ANTIPERSPIRANT

Abstract: An anhydrous antiperspirant product includes an anhydrous carrier vehicle; an antiperspirant active salt suspended in particle form in the vehicle; and a substantially nonvolatile masking agent of the type interactive with the antiperspirant to essentially eliminate discernible whitening without substantially inhibiting the antiperspirant activity of the salt when the product is applied to the skin.

Description: ANTIPERSPIRANT This invention relates to antiperspirant products. Antiperspirant products are well-known in the cosmetic art. One class of such products contains a suspension of an active antiperspirant ingredient, e.g., aluminum chlorohydrate, in particulate form. The antiperspirant active ingredient acts to prevent perspiration, it is believed, by going into solution in the presence of body moisture, and interacting with the sweat glands. Solid-type antiperspirants of this type typically include a gelling agent (gellant) that gives the product a solid character. These are applied by rubbing an area of the body with product to apply a layer to the skin. It is desirable that the solid product glide smoothly without flaking or crumbling. Application of antiperspirant products frequently result in objectionable aesthetic characteristics such as tackiness, and whitening, i.e., the presence of visible residues of white appearance on the skin. Many of the desirable properties-of antiperspirants can be achieved by including various ingredients to the product formulation in addition to the active agent, the vehicle and, in solids, the gelling agent. For example, surfactants may be added to ease washing of the product from the skin after use; fragrance and preservatives are commonly added; and supplemental emollients may be added to improve the application characteristics, glide, flaking, crumbling (in solids) , etc. However, such additives tend to reduce the efficacy of the product. It is believed, for example, that emollients tend to encapsulate or enrobe particulates of the active ingredient and retard the dissolution and, therefore interfere with the interaction of the active antiperspirant ingredient with the sweat glands. In accordance with one aspect of the invention, there is provided a nonagueous antiperspirant product, that includes a nonagueous carrier vehicle; an antiperspirant active salt suspended in particle form in the carrier vehicle; and a substantially nonvolatile masking agent that interacts with the antiperspirant active to essentially eliminate discernible whitening without substantially inhibiting the antiperspirant activity of the salt when the product is applied to the skin. The masking agent in preferred embodiments is selected from the group consisting of relatively nonvolatile aliphatic hydrocarbon compounds and aliphatic compounds which contain single-bonded oxygen functional groups such as alcohols and ethers, for example, alkoxylated alcohols. The masking agent in particular embodiments is selected from the group consisting of PPG-10 Butanediol and hydrogenated polyisobutene. Preferred antiperspirant products include a sufficient quantity of a gelling agent so that the antiperspirant product can be used as a solid, but a reduced amount of, or no, gelling agent may be used if it is desirable to make a more liquid type product. The vehicle generally is volatile and makes up between about thirty to about fifty percent of- the product and in preferred embodiments, is a volatile silicone such as cylcomethicone. Other suitable vehicles include aliphatic hydrocarbons such as isododecane, dimethicone, polyphenylmethylsiloxane liquids such as Dow Corning DC- 556, SD-40 alcohol, and C 12 _ 15 Alcohols Benzoate (Finsolv TN) . The active ingredient, in particulate form, is suspended in the carrier vehicle. Preferred active antiperspirant active components for use in the antiperspirant products include well-known salts such as aluminum zirconium chlorohydrates, aluminum chlorohydrates and other polyhydroxy complexes of basic aluminum salts, such as aluminum sesquichlorohydrate, aluminum dichlorohydrate, aluminum chloride, aluminum zirconium trichlorohydrate, aluminum zirconium tetrachlorohydrate, aluminum zirconium pentachlorohydrate and aluminum zirconium