Antiperspirant creams and manufacture thereof

Abstract: Antiperspirant cream compositions, comprising: (a) from about 5% to about 60% of a volatile silicone oil; (b) from about 5% to about 60% of a non-volatile liquid C₁₂-C₂₅ saturated or unsaturated hydrocarbon emollient; (c) from about 2% to about 10% of a particulate thickening material; and (d) from about 15% to about 45% of a particulate antipers­ pirant active material, wherein the compositions have penetration force values of from about 150 grams to about 800 grams at 25°C and at 50% relative humidity. These compositions preferably contain a cosmetic powder material, at a level of from about 0.5% to about 20%. This invention also provides methods for making these compositions.

Description: The present invention relates to cosmetic cream compositions containing an antiperspirant active material. In particular, it relates to antiperspirant creams, and methods for making such compositions, with improved stability, efficacy, cosmetic and wash-off characteristics. Compositions designed to stop or reduce the flow of perspiration are well known in the cosmetic and chemical literature. Antiperspirants typically contain an astringent material, such as an astringent aluminum or zirconium salt. These compositions are designed to deliver the active to the skin in an effective form, while being cosmetically acceptable. A variety of methods have been used to apply antiperspirant compositions to the skin. For example, sprays, roll-ons, creams and stick compositions are commonly used. Such formulations are described in S. Plechner, "Antiperspirants and Deodorants" Cosmetics, Science and Technology 373-416 (M. Balsam and E. Sagarin, editors, 1972). Cream emulsions are also described, for example. in US-A-4,268,499, Keil, issued May 19, 1981, EP-A-0,028,853, Beckmeyer et al., published May 20, 1981 and AU-A-8,430,026, published January 3, 1985. Anhydrous creams, in gel form, are described, for example, in US-A-4,083,956, Shelton, issued April 11, 1978, and EP-A-135,315, Kasat, published March 27, 1985. EP-A-0,028,053 relates to liquid or aerosol antiperspirant compositions comprising a particulate antiperspirant material, a bulking or suspending agent, a volatile silicone agent and a non-volatile emollient. EP-A-0,120,210 discloses a method for preparing wax-like antiperspirant compositions formulated as stick. EP-A-4,526,780 discloses an anhydrous cream composition comprising active, an oil absorbent powdered material, a volatile silicone vehicle, a clay thickening agent and preferably a stearate salt. Minor amounts of emollients may also be included in the composition. Cream formulations, in general, have been less popular than other antiperspirant product forms. For example, some cream compositions may be sticky and produce aesthetically undesirable levels of residue on the skin. Creams may also be "messy" and otherwise difficult to apply. Special packages and dispensers have been designed to reduce such application negatives. However, cream formulations known in the literature may be unacceptable for delivery from such dispensers. It has been found that the antiperspirant creams of the present invention containing selected emollients and thickening materials have good application characteristics and very good efficacy while having good aesthetic and cosmetic characteristics. In particular, such compositions are stable, allowing use in cream dispensers. Such compositions also have good rheology during application, very good efficacy, and leave low levels of visible residue on the skin or clothing. According to the present invention there is provided an antiperspirant cream composition comprising (a) from 30% to 50% by weight of a volatile silicone oil; (b) from 2% to 10% by weight of a particulate thickening material, preferably a colloidal silica or silicate, and (c) from 15% to 45% by weight of a particulate antiperspirant active material; characterised in that the composition additionally comprises from 10% to 30% by weight of a non-volatile liquid C₁₂-C₂₅ saturated or unsaturated hydrocarbon emollient having a viscosity of at least 2mm² s⁻¹ (2 cs) at 25°C selected from saturated and unsaturated dodecane, saturated and unsaturated tridecane, saturated and unsaturated tetradecane, saturated and unsaturated pentadecane, saturated and unsaturated hexadecane, saturated ad unsaturated heptadecane, saturated ad unsaturated octadecane, saturated