COSMETIC STICKS

Abstract: Solid stick compositions comprising a long-chain fatty alcohol having from about 8 to about 18 carbon atoms in the chain, volatile silicone and C₂₀ or longer chain alcohols at levels of from about 1% to about 3% of the total long-chain fatty alcohol present in the compositions. These solid sticks have improved strength and hardness without undue brittle­ ness.

Description: (EIC STICKS The present invention relates to solid stick compositions, particularly solid antiperspirant Sticks, having satisfactory strength and hardness whi le exhibiting aesthetically-pleasing attributes. Many solid stick coqpositions are available in the art. Typically, these solid sticks are available in two basic forms. One such form is composed of soap/alcohol gel sticks, which may have stability problems. For instance, the combination of soap/alcohol gels with conventional astringent antiperspirant salts, such as aluminium chlorobydrate, can result in unstable gel structures rendering such sticks less aesthetically-pleasing to consumers. In order to alleviate sane of these problems, waxy materials, some in combination with volatile fluids, have been used in the development of solid stick compositions. US-A-4,126,679, November 21, 1978 to Davy and Drolet; US-A-4,229,432, October 21, 1980 to C,eria; US-A-4,265,878, May 5, 1981 to Keil: US-A-4,280,994, July 28, 1981 to Turney disclose such compositions. The most commonly used waxy material in sticks of this type include long-chain fatty alcohols. Sone use such alcohols in combination with volatile silicones. Although these fatty alcccol/volatile silicone solid sticks avoid some of the soap gel problems, they may vary unacceptably in structural hardness and strength. Therefore, formulations are sought which provide strong fatty aloiol/volatile silicone-based sticks without causing those sticks to become too brittle and cosmetically unacceptable. Surprisingly, the addition of fatty alcohols, C20 and longer, produces such a product. That is, not only is the strength of such a stick increased, but that strength enhancement d does not result in overly hard, brittle product. It is an object, therefore, of the present invention to pro- vide solid stick compositions containing long-chain higher fatty alcohols and a volatile silicone wherein such compositions contain sufficient C20 alcohol and longer chain alcohols to result in a stable and strong final product. It is a further object of the present invention to not only provide strong final products but to provide aesthetically-pleasing products as well. Another object of this invention is to provide solid stick compositions as described above which additionally contain astringent antiperspirant salt materials. These and other objectives will become more apparent from the following disclosure. All percentages and ratios herein are by weight unless otherwise designated. SUMMARY OF THE INVENTION The solid stick compositions of the present invention are comprised of from about 58 to about 20% of a long-chain fatty alcohol and from about 358 to about 55% volatile silicone, wherein said compositions also contain an alcohol selected from the group consisting of C20 alcohol, alcohols whose chains are longer than C20 and mixtures thereof at levels of from about 1% to about 3% of the total long chain fatty alcohols present in said compositions. DETAILED DESCRIPTION OF THE INVENTION The present solid stick compositions contain certain essential and may in addition contain other nonessential, optional components. Each component is discussed in detail below. LONG-CHAIN HIGHER FATTY ALCOHOL The higher fatty alcohols of the present invention are those having melting points of from about 1000F. to about 1500F. These include fatty alcohols containing from about 8 to about 18 carbon atoms in their chain, preferably from about 12 to about 18 carbon atoms. Examples suitable for use in the invention at hand include cetyl alcohol, stearyl alcohol, myristyl alcohol, lauryl alcohol, and mixtures thereof. From about 5% to about 20% higher fatty alcohol is present in the solid stick compositions, preferably from about 10% to ab6ut 15%. As indicated above, the compositions described herein also contain