octachlorohydrate. A particularly preferred active ingredient is Aluminum Zirconium Tetrachlorohydrex-Gly with enhanced activity (as described in U.S. Patent No. 4,775,528). The active antiperspirant component(s) should be present in an amount effective to reduce perspiration when applied to the skin. The precise limits on the amount of active antiperspirant component that can be used will vary with the particular component and formula. As a general rule, however, the antiperspirant product should contain anywhere from about ten to about thirty percent (more preferably about twenty-five percent) of active antiperspirant component. The active ingredient is provided in particulate form, for ease of processing and to avoid settling from the suspension. In preferred embodiments, the products of the invention do not require conventional suspending agents such as clays and silicas (.e. g. , bentonite) . Preferably at least fifty percent of the particulates of the antiperspirant active are of about ten microns or less in size, and more preferably at least ninety percent of the particulateε of the antiperspirant active are of about ten microns or less in size (Superfine) . Larger particulates may also be used. The masking agent, in quantity less than fifty percent by weight, preferably about twenty to forty percent by weight, of the antiperspirant active salt, and five to nine pecent by weight of the total product provides essentially complete absence of discernible whitening, without substantial inhibition of antiperspirant activity. The masking agent preferably is a relatively nonvolatile emollient material (i.e., it enhances glide and smoothness of application) and, it is believed, reduces whitening by interacting with the particulates to produce an optical effect that tends to reduce light scattering and apparent whiteness. The agent does not, however, substantially impede dissolution of the antiperspirant ingredient by body fluids or the interaction of the dissolved antiperspirant ingredient with the sweat glands. Suitable masking agents are saturated aliphatic carbon compounds with less than thirty-eight carbon atoms. Preferred masking agents include PPG-10 Butanediol (MACOL 57) (Mazer Chemicals, Gurnee, Illinois) and a hydrogenated polyisobutene [-CH 2 -C(CH 3 ) 2 -] n where n (the number of repeating units) = 6 to 8 (cosmetic grade Panalene L-14E, Amoco Chemical, Chicago, IL) . Another suitable polyisobutene mixture is available from Nippon Oils under the name Polysynlane. In addition, other compatible emollients, surfactants, preservatives, fragrances and additionally for solids, gelling agents may be included. Examples of suitable gelling agents include hydrogenated castor oil, fatty alcohols such as stearyl alcohol, Stearamide MEA, polyethylene-vinyl acetate copolymers, polyethylene homopolymers and blends and combinations of these. Preferably, the amount of gelling agent in the solid antiperspirant product should be sufficient to cause the liquid vehicle to gel (i.e., become free-standing). In general, the solid antiperspirant product should include between about fifteen percent and about twenty-five percent (more preferably about twenty percent) of gelling agent. For liquid antiperspirant products, it may be desirable to use some gelling agent in the antiperspirant product for thickening, even though a sufficient quantity of gelling agent is not used to obtain a free-standing composition. Supplemental emollients generally range from about one to ten percent of the product and may be dioctyl cyclohexane, propoxylated ethers such as PPG-14 Butyl Ether, isopropyl palmitate, isopropyl myristate, myristal myristate, dimethicone, C 12 ~ 15 Alcohol Benzoates, diisopropyl sebacate, and diisopropyl adipate. These can add to desirable aesthetic properties such as smoothness, glide, and the perception of drier and nontacky application. In one particular embodiment, the product is a solid antiperspirant including a volatile cyclomethicone (DC-345) carrier, Superfine Aluminum-Zirconium Tetrachlorohydrex-Gly active ingredient of enhanced activity (as in U.S. Patent 4,775,528), a hydrogenated polyisobutene masking agent (Panalane) , PPG-14 Butyl Ether (Probutyl 14) and dioctyl cyclohexane (Cetiol