and unsaturated nonadecane, saturated and unsaturated eicosane, saturated ad unsaturated heneicosane, saturated and unsaturated docosane, saturated and unsaturated tricosane, saturated and unsaturated tetracosane, saturated ad unsaturated pentacosane, isomers of these compounds and mixtures thereof, and wherein said composition has a penetration force value of from 150 g to 800 g at 25°C and at 50% relative humidity, and a total level of particulate material of from 32% to 50% by weight. These compositions preferably contain from about 0.1% to about 60% of an optional non-volatile emollient, from about 0.1% to about 10% of a particulate hydrophilic polymer, and a cosmetic powder material, at a level of from about 0.5% to about 20%. This invention also provides methods for making these compositions. The antiperspirant cream compositions of this invention comprise: a volatile silicone oil, a non-volatile liquid C₁₂-C₂₅ saturated or unsaturated hydrocarbon emollient, a particulate thickening material, and an antiperspirant active. They may also contain certain optional components, such as (for example), additional emollients, hydrophillic polymers, cosmetic powders, colorants, perfumes and emulsifiers. The essential and optional components to be included in these creams must be "cosmetically acceptable", i.e., safe for human use and aesthetically acceptable at the levels encompassed by the present invention, at a reasonable risk/ benefit ratio. These compositions (herein "antiperspirant creams") encompass any semi-solid composition that is suitable for depositing antiperspirant material on human skin. The creams of his invention have a penetration force value of from 150 grams (g) to 800g, preferably from 200g to 550g at 25°C and at 50% relative humidity, as measured with a Stevens Texture Analyzer, manufactured by C. Stevens & Sons, Ltd. (This value is the force required to move a standardized 2 cm diameter disk through the product, for a distance of 15 millimeters, at a rate of 2 mm/ second.) As used herein, all percentages are by weight of the total composition. These compositions preferably contain from 0.1% to 60% of an optional non-volatile emollient, from 0.1% to 10% of a particulate hydrophilic polymer, and a cosmetic powder material, at a level of from 0.5% to 20%. This invention also provides methods for making these compositions. The non-volatile emollient is present at a level of from about 10% to about 30%, preferably from about 12% to about 25%. The particulate thickening material is preferably present at a level of from 2% to 7%, more preferably from 2.8% to 4.5%. The particulate hydrophilic polymer is preferably present at a level of from 0.25% to 5.0% and most preferably from about 1.0% to about 3.0%. Also preferably, the antiperspirant active material is present at a level of from 20% to 30%. The total level of all particulate materials (including the thickening material, the antiperspirant active material, and any optional materials in particulate form) is from 32% to 50%, more preferably from 32% to 40%. As used herein "particulate" materials are solid materials that are substantially insoluble in the volatile silicone oils and non-volatile emollients of the cream composition. The components of the invention are described in detail below. Volatile Silicone Oil : The antiperspirant compositions of this invention contain one or more volatile polyorganosiloxanes, which may function as a liquid emollient. (As used herein, "volatile" refers to those materials which have a measurable vapor pressure at ambient conditions.) The volatile polyorganosiloxanes useful herein may be cyclic or linear. A description of various volatile silicones is found in Todd, et al., "Volatile Silicone Fluids for Cosmetics", 91 Cosmetics and Toiletries 27 - 32 (1976). Preferred cyclic silicones include polydimethylsiloxanes containing from about 3 to about 9 silicon atoms, preferably containing from about 4 to about 5 silicon atoms. Preferred linear silicone oils include the polydimethylsiloxanes containing from about 3 to about 9 silicon atoms. The linear volatile silicones generally have viscosities of less than about 5 mm².s⁻¹ (cSt) at 25°C., while the cyclic materials have viscosities of less than about 10 mm².s⁻¹ (cSt). Examples of silicone oils useful in the present invention include: Dow Corning 344, Dow Corning 345, and Dow Corning 200 (manufactured by the Dow Corning