Patent Application
20070259012
Except in operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts or ratios of material or conditions of reaction, physical properties of materials and/or use are to be understood as modified by the word “about.” All amounts are by weight of the final composition, unless otherwise specified.
The present invention is directed to substantially clear solid cosmetic compositions. “Clear” it is meant in the usual dictionary definition of this term. Thus, a clear stick, like glass, allows for ready viewing of objects behind it. By contrast, a translucent cosmetic stick, although allowing light to pass through, causes the light to be so scattered that it will be impossible to clearly identify objects behind the translucent stick. Opaque sticks do not permit the light to pass through. Thus, according to the present invention there is a distinction between, for example, “clear” and “translucent” cosmetic compositions.
By stable, it is meant that the structure of the solid composition is physically stable to have the desired stiffness to form a solid and the composition is chemically stable such that the oily components incorporated within the composition do not leak or migrate out of the composition.
More specifically, in the present invention, it has been surprisingly found that combining a specific wax with a solvent system such that the refractive index of the solvent system matches the refractive index of the wax results in a clear, stable composition having a refractive index of between 1.4-1.6.
The wax of the present invention is a polyolefin wax modified with silane compounds and prepared using metallocene catalysts. More specifically, the polyolefin wax is a partially crystalline polyolefin homopolymer or copolymer wax modified free-radically with a silane compound and having a viscosity as measured at 170° C. of between 10 and 50,000 mPas and a heat of fusion >10 J/g, wherein the silane compound used for modification includes at least one olefin double bond and at least one alkoxy radical attached directly to silicon and wherein the polyolefin waxes used for modification have been prepared using a metallocene catalyst. The polyolefin wax of the present invention and the process of making such are provided in further detail in U.S. Patent Application No. 2005-0043455, which is incorporated by reference herein.
The partially crystalline polyolefin homopolymer or copolymer wax of the present invention has a refractive index of between 1.4 to 1.6. The refractive index of a material may be measured by using a refractometer and by employing conventional refractory techniques. A particularly preferred refractometer used in the present invention is Fisher Scientific's Abbe Refractometer Model No. 6182 (available from Fisher Scientific of Springfield, N.J.).
The preferred polyolefin wax of the present invention is a polypropylene wax (Commercially available under the Tradename Licocene PP 1602 from Clariant). The polyolefin wax is present in an amount of from 0.1% to 20%, preferably from 1% to 10% and most preferably from 2% to 5%.
The second essential element of the present invention is a solvent system. It has been surprisingly found that a solvent system that has a refractive index that matches the refractive index of the wax of the present invention surprisingly creates a substantially clear solid anhydrous composition while maintaining stability. Specifically, the refractive index of the solvent system is between 1.4-1.6. Simply matching the refractive index of the solvent with the wax, however, does not yield a solid composition, as provided in more detail in Example 2 below. For example, a high concentration of hydrocarbons in a solvent system may dissolve the wax and therefore destroy the structure of the solid composition.
The solvent of the present invention may be selected from any solvent used in cosmetic compositions as long as the solvent does not change the refractive index of the solvent system, as indicated above. Specifically, the solvent of the present invention is selected from but not limited to Tridecyl Trimellitate (Hatcol 200), Isododecane (Permethyl 99A), Isohexadecane (Permethyl 101A), Isoeicosane (Permethyl 102A), Polyisobutene (Permethyl 104A, 106A, Presperse), Isodecyl Neopentanoate (Dermol 105), Lauryl Lactate (Dermol LL), Ethylhexyl Palmitate (Dermol 816), Octyldodecyl Behenate (Dermol 2022), Isododecyl Ethylhexanoate (Dermol 334), Polyglyceryl-2 Diisostearate (Dermol DGDIS), Synthetic Jojoba Oil (Wickenol 139), Octyldodecyl Myristate (Wickenol 142), Isononyl Isononanoate (Wickenol 151), Isodecyl Isononanoate (Wickenol 152), Isotridecyl Isononanoate (Wickenol 153), Octyl Stearate (Wickenol 156), Dioctyl Adipate (Wickenol 159), Dioctyl Adipate/Octyl Palmitate/Octyl Stearate (Wickenol 161), Octyl Stearate/Octyl Palmitate/Dioctyl Adipate (Wickenol 163), Hexyl Laurate (Cetiol A, Cognis), Coco-Caprylate/Caprate (Cetiol LC, Cognis), Cetearyl Isononanoate (Cetiol SN, Cognis), Isocetyl Stearate (Cetiol G-16S, Cognis), Isopropyl Myristate (Liponate IPM), Isopropyl Palmitate( Liponate IPP), Propylene Glycol Dipelargonate, Cetyl Octanoate (Trivent OC-16), Tricaprylin (Trivent OC-G), Octyldodecyl Myristate (Bemel Ester NPDC), Isostearyl Neopentanoate (Ceraphyl 375/Dermol 185), Decyl Oleate (Ceraphyl 140), Isodecyl Oleate (Ceraphyl 140A), Octyldodecyl Stearoyl Stearate (Ceraphyl 847), Caprylic/Capric Triglyceride (Lexol GT-865, Liponate GC-K, Myritol 318), Hydroxy-terminated Polyurethane (Polyolprepolymer-14), Natural Squalane, Isostearyl Neopentanoate (Bernel Ester 2014), Octyldodecanol (Eutanol G), Oleyl Lactate (Pelemol OL), Oleyl Alcohol (Novol), Oleyl Oleate (Schercemol OLO), Glycereth-7 Triacetate (Pelemol G7A), Polyglyceryl-3 Diisostearate (Synton PAO 100), Pentaerythrityl Tetraisostearate (Crodamol PTIS), Triglycerine Diisostearate (Emerest 2452), Oleyl Lactate (Plurol Diisostearique), Diglycerol Diisostearate/IPDI Copolymer (Polyderm PPI-DGDIS), Ricinus Communis (Castor) Seed Oil (Castor Oil USP/Crystal O), Menthyl Anthranilate (Neo Heliopan MA), Ethylhexyl Salicylate (Neo Heliopan OS), Polyisobutylene (Indopol H-1900), 2-Ethylhexyl-4-methoxycinnamate (Parsol MCX/Escolol 557) and combinations thereof.