from about 1% to about 3%, based on the total weight of the long chain fatty alcohols present (the C12 C C18 alcohols as well as the longer chain alcohols), of alcohols having chain lengths of C20 or longer. A preferred alcohol of this type is commercially available C20 alcohol which is a mixture of higher fatty alcohols wherein about 50% is C20, about 30% is C22, with the remainder primarily composed of alcohol chains longer than C22. The alcohols useful in the present invention may go up to C26 but it is preferred to have the majority in the C20 - C22 range. The level of C20 and longer chain alcohols found in the commercially available shorter long-chain fatty alcohols (e.g. stearyl alcohol) generally does not exceed about 0.8%. Oniy by increasing the level of these alcohols to from about 1% to about 3%, preferably from about 1% to 2%, of the total higher fatty alcohol content will a stronger product result. VOLATILE SILICONE The volatile silicones useful in the solid stick compositions of the present invention may be either cyclic or linear with the polydimethylsiloxanes containing from about 3 to about 9, prefer 'ably from about 4 to about 5, silicon atoms, being preferred. The following formula illustrates the cyclic volatile poly dimethylsiloxanes useful in the solid stick compositions disclosed herein: EMI3.1 wherein n = 3 to 7. The linear polydimethylsiloxanes contain from about 3 to about 9 silicon atoms per molecule and have the following general formula: 3)3Si O-(Si(CH3)2-O)n - Si(CH3)3 wherein n = 1 to 7. Examples of silicones of the above type include those offered by Dow Corning Corporation, Dow Corning 344, 345 and 200 fluids, Union Carbide, Silicone 7207 and Silicone 7158, and Stauffer Chemical, SWS-03314. The linear volatile materials generally have viscosities of less than about 5 centistokes at 250C. while the cyclic materials have viscosities less than about 10 centistokes. "Volatile" means that the material has a measurable vapor pressure. A description of volatile silicones is found in Todd and Byers, "Volatile Silicone Fluids for Cosmetics", Cosmetics and Toiletries, Vol. 91, January, 1976, pp. 27 - 32, incorporated herein by reference. The amount of volatile silicone used in the present compositions is from about 35 to about 55, preferably from aMput 40 to about 50%. OPTIONAL COMPONENTS The solid stick compositions of the present invention nay contain a variety of optional, nonessential components. These components serve a variety of functions such as improving the stability, cosmetics and/or aesthetics of the present compositions. WAX A preferred optional component includes a wax such as castor wax, fatty acids, silicone waxes and glycerol monostearate, and mixtures thereof at levels of from about 1% to about 10%, preferably from about 3% to about 10%. If present, the vrax is believed to enhance structural stability at higher temperatures. EMOLLIENT The emollient component of the present invention is useful in providing an aestheticaily-pieasing product. One type of emollient suitable for use in the present solid stick compositions is an ethylene oxide andlor propylene oxide condensation product having the following formula: RO(C2H40) a IC,H O)b H wherein R is either hydrogen or a hydrocarbon chain having from about 2 to 20 carbon atoms, preferably from about 4 to about 18, a and b are each from about 0 to about 35, and a+b is from about 5 to about 35. Examples of such emollients include Fluid A (a condensate of about 14 moles of propylene oxide with about 1 mole of butyl alcohol sold by Union Carbide); a polypropylene glycol having molecular weight of about 1200; a polyethylene glycol having molecular weight of about 420; a condensate of 20 moles ethylene oxide and 5 moles propylene oxide with one mole of cetyl alcohol, and mixtures thereof. Other emollients suitable for use in the present solid stick compositions include fatty acid and fatty alcohol esters and water insoluble ethers such as those disclosed in U.S. Patent 4,202,879, May 13, 1980 to Shelton, incorporated herein by reference and mixtures thereof. If present, the emollient is used at levels of from about 2% to about 10%, preferably from about 3% to about 7%. ASTRINGENT ANTIPERSPIRANT