Corporation); Silicone 7207 and Silicone 7158 (manufactured by the Union Carbide Corporation); SF1202 (manufactured by General Electric); and SWS-03314 (manufactured by Stouffer Chemical). Non-Volatile Liquid Emollient : The antiperspirant compositions of the present invention contain from 10% to 30% of a non-volatile liquid C₁₂ to C₂₅ saturated or unsaturated hydrocarbon emollient with a viscosity of at least 2 mm².s⁻¹ (cSt) at 25°C, preferably 10 mm².s⁻¹ (cSt) at 25°C. The non-volatile emollient is preferably present at a level of from 12% to 30%, more preferably from 15% to 25%. The inclusion of these non-volatile emollients improves the removal of the antiperspirant residue during washing. The non-volatile liquid hydrocarbon emollients useful herein are non-polar or essentially non-polar. The non-volatile emollient herein is selected from saturated and unsaturated dodecane, saturated and unsaturated tridecane, saturated and unsaturated tetradecane, saturated and unsaturated pentadecane, saturated and unsaturated hexadecane, saturated and unsaturated heptadecane, saturated and unsaturated octadecane, saturated and unsaturated nonadecane, saturated and unsaturated eicosane, saturated and unsaturated heneicosane, saturated and unsaturated docosane, saturated and unsaturated tricosane, saturated and unsaturated tetracosane, saturated and unsaturated pentacosane, isomers of these compounds and mixtures thereof. Preferred compounds include these isomers of C₁₆ to C₂₅ saturated and unsaturated hydrocarbons. More preferred are C₁₆ to C₂₃ saturated and unsaturated hydrocarbons such as the saturated and unsaturated isomers of hexadecane and eicosane. Even more preferred are the isomers are highly branched saturated or unsaturated alkanes, the permethylsubstituted isomers. Most preferred are the permethylsubstituted isomers of hexadecane and eicosane, such as 2, 2, 4, 4, 6, 6, 8, 8-dimethyl-10-methylundecane and 2, 2, 4, 4, 6, 6-dimethyl-8-methylnonane, sold by Permethyl Corporation. Particulate Thickening Material : The compositions of this invention contain one or more materials which form a semi-solid cream formulation (as described above) with the other essential components. Such materials include colloidal silicas, silicates, and mixtures thereof. These materials preferably form a cream having a gel-like, shear-thinning matrix when used in the manner of this invention. Sillcates useful herein include, for example, montmorillonite clays and hydrophilically treated montmorillonites, e.g., bentonites, hectorites and colloidal magnesium silicates. When silicates are used as the thickening material of the present creams, they are preferably present at a level of from 5% to 10%. Commercially-available silicates useful herein include, for example, the "Bentone (RTM)" series of hydrophobic bentonites, manufactured by NL Industries, Inc. When hydrophobically-treated bentonites are used as the thickening material, the creams of this invention also preferably contain a gel-promoting agent. Gel-promoting agents useful herein include, for example, water, lower alcohols (such as ethanol), acetone, propylene carbonate, and mixtures thereof. Such materials are preferably included at a level of from 1% to 3%, more preferably from 1.5% to 2.5%. A preferred thickening material useful herein is finely divided silica, or "colloidal silica", which is comprised of micron to sub-micron sized silica particulates, with high surface areas (preferably greater than about 100 square meters per gram of material). Preferably, the colloidal silica material is less than about 1 µm in size. Also preferably, the silica material used in the present compositions is a fumed silica. Fumed silicas can generally be described as fluffy, white, superfine powders of extremely low bulk density but having high surface areas. These fumed silicas are typically made by a vapor phase process that produces colloidal silica by the hydrolysis of silicon tetrachloride at a very high temperature. These materials typically consist of about 99.8% silicon dioxide by weight (on a moisture free basis), existing in three dimensional branched chain aggregates, with a surface that is hydrophilic and capable of hydrogen bonding. Such silicas have surface areas ranging from about 2.5 to about 1,200 square meters per gram. Colloidal silica materials are described in Hardy, et al., "The Use of Fumed Silica in Cosmetics", 2 Cosmetic Technology 35 (1980) and