The solvents of the present invention may each be used alone or in any combination in the solvent system as long as the total in the composition is between 1% to 90%, preferably from 10% to 80% and most preferably from 30% to 50% by weight of the total composition.
The present invention optionally comprises a gellant. The gellant of the present invention is selected from traditional gellants that do not destroy the refractive index of the composition of the present invention. Specifically, the gellant is selected from but not limited to Dibutyl/Laurol Glutamide (G.P.-1), Steroyl Inulin (Rheopearl Series) (available from Tomen America Inc.), Ethyl Hexyl Hydrostearate/Triethylhexyl Trimellitate/C30-45 Olefin (Clearwax (LCW)), 12-Hydroxystearic Acid (Phoenix Chemical), Polyethylene at low concentrations below 1% (Newphase, Presperse, Alzo Int'l, Mineral and Pigment Solutions, Inc.), Ethylenediamine/Stearyl Dimmer Tallate Copolymer (Uniclear 100VG, Arizona Chemicals) Polyamide resin (Macromelt6212, Versamid 940, GAX 14-030, GAX 14-029 (all available from Cognis)), Hydrogenated Styrene/Isoprene Copolymer (Kraton G-1701), Styrene-Ethylene/Butylene-Styrene Black Copolymer (Kraton G-1650, Kraton G-1652, Kraton G-1702 (Lipo Chemicals)), and combinations thereof.
The gellant is used in an amount of from 0.1% to 50%, preferably from 5% to 15%, and most preferably from 6% to 10% by weight of the composition.
Optional ingredients may be included within the composition of the present invention as long as the physical integrity of the anhydrous solid composition is not compromised and the refractive index of the composition remains between 1.4-1.6.
Pigments are selected from fluorescent, pearlescent and glitter materials. Although the refractive index may not be match the refractive index of the wax or solvent system of the present invention, the pigments of the present invention do not detract from the refractive index of the composition.
Pigments of the present invention are used in an amount of from 0.01 to 10%, preferably from 0.1% to 5%, and most preferably from 0.1% to 1%.
Preferred fragrances are the essential oils. Dermatological agents that may be used in our compositions include vitamins, anti-inflammatory agents, hydroxyacids, and the like, and mixtures thereof. Sunscreens that may be used include dioxybenzone, 2-ethylhexyl 2-cyano-3, 3-diphenylacrylate, 2-ethylhexyl p-methoxycinnamate, 2-ethylhyxyl salicylate, homosalate, menthyl anthranilate, oxybenzone, octyl dimethyl PABA, red petrolatum, titanium dioxide, ferulic acid esters, or mixtures thereof. Preferably the sunscreen is titanium dioxide, ferulic acid esters or mixtures thereof.
The solvent used in compositions of this invention may also comprise other ingredients that are commonly employed by one of skill in the art in compositions for application to the skin (e.g., stabilizers, emollients, microbial agents, antioxidants and the like).
Other biological active agents can be added to the present inventive compositions as desired, as long as the clarity and refractive index are not compromised. Routine experimentation can determine the amounts required to retain a stable composition. The type of biological active agent added, can be any which is beneficially used in a topical cosmetic or pharmaceutical composition. For example, the composition can further comprise moisturizing actives, antibacterials, anti-irritant agents, anti-inflammatory agents, antiaging agents, antiwrinkle agents, sunscreen agents, or vitamins.
The preferred composition is in the form of an anhydrous solid stick composition. This composition is made using a conventional lipstick mold known to those skilled in the art. Specifically, the lipstick is made by first mixing the partially crystalline polyolefin homopolymer or copolymer wax within the solvent system. Any conventional mixing methods may be employed. The composition is then allowed to cool to ambient temperature.
The present inventive compositions are particularly useful as lipsticks. The composition is administered or topically applied to the lips. It is suggested as an example that topical application range from about once per day to about twice daily. The amount of composition applied to the skin will vary depending upon coverage desired.
The following examples further illustrate the invention, but the invention is not limited thereto.
The following composition provides an example of a preferred embodiment incorporating the inventive composition in the form of an anhydrous stick. Additional gellants and emollients may be incorporated, as shown in the composition in Table 1. The examples that follow are conducted utilizing the composition below.
The following example provides the results of a comparison of four gelatinization agents in combination with eleven solvents, the results of which are provided in Table 2 below. Each composition tested comprises 50% solvent and 50% wax/gelatinization agent.
The physical and chemical stability of the anhydrous solid composition are determined visually. Specifically, the resulting solid is considered to be stable if it has the desired stiffness, as described hereinabove. As a review, the desired stiffness is defined as a solid which does not readily break or crumble and yet is solid enough to retain the oily components of the composition. Clarity is also determined visually.
As seen from Table 2 above, the combination of HATCOL 200+ with Licocene PP 1602 yields a clear, stable composition. The other combinations of wax/solvent combinations either fail in producing a clear composition, a stable composition, or both.
This application claims priority from U.S. 60/746270, filed May 3, 2006.
| Number | Date | Country | |
|---|---|---|---|
| 60746270 | May 2006 | US |