Any aluminum astringent antiperspirant salt or aluminun and/or zirconium complex can be employed herein when the present sticks are intended for use as an antiperspirant. Useful are such salts as aluminum halides, aluminum hydroxyhalides, zirconyl oxyhalides, zirconyl hydroxyhalides, and mixtures thereof. The aluminum salts of this type include aluminum chloride and aluminum hydroxyhalide having the following formula: At2 (OH )aCIb X H2O a is from about 2 to about 5; a+b = 6 and a and b need not be integers; and x is from about 1 to about 6. The manner of preparing such salts is disclosed in U.S. Patent 3,887,692, June 3, 1975 to Gilnan, incorporated herein by reference. Zirconium salts are also useful in the present invention. Such salts include zirconium oxychloride, zirconium hydroxychloride, and zirconium salts of the formula, ZrO(OH)2 aCla nH2O, wherein a is from about 1.5 to about 1.87 and n is from about 1 to about 7. These types of zirconium salts are discussed in Belgium Patent 825,146, August 4, 1975 to The Procter s Gamble Company, incorporated herein by reference. Conplexes of the previously-discussed astringent salts are disclosed in U.S. Patent 3,679,068, February 12, 1974 to Luedders, et al, incorporated herein by reference. The Leudders et al patent discloses complexes of aluminum, zirconium. and glycine commonly known as ZAG complexes. The preferred aluminum salt for use in such ZAG complexes is aluminum. chlorhvdroxide with the preferred zirconium compounds being zirconyl hydroxychloride and other zirconyl hydroxyhalides of the following formula: ZrO (OH ) 2-aCla nH2O wherein a is from about 1.5 to about 1.87 and n is from about 1 to about 7. U.S. Patent 4,120,948, October 17, 1978 to Shelton discusses these preferred ZAG compounds and is incorporated herein by reference. Other antiperspirant complexes are also suitable for use in the present compositions. For example, U.S. Patent 3,9C3,258, September 2, 1975 to Siegel, discloses a zirconyl chloride aluminum hydroxide and aluminum chlorhydroxide complex. U.S. Patent 3,979,510, September 6, 1976. to Rubino discloses complexes composed of particular aluminum, zirconium and alumir.um buffer compounds. Additionally, U.S. Patent 3,981,986, September 21, 1976 to Rubino, discloses the aluminum and zirconium conplexes with an organic buffer, and U.S. Patent 3,970,748, July 20, 1976 to Mecca, discloses an aluminum chlorhydroxy glycinate complex. All of these patents are incorporated herein by reference. The levels of these antiperspirant materials range from about 10 & to about 70%, preferably from about 15% to about 50%, most preferably from about 15% to about 25% on a pure antiperspirant salt basis. In the case of ZAG type materials glycine is excluded when antiperspirant salt level is determined. OTHERS Another optional component of the present invention is inert filler material. This filler material enhances the aesthetic characteristics of the present solid sticks and may serve to stabilize the structure of such sticks. Among the filler materials suitable for use in the present invention are talc, colloidal silica such as CAE3-O-Sil(Cabot. Corp.), clays. such as bentonite, and mixtures thereof. The inert filler material comprises from about 0.5% to about 10% of the present solid stick compositions. Conventional deodorant materials also may be included in the present invention. Suitable deodorants include bacteriostatt quaternary ammonium compounds such as cetyl-trimethylammonium bromide, cetyl pyridinium chloride, benzethonium chloride, diisobutyl phenoxy ethoxy ethyl dimethyl benzyl ammonium chloride, sodium N-lauryl sarcosine, sodium N-palmethyl sarcosine, lauroyl sarcosine, N-myristoyl glycine, potassium N-lauryl sarcosine, stearyl, trimethyl ammonium chloride and mixtures thereof. Another suitable deodorant material is 2,4,4'-trichloro2'-hydroxydiphenyl ether. If present, these deodorants comprise from about 0.1% to about 1.0% of the composition. Other optional components include perfumes, pigments, dyes, coloring agents, and the like, at levels individually of from about 0.1% to about 2.0%. METHOD OF MANUFACTURE The solid stick compositions of the present invention are made in accordance with