R. Iler, The Chemistry of Silica (1979). Colloidal silica materials among those useful herein are available from a variety of sources, including Syloid (RTM) silicas (manufactured by Davison Chemical Division of W. R. Grace), Cab-O-Sil (RTM) (manufactured by Cabot Corporation), and Aerosil (RTM) manufactured by Degussa A.G.). Cab-O-Sil (RTM) is a preferred commercially available colloidal silica useful herein, with a surface area ranging from about 200 to about 400 square meters per gram. Particulate Antiperspirant Material : The particulate antiperspirant materials of this invention comprise any compound or composition or mixtures thereof, having antiperspirant activity. Astringent metallic salts are preferred antiperspirant materials for use herein, particularly including the inorganic and organic salts of aluminum, zirconium and zinc, and mixtures thereof. Particularly preferred are the aluminum and zirconium salts such as aluminum halides, aluminum hydroxy halides, zirconyl oxide halides, zirconyl hydroxy halides, and mixtures thereof. Preferred aluminum salts include those of the formula Al₂(OH) a Cl b ·xH₂O wherein a is from about 2 to about 5; a+b = 6 ; x is from about 1 to about 6; and wherein a, b, and x may have non-integer values. Particularly preferred are aluminum chlorhydroxides referred to as "5/6 basic chlorhydroxide", wherein a = 5, and "2/3 basic chlorhydroxide," wherein a = 4. Processes for preparing aluminum salts are disclosed in the following documents: US-A-3,887,692, Gilman, issued June 3, 1975; US-A-3,904,741, Jones et al., issued September 9, 1975; US-A-4,359,456, Gosling, et al., issued November 16, 1982; and GB-A-2,048,229, Fitzgerald, et al., published December 10, 1980. Mixtures of aluminum salts are described in GB-A-1,347,950, Shin, et al., published February 27, 1974. Zirconium salts are also preferred for use in antiperspirant creams of the present invention. Such salts are of the general formula ZrO(OH) 2-a Cl a ·xH₂O wherein a is from about 1.5 to about 1.87; x is from about 1 to about 7; and wherein a and n may have non-integer values. These zirconium salts are disclosed in BE-A-0,825,146, Schmitz, issued August 4, 1975, Particularly preferred zirconium salts are those complexes also containing aluminum and glycine, commonly known as "ZAG complexes". Such ZAG complexes contain aluminum chlorhydroxide and zirconyl hydroxychloride of the formulae detailed above. These compounds in ZAG complexes are disclosed in US-A-3,679,068, Luedders, et al., issued February 12, 1974, and US-A-4,120,948, Shelton, issued October 17, 1978. Also useful are the ZAG complexes disclosed in GP-A-Application 2,144,992, Callaghan et al., published March 20, 1985. These ZAG actives, when analyzed by high pressure gel permeation chrometography, exhibit a distribution pattern having four or more successive peaks or "bands" where the height ratio of Bands IV to III is greater than 2:1. More preferred are ZAG actives which have a total area under the curve of bands I and II of less than about 10%, preferably less than about 5%, more preferably less than about 2% and most preferably less than about 1%. The compositions of the present invention may also contain optional components which modify the physical characteristics of the vehicles, or serve as "active" components when deposited on the skin in addition to the particulate antiperspirant material. Additional active components include bacteriostats and fungistats. The particular non-active components that may be useful will depend upon the form of application that is desired. Such components include, for example, emollients, colorants, perfumes, powders, and emulsifiers. Optional components useful herein are described in the following documents: US-A-4,049,792, Elsnau, issued September 20, 1977; CA-A-1,164,347, Beckmeyer, et al., issued March 27, 1984; EP-A-0,117,070, May, published August 29, 1984; and Geria, "Formulation of Stick Antiperspirants and Deodorants," 99 Cosmetics & Toiletries 55-60 (1984). The present antiperspirant compositions preferably contain from 0.1% to 60% of a non-volatile emollient having a viscosity of at least 2mm².s⁻¹ (2 cSt), at 25°C. The non-volatile emollient may consist of a single emollient, or a, mixture having an overall viscosity of at least 2 mm².s⁻¹ (2cSt). Preferably the non-volatile emollient has a viscosity of from about 100 mm².s⁻¹ (100 cSt) to about 500 mm².s⁻¹ (500 cSt), more preferably from about 200 mm².s⁻¹ (200 cSt) to about 500 mm².