, aliphatic (e.g., alkyl) groups or aromatic (e.g., phenyl) groups, which are pendent and/or at the end of a silicone chain, these groups each containing from 2 to 24 carbon atoms; phenylsilicones, for instance phenyltrimethicones, phenyldimethicones, trimethyl pentaphenyl trisiloxane (e.g., DC555 from Dow Corning), tetramethyl tetraphenyltrisiloxane, phenyl trimethylsiloxydiphenylsiloxanes, diphenyl dimethicones, diphenyl methyldiphenyl trisiloxanes and 2-phenylethyl trimethylsiloxysilicates. Other examples of silicone oils include polysiloxanes modified with fatty acids, fatty alcohols or polyoxyalkylenes, fluorosilicates and perfluoro oils. [0012] The uncoated silicone elastomer is present in an amount that generally ranges from about 0.1% to about 35%, and in some embodiments, from about 0.1% to about 25%, and yet other embodiments from about 0.1% to about 15%, wherein all percentages are based on the dry weight of the elastomer (i.e., in powder form) relative to the total weight of the cosmetic composition. In some other embodiments, the amount of uncoated silicone elastomer is about 5.6% of the total weight of the composition. Relatively high amounts of the elastomer may be present. In some embodiments, coated silicone elastomers may be present, e.g., in amounts up to 50% based on total weight of the composition, provided that the stability of the emulsion is not compromised. [0013] Pigments suitable for use in the present invention are treated e.g., coated or surrounded, with a non-silicone compound. By "silicone compound" it is meant any compound that contains silicone e.g., silicones, silanes and siloxanes. The treated pigment is more hydrophobic than the untreated pigments. Amino acid-treated pigments are useful in the practice of the present invention. Examples of amino acids include N-acylamino acid salts of glycine, alanine, valine, leucine, isoleucine, phenylalanine, proline, threonine, serine, arginine, histidine, lysine, aspartic acid and glutamic acid, and salts thereof. Specific examples include N-acyl-N-methylglycine, N-acyl-N-methyl-.beta.-alanine and N-acyl-L-glutamine acid and in some embodiments, the Al, Mg, Ca, Zn, Zr and Ti salts thereof. The acyl group may include a residue of capric acid, lauric acid, myristic acid, palmitic acid, stearic acid or oleic acid. See U.S. Pat. No. 4,606,914, incorporated herein by reference (specifically, column 3, lines 1-31 thereof), and U.S. Pat. No. 6,296,860. Methods of treating pigments with amino acids are also disclosed in the '914 patent. Treated pigments may further include pigments treated with a vegetable-derived amino acid such as titanium dioxide coated with disodium stearoyl glutamate and aluminum hydroxide (e.g., NAI, commercially available from U.S. Cosmetics Corp., a distributor of Miyoshi Kasei (Japan)). [0014] Additional examples of treated pigments suitable for use in the present invention include pigments treated with perfluoro compounds (cosmetically acceptable organic fluoro compounds) such as C.sub.9-C.sub.15 (i.e., C9, C10, C11, C12, C13, C14 and C15) fluoroalcohol phosphates. [0015] Further examples of treated pigments suitable for use in the present invention include titanate-treated pigments. Examples of these pigments include coordinate titanates and monoalkoxy titanates such as monoalkoxy triacyl titanates (also referred to as monoalkyl titanates). See, U.S. Patent Application Publication No. 20050019284 (specifically paragraphs [0038]-[0052]). Specific examples of titanates include isopropyl triisostearoyl titanate (ITT, available from KOBO, South Plainfield, N.J.), isopropyl dimethacryl isostearoyl titanate, and isopropyl dimethacryl isostearoyl titanate. [0016] Further examples of treated pigments that may be useful in the present invention are described in U.S. Pat. No. 5,167,709 (pigments treated with a polyvalent salt of an amidosulfonic acid) and U.S. Pat. No. 5,928,658 (pigments treated with water-soluble metal salts of fatty acids, hydrogenated lecithin or acyl collagen). The suitability of other treated pigments for use in the present invention may be evaluated in accordance with standard techniques, such as described in the working examples. [0017] A plurality of treated pigments of different color (or shades of color) may be present in the composition in order to achieve the desired color or tone. [0018] The pigments that may be treated include white pigments, colored pigments, inorganic pigments, pigments having a micron size and pigments not having a micron size. Among the inorganic pigments that may be useful are titanium dioxide, iron oxide, zirconium oxide, zinc oxide, cerium oxide, chromium oxide, manganese violet, ultramarine blue, chromium hydrate, and ferric blue. [0019] Broadly, the amount of pigment may vary widely, provided that it does not interfere with the formation or stability of the emulsion, and provides the desired coverage, tone and color when applied to the skin--determinations which are within the level of skill in the art. The amount of the treated pigment generally ranges from about 0% to about 70%, and in some embodiments from about 0% to about 35%, and in some other embodiments from about 0% to about 20%, based on the total weight of the cosmetic composition. In some other embodiments, the amount of the treated pigment is about 10% of the total weight of the composition. As used herein, the term "about 0%" when referring to an ingredient that is stated to be present in an embodiment of the invention, means a finite amount greater than zero. [0020] Emulsifiers typically employed in the compositions of the present invention include anionic, nonionic and cationic emulsifiers. See, e.g., Encyclopedia of Chemical Technology, KIRK-OTHMER, volume 22, pp. 333-432, 3rd edition, 1979, Wiley, for the definition of the properties and (emulsifying) functions of the emulsifiers, in particular pp. 347-377 of this publication regarding anionic and nonionic emulsifiers. Examples of nonionic emulsifiers useful in the compositions of the invention include fatty acids, fatty alcohols, polyethoxylated fatty alcohols or polyglycerolated fatty alcohols, such as polyethoxylated stearyl alcohols or cetylstearyl alcohols, esters of fatty acid and sucrose, and glucose alkyl esters, in particular polyoxyethylenated C.sub.1-C.sub.6 alkyl glucose fatty esters, and ethoxylated compounds such as Polysorbate-20, Laureth-7, Laureth-4 and Sepigel.RTM. 305. Examples of anionic emulsifiers include C.sub.16-C.sub.30 fatty acids neutralized by amines, ammonia or the alkali metal salts thereof. Examples of cationic emulsifiers include quaternary amines, amine oxides and amines, e.g., alkyl amines, alkyl imidazolines, ethoxylated amines, quaternary compounds, and quaternized esters. Cationic emulsifiers may also provide a conditioning effect. [0021] Organosilicone emulsifiers are particularly useful, particularly in embodiments wherein the emulsion is a water-in-oil (silicone) emulsion. Such emulsifiers include silicone polyethers and polyalkoxylated silicone elastomers. Continue reading... Full patent description for Cosmetic emulsions containing uncoated silicone elastomers and non silicone treated pigments Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Cosmetic emulsions containing uncoated silicone elastomers and non silicone treated pigments patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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