S) emollients, Steareth-21 surfactant, and hydrogenated castor oil and stearyl alcohol gelling agents. In another particular embodiment, the product is a solid antiperspirant including a volatile cyclomethicone (DC-345) carrier, Superfine Aluminum-Zirconium Tetrachlorohydrex-Gly active ingredient of enhanced activity (as in U.S. Patent 4,775,528), a PPG-10 Butanediol (MACOL 57) masking agent, myristyl myristate emollient, Steareth- 21 surfactant, and hydrogenated castor oil and stearyl alcohol gelling agents. The ingredients are formulated in concentrations for balanced emulsifying, stability, aesthetics and efficacy. In particular embodiments, the gelling agents may range from fifteen to twenty-five percent and supplemental emollients may range from one to ten percent. Active ingredient particles of less than ten microns size are in a solid suspension within a matrix formed substantially of the gelling agent. Dioctyl cyclohexane may be used to stabilize the suspension and prevent phase separation of the masking agent. The final product is a free standing solid suspension of active antiperspirant ingredient particles. The following Examples illustrate representative antiperspirant products and are given by way of illustration only and are not to be considered as being limiting. The amounts in the Examples and the claims are in weight percent. The formulations of the Examples provide antiperspirant products that are characterized by essentially complete absence of discernable (to an experienced visual evaluator) whitening and provide antiperspirant efficacy of at least eighty percent of commercially available solid antiperspirant products (as measured clinically by gravimetric means) . The solid products also exhibit smooth glide upon application without flaking or crumbling. The ingredients may be processed as described or conventionally known. For roll-on or aerosol products, the ingredients, following teachings' herein, may be processed as conventionally known. Example 1 CTFA NAME % Active CYCLOMETHICONE (DC-345) 37.7 ALUMINUM ZIRCONIUM TETRACHLOROHYDREX-GLY 23.5 STEARYL ALCOHOL 19.0 HYDROGENATED POLYISOBUTENES (Panalene) 6.0 PPG-14 BUTYL ETHER (Probutyl 14) 5.8 HYDROGENATED CASTOR OIL (MP 70) 3.5 DIOCTYL CYCLOHEXANE (Cetiol S) 3.0 STEARETH-21 (Brij 721S) 1.0 FRAGRANCE 0.3 PROPYLPARABEN 0.2 The Example 1 solid product is made by combining and mechanically mixing the vehicle, the masking agent and supplemental emollients until homogeneous. The active ingredient in powder form is then added, and the mixture is heated from room temperature to 60°C over a period of about one-quarter hour. At 60°C, gellant (i.e., hydrogenated castor oil and stearyl alcohol) is added and the mixture is continued to be heated to about 85°C (a temperature where the gellant has melted) with agitation to insure complete homogeneity. The mixture is cooled to about 64°C and fragrance is added. The mixture is cooled again to about 53°C and poured into suitable containers. Example 2 CTFA NAME & ACTIVE CYCLOMETHICONE (DC-345) 39.0 ALUMINUM ZIRCONIUM TETRACHLOROHYDREX-GLY 23.1 STEARAMIDE MEA (Monamid S) 19.0 PPG-14 BUTYL ETHER (Probutyl 14) 8.0 HYDROGENATED POLYISOBUTENES (Panalene) 5.5 TALC 4.0 STEARETH 21 (Brij 721S) 1.0 FRAGRANCE 0.4 The ingredients of Example 2 are processed using a procedure similar to Example l with the mixture being heated to about 95°C after addition of the gellant, the temperature being held for about 15 minutes, then cooled to 80-85°C, and after fragrance is added, the mixture is stirred and immediately poured into suitable containers. Example 3 CTFA NAME % ACTIVE CYCLOMETHICONE (DC-345) 48.3 ALUMINUM ZIRCONIUM TETRACHLOROHYDREX-GLY 23.6 STEARYL ALCOHOL 15.2 PPG-10 BUTANEDIOL (MACOL 57) 5.0 HYDROGENATED CASTOR OIL MP 70 2.9 TALC 2.2 STEARETH-21 (Brij 721S) 1.0 PEG 8 DISTEARATE 1.0 FRAGRANCE 0.6 PROPYLPARABEN 0.2 100.0 The Example 3 solid product is made by combining and mechanically mixing the vehicle, the masking agent and supplemental emollients until homogeneous. The active ingredient in powder form is then added, and the mixture is heated from room temperature to 60°C over a period of about one-quarter hour. At 60°C, gellant is added'and the mixture is continued to be heated to about 85°C (a temperature