⁻¹ (500 cSt). Non-volatile emollients useful herein include fatty acid and fatty alcohol esters, nearly water-insoluble ethers and alcohols, polyorganosiloxanes, and mixtures thereof. Such emollients are described in 1 Cosmetics, Science and Technology 27-104 (M. Balsam and E. Sagarin ed. 1972), and US-A-4,202,879, Shelton, issued May 13, 1980. The present compositions preferably contain a non-volatile silicone oil as an emollient ,material. Such silicone oils include polyalkylsiloxanes, polyalkylarylsiloxanes, and polyethersiloxane copolymers. Such polyalkyl siloxanes include the Vicasil (RTM) series (sold by General Electric Company) and the Dow Corning 200 series (sold by Dow Corning Corporation). Polyalkylaryl siloxanes include poly methylphenyl siloxanes having viscosities of from about 15 to about 65 mm².s⁻¹ cSt at 25°C. These are available, for example, as SF 1075 methylphenyl fluid (sold by General Electric Company) and 556 Cosmetic Grade Fluid (sold by Dow Corning Corporation). The antiperspirant cream compositions of the present invention preferably contain from 0.5% to 20% of at least one particulate hydrophilic polymer. The inclusion of the hydrophilic polymer assists in removal of the antiperspirant residue by washing. Preferred hydrophilic polymers include cellulose ether polymers (cationic, neutral, and anionic), modified starches, polyamides, (especially polyacrylamides), and polypeptides, as disclosed generally in Davidson, Handbook of Water-Soluble Gums and Resins , 1980. Preferably, the polymer is selected from non-ionic cellulose ether polymers. Such cellulose ether polymers are disclosed in Davidson, supra, Chapters 4 and 12-13. More preferred are cellulose ether polymers selected from alkylcelluloses (e.g., methylcellulose), hydroxyalkylalkylcelluloses (e.g., hydroxypropylmethylcellulose; hydroxybutylmethylcellulose; hydroxyethylmethylcellulose; ethylhydroxyethylcellulose), hydroxyalkylcelluloses (e.g., hydroxyethylcellulose; hydroxypropylcellulose), and mixtures thereof. Most preferred are hydroxyalkylcelluloses, especially hydroxyethylcellulose and hydroxypropylcellulose. The cellulose ether polymers typically have molecular weights within the range of from about 20,000 to about 5,000,000 and more typically within the range of from about 50,000 to about 500,000. Cellulose ether polymers are described in "Handbook of Water-Soluble Gums and Resins" (McGraw-Hill Book Co. & N.Y.; 1980; Davidson, editor), Chapters 3, 4, 12 and 13. The cellulose ether polymers to be utilized herein bind to polar solvents such as water and ethanol. However, as utilized in the antiperspirant compositions herein, these polymers are exposed to very little if any polar solvents. Furthermore, the cellulose ether polymers utilized herein are not dissolved in the antiperspirant composition but rather are distributed throughout the composition in particulate form. It is preferred that the particle size be small to prevent the antiperspirant composition from having a "gritty" feel. Preferably, the particle size is from 1 to about 500 µm, more preferably from about 1 to about 100 µm, and most preferably from about 15 to about 75 µm. In the case of non-spherical particles, the longest dimension of the particles is considered for these preferred limits. Representative examples of preferred cellulose ether polymers useful in the compositions of the present invention are: hydroxyethylcellulose (Natrosol (RTM) 250M sold by Hercules Chemical Co.); hydroxypropylcellulose (Klucel (RTM) sold by Hercules Chemical Co.); methylcellulose (Methocel (RTM)-A supplied by Dow Chemical Co.); and poly(ethylene oxide) (Polyox (RTM) sold by Union Carbide Corp.). Most preferred is hydroxyethylcellulose. The hydrophilic polymers in total typically comprise from 0.1% to 10% by weight of the compositions of the present invention, more preferably from 0.25% to 5%, and most preferably from 1% to 3%. A preferred optional component is a cosmetic powder (or mixture of powders), incorporated at a level of from 0.5% to 20%, preferably from 2% to 10%. Preferred cosmetic powders useful herein include "inert spherical particulate materials" having a mean diameter of at least about 10 µm. The "spherical particulate materials" are preferably essentially free of (i.e., containing less than 2% bye weight of material) particulates having diameters greater than about 