well-established methods known to those knowledgeable in the art. INDUSTRIAL APPLICATION The present solid stick compositions are useful as vehicles for a wide variety of cosmetic materials. For instance, a preferred use of these solid stick compositions is as antiperspirant sticks. However, these sticks can be used as deodorant sticks as well as other cosmetic vehicles. The following example is presented as an illustration of the present invention and is not limitative thereof. EXAMPLE I An antiperspirant stick was made utilizing the following components: Component Weight % Cyclomethicone 43.95 Fluid AP 4.99 Stearyl Alcohol 11.49 Castor Wax 4.99 Talc ¯ 6.99 Zirconium/Aluminum/Glycine complex 26.67 Fragrance Masking Agent 0.80 C20OH* 0.12 *This is the commercial C20 alcohol mixture described previously. EXAMPLE II An antiperspirant stick similar to that described in Example I was prepared but the C20 and longer chain alcohol level was only 0.034%. This stick therefore did not have the required amount of such long chain alcohols. EXAMPLE Ill The sticks of Examples I and II were compared for softness and break strength. The softness measurements were made using a penetrometer while the break strength measurements were made using a Chatillon break strength tester. The results of these tests are shown below. Penetration Break Strength (Tenths (Pounds of a - Force)** mm)* Example I Product 78.1 11.3 Example 11 Product 96.1 7.1 * The penetration values are determined by using ASTM Method D-5. The measurements are made at least 10 mm from the edge of a stick. ** The breakstrength is determined using a Hunter Force Gauge, Model L-10, 0 - 30 ib. range. The gauge is attached to a slide which allows the gauge to contact the test stick through a breaker bar at a speed of three inches per minute. The value recorded is the force gauge reading when the stick breaks. It is seen that the product of the present invention has a greater break strength while also having a lower penetration value. WHAT IS CLAIMED IS:

Claims: CLAIMS 1. A solid stick canposition possessing improved strength without undue brittleness characterized by: (a) fram 5% to 20% of a lo-chain fatty alcohol having from 8 to 18 carbon atoms in its chain; and (b) from 35% to 55% volatile silicone; wherein said composition additionally contains an alcohol selected from C20 alcohol, alcohols whose chains are longer than C20 and mixtures thereof at a level of from 1% to 3% of the total fatty alcohol level. 2. A solid stick ooqposition according to Claim 1 characterized in that it additionally contains from 1% to 10% of a wax selected from castor wax, fatty acids, silicone waxes, glycerol monostearate, and mixtures thereof. 3. A solid stick composition according to Claim 1 or 2 characterized in that said long-chain fatty alcohol is present at a level of from 10% to 158 and is selected from cetyl alcohol, stearyl alcohol, myristyl alcohol, lauryl alcohol, and mixtures thereof. 4. A solid stick composition according to any of Claims 1 to 3 characterized in that said volatile silicone is selected from cyclic and linear polydimethylsiloxanes having from 3 to 9 silicon atoms in their chain. 5. A solid stick composition according to any of Claims 1 to 4 characterized in that it additionally contains fram 18 to 10% of an emollient. 6. A solid stick composition according to Claim 5 characterized in that said emollient is selected from ethylene oxide and/or propylene oxide condensation products, fatty acid esters, fatty alcohol esters, water insoluble ethers, and mixtures thereof. 7. A solid stick composition according to any of Claims 1 to 6 which additionally contains from 10% to 70% of an astringent antiperspirant salt. 8. A solid stick cccposition according to Claim 7 characterized in that said astringent antiperspirant salt is a complex of aluminium chlorhydroxide, a zirconium compound and glycine. 9. A solid stick composition according to any of Claims 1 to 8 characterized in that said C20 and/or longer chain alcohols are present at fran 1% to 2% of the total long-chain higher fatty alcohol.

Inventors: MAY, WILLIAM GEORGE
Applicants: THE PROCTER & GAMBLE COMPANY
Application year: 1984
Main classification: A61K7
IPC codes: A61K8, A61Q15