where the gellant has melted) with agitation to insure complete homogeneity. The mixture is cooled to about 64°C and fragrance is added. The mixture is cooled again to about 53°C and poured into suitable containers. Example 4 CTFA NAME CYCLOMETHICONE (DC-345) ALUMINUM ZIRCONIUM TETRACHLOROHYDREX-GLY STEARYL ALCOHOL PPG-10 BUTANEDIOL (MACOL 57) HYDROGENATED POLYISOBUTENES (Panalene) HYDROGENATED CASTOR OIL MP 70 TALC STEARETH-21 (Brij 721S) PEG 8 DISTEARATE FRAGRANCE PROPYLPARABEN 100.0 The Example 4 solid product is made by combining and mechanically mixing the vehicle, the masking agent and supplemental emollients until homogeneous. The active ingredient in powder form is then added, and the mixture is heated from room temperature to 60°C over a period of about one-quarter hour. At 60°C, gellant is added and the mixture is continued to be heated to about 85°C (a temperature where the gellant has melted) with agitation to insure complete homogeneity. The mixture is cooled to about *64°C and fragrance is added. The mixture is cooled again to about 53°C and poured into suitable containers. Example 5 CTFA NAME % ACTIVE CYCLOMETHICONE (DC-345) 45.9 ALUMINUM ZIRCONIUM TETRACHLOROHYDREX-GLY 22.7 STEARYL ALCOHOL 15.5 PPG-10 BUTANEDIOL (MACOL 57) 4.8 HYDROGENATED POLYISOBUTENES (PANALENE) 3.8 HYDROGENATED CASTOR OIL MP 70 2.8 MYRISTYL MYRISTATE 2.0 STEARETH-21 (Brig 721S) 1.0 PEG 8 DISTEARATE 0.9 FRAGRANCE 0.6 100.0 The Example 5 solid product is made by combining and mechanically mixing the vehicle, the masking agent and supplemental emollients until homogeneous. The active ingredient in powder form is then added, and the mixture is heated from room temperature to 60°C over a period of about one-quarter hour. At 60°C, gellant is added and the mixture is continued to be heated to about 85°C (a temperature where the gellant has melted) with agitation to insure complete homogeneity. The mixture is cooled to about 64°C and fragrance is added. The mixture is cooled again to about 53°C and poured into suitable containers. The product of this Example 5 has antiperspirant efficacy that is unsurpassed by commercially available solid antiperspirant products as measured clinically in a hot room by gravimetric sweat reduction determinations. While particular embodiments of the invention have been shown and described, various modifications will be apparent to those skilled in the art, and therefore it is not intended that the invention be limited to the disclosed embodiments or to details thereof, and departures may be made therefrom within the spirit and scope of the invention. What is claimed is:

Claims: Claims 1. A nonaqueous antiperspirant product comprising: a nonaqueous carrier vehicle, an antiperspirant active ingredient suspended in particle form in said vehicle; and a substantially nonvolatile masking agent of the type interactive with said active ingredient in a manner to essentially eliminate discernible whitening without substantially inhibiting the antiperspirant activity of said active ingredient when said product is applied to the skin. 2. The product of claim 1 wherein said masking agent is selected from the group consisting of relatively nonvolatile aliphatic hydrocarbon compounds and aliphatic compounds which contain single-bonded oxygen functional groups such as alcohols and ethers. 3. The product of claim 1 wherein said masking agent is selected from the group consisting of PPG-10 Butanediol and hydrogenated polyisobutene. 4. The product of claim 3 wherein said hydrogenated polyisobutene has a chain length of less than nine repeating units. 5. The product of claim 1 wherein said masking agent is water soluble. 6. The product of claim 1 wherein said masking agent comprises less than about fifty percent by weight of said active ingredient. 7. The product of claim 1 wherein said active ingredient is selected from the group consisting of aluminum zirconium chlorohydrate, aluminum chlorohydrate, and polyhydroxy complexes of basic aluminum salts, such as aluminum sesguichlorohydrate, aluminum dichlorohydrate, aluminum chloride, aluminum zirconium trichlorohydrate, aluminum zirconium tetrachlorohydrate, aluminum zirconium pentachlorohydrate and aluminum zirconium octachlorohydrate. 8. The product of claim 1