150 µm. Also preferably, the particles have a mean diameter of from about 15 µm to about 75 µm. Commercially-available inert particulate materials among those useful herein may be of a nonuniform size distribution, containing some particles outside the size ranges described herein. For the purposes of this invention, such non-uniform materials preferably have a mean diameter within the ranges described above. Particularly preferred for use in the present invention is the inclusion of the inert spherical particulate materials in a ratio of particulate hydrophilic polymer to spherical particulate materials of from 10:1 to 1:10, preferably 5:1 to 1:5. As referred to herein, "inert particulates" are those particulates comprised of materials or mixtures of materials which neither melt nor decompose nor react with the wax thickener materials, silicone oils or other components of the antiperspirant sticks, under the conditions of preparation and of use. Among the optional particulate materials that may be incorporated in this invention include those comprised of polyolefins (such as polystyrene, polyethylene, and polypropylene), nylon, waxes, Teflon®, essentially water-insoluble cross-linked starches, and mixtures thereof. Preferred inert particulate materials include those comprised of polyolefins, particularly polyethylene. Without being limited by theory, it is believed that these materials enhance the stability of the antiperspirant cream matrix by adding support to the matrix formed by the particulate thickening material. Therefore it is preferred that the density of the particulate material be less than or equal to the density of the mixture of the volatile and nonvolatile emollients. Preferably, the density of the particulate material is less than the density of the emollient mixture. Polyethylene materials, as well as particulates made from other polyolefins, can be prepared by any of several methods known in the art. (See, e.g., US-A-2,825,721, Hogan, et al., issued March 4, 1958.) Polyethylene polymers with low molecular weights such as 1,500 to 3,000, as well as polymers of such high molecular weights as 35,000 to 100,000, may be used. One such polyethylene powder useful in this invention is Microthene®, manufactured by U.S.I. Chemicals, having a mean particle diameter of from about 14 to about 20 µm. Among other commercially-available materials useful herein are 3M Glass Bubbles (soda-lime borosilicate glass spheres sold by 3M Company) and Miralite® (low density polyvinylidene chloride hollow microspheres, of approximately 30 µm, mean diameter, sold by Pierce & Stevens Chemical Corporation). Other cosmetic powders useful herein include silicate powders (including talc, aluminum silicate, and magnesium silicate), modified corn starches, metallic stearates, and mixtures thereof. Talc is described in K. S. Plotkin, "Cosmetic Talc" 11 C.T.F.A. Cosmetic Journal 13-16 (1979). Commercially-available powders include, for example, Veecote (anhydrous aluminum silicate, sold by R. T. Vanderbilt Company, Inc.) and Dry Flo (aluminum starch succinate, sold by National Starch and Chemicals Company). A preferred method for making the antiperspirant creams of this invention generally comprises the steps of: (a) admixing the essential and optional components of said creams, under low-shear conditions, yielding a liquid mixture having a penetration value of from 15 grams to 200 grams at 25°C and at 50% relative humidity; and (b) milling said liquid mixture, under high shear conditions, with a dispersing disc at a disc tip speed of at least 8 meters/second. These processes may be batch processes (i.e., involving discrete processing steps) or continuous (i.e., wherein the product composition is passed between processing steps in essentially continuous increments). The equipment used in this preferred process is commercially available. The admixing step preferably involves first admixing the volatile silicone oil and non-volatile emollient and any other liquid components. The antiperspirant active material is then added, followed by the particulate hydrophilic polymer and any other particulate components. Preferably the thickening material is added last. Conventional blending equipment may be used. Preferably the penetration value of the mixture is from about 15g to 200g at 25°C and at 50% relative humidity. The high-shear milling step is preferably performed in a conventional dispersing disc milling apparatus. The tip speed of the dispersing disc is preferably from 8 meters/second to 22 meters/second. The mixture is preferably milled until a maximum penetration value is obtained, preferably at least 200g, preferably from 300g to 400g at 25°C and at 50% relative humidity. Creams of this invention may be packed in conventional antiperspirant cream containers, known in the art. Such packages typically contain the cream in bulk form. The cream is then applied by hand, or by a pad or similar applicator device. However, the present creams may also be provided in other package dispensers, designed to extrude or otherwise directly apply the creams to the skin. The following non-limiting examples illustrate the compositions, processes and uses of the present invention. EXAMPLE I An antiperspirant cream, according to this invention, was made comprising: Component % (by weight) Cyclomethicone (D5) 43.5 dimethicone (350 mm².s⁻¹) 4.0 iso-eicosane 13.0 Cab-O-Sil (RTM) HS-5 4.0 Microthene (RTM) FN510 6.0 Natrosol (RTM) 2.0 Reach AZ 26.7 fragrance 0.8 The cyclomethicone, dimethicone, iso-eicosane and perfume are added to a stainless steel mixing vessel. The Cab-O-Sil (RTM) is then added, followed by the Microthene (RTM) and Natrosol (RTM) and, finally, the antiperspirant active. The composition is thoroughly stirred after addition of each particulate material. The composition is then milled, using a Black & Decker Die Grinder (Model 4420, type 4) with a 6.35 cm diameter Cowles dispersing blade at approximately 6000 rpm, for approximately 5 minutes. The penetration force value of the milled composition is approximately 300 grams at 25°C and at 50% relative humidity. An antiperspirant cream formulation, comprised as above, is applied to the underarm area of a human subject, and reduces the perspiration in the applied area. EXAMPLE II An antiperspirant cream, according to this invention, is made comprising: Component % (by weight) cyclomethicone (D5) 43.5 dimethicone (350mm².s⁻¹) 6.0 iso-eicosane 12.0 Cab-O-Sil (RTM) HS-5 4.0 Microthene (RTM) FN510 5.0 polyox 2.0 Reach AZ 26.7 fragrance 0.8 The cyclomethicone and dimethicone and perfume are added to a stainless steel mixing vessel. The antiperspirant active is then added, followed by the Microthene and, finally, the Cab-O-Sil (RTM). The composition is thoroughly stirred after addition of each particulate material. The composition is then milled, using a Black & Decker Die Grinder (Model 4420, type 4) with a 6.35 cm diameter Cowles dispersing blade at approximately 6000 rpm, for approximately 5 minutes. The penetration force value of the milled composition is to be approximately 300 grams at 25°C and at 50% relative humidity. An antiperspirant cream formulation, comprised as above, is applied to the underarm area of a human subject, and reduced the perspiration in the applied area. EXAMPLE III An antiperspirant cream, according to this invention, is made comprising: The antiperspirant cream is made by a method analogous to that described in Example 1. The penetration force value is approximately 520 at 25°C and at 50% relative humidity. EXAMPLE IV An antiperspirant cream, according to this invention, is made comprising: Component % (by weight) cyclomethicone (D4) 45.3 iso-eicosane 20.0 Cab-O-Sil (RTM) 3.0 Microthene (RTM) 5.0 ZAG antiperspirant active 26.7 The antiperspirant cream is made by a method analogous to that described in Example 1. The penetration force value is approximately 170 at 25°C and at 50% relative humidity. EXAMPLE V An antiperspirant cream, according to this invention, is made comprising: Component % (by weight) cyclomethicone (D4) 34.3 dimethicone (350 mm².s⁻¹) 4.0 iso-eicosane 13.0 Cab-O-Sil (RTM) 5.0 Natrosol (RTM) 4.0 Microthene (RTM) 13.0 ZAG antiperspirant active 26.7 The antiperspirant cream is made by a method analogous to that described in Example 1. The penetration force value is approximately 750 at 25°C and at 50% relative humidity. EXAMPLE VI An antiperspirant cream, according to this invention, is made comprising: Component % (by weight) cyclomethicone (D5) 39.3 iso-eicosane 10.0 Bentone (RTM) 38 3.0 Propylene Carbonate 1.5 Cab-O-Sil (RTM) 3.0 Natrosol (RTM) 1.0 Microthene (RTM) 6.0 talc 5.0 Veecote 4.5 ZAG antiperspirant active 26.7 The antiperspirant cream is made by a method analogous to that described in Example I. The penetration force value is approximately 350 at 25°C and at 50% relative humidity.

Claims: An antiperspirant cream composition comprising: (a) from 30% to 50% by weight of a volatile silicone oil; (b) from 2% to 10% by weight of a particulate thickening material, preferably a colloidal silica or silicate, and (c) from 15% to 45% by weight of a particulate antiperspirant active material; characterised in that the composition additionally comprises from 10% to 30% by weight of a non-volatile liquid C₁₂-C₂₅ saturated or unsaturated hydrocarbon emollient having a viscosity of at least 2mm² s⁻¹(2 cSt) at 25°C selected from saturated and unsaturated dodecane, saturated and unsaturated tridecane, saturated and unsaturated tetradecane, saturated and unsaturated pentadecane, saturated and unsaturated hexadecane, saturated and unsaturated heptadecane, saturated and unsaturated octadecane, saturated and unsaturated nonadecane, saturated and unsaturated eicosane, saturated and unsaturated heneicosane, saturated and unsaturated docosane, saturated and unsaturated tricosane, saturated and unsaturated tetracosane, saturated and unsaturated pentacosane, isomers of these compounds and mixtures thereof, and wherein said composition has a penetration force value of from 150 g to 800 g at 25°C and at 50% relative humidity, and a total level of particulate material of from 32% to 50% by weight. An antiperspirant cream composition according to Claim 1 which further comprises from 0.1% to 60% by weight of a non-volatile emollient selected from fatty acid and fatty alcohol esters, essentially water-insoluble ethers, essentially water-insoluble alcohols, polyorganosiloxanes and mixtures thereof. An antiperspirant cream composition according to Claim 1 or 2 wherein said non-volatile emollient is a polyorganosiloxane. An antiperspirant cream according to any of Claims 1-3 which further comprises from 0.1% to 20% by weight of a hydrophilic polymer selected from cellulose ether polymers, modified starches, polyamides, polypeptides and mixtures thereof, and is preferably a cellulose ether polymer. An antiperspirant cream composition according to any of Claims 1-4 additionally comprising from 0.5% to 20% by weight of a cosmetic powder material, preferably a spherical particulate material. An antiperspirant cream according to Claim 5, wherein the cosmetic powder is a spherical particulate material and the weight ratio of hydrophilic polymer to spherical particulate materials is from 1:5 to 5:1. An antiperspirant cream composition according to any of Claims 1-6 additionally comprising a gel-promoting agent. An antiperspirant cream according to any of Claims 1-7 wherein said particulate antiperspirant active material is a zirconium aluminum glycine complex and wherein said C₁₂-C₂₅ saturated or unsaturated hydrocarbon emollient is selected from hexadecane, eicosane, isomers thereof and mixtures thereof. A method for making an antiperspirant cream composition of any of Claims 1-8 characterised in that it comprises the steps of: (a) admixing said volatile silicone oil, said non-volatile emollient, said particulate thickening material and said particulate antiperspirant active, under low-shear conditions, to form a liquid composition having a penetration force value of from 15 g to 200 g at 25°C and at 50% relative humidity; and (b) milling said liquid mixture, under high shear conditions using a dispersing disk at a disc tip speed of at least 8 meters/seconds.

Inventors: MEYER GERARD BERNARD, ORR THOMAS VINCENT, MEYER, GERARD BERNARD, ORR, THOMAS VINCENT
Applicants: PROCTER & GAMBLE, THE PROCTER & GAMBLE COMPANY
Application year: 1988
Main classification: A61K7
IPC codes: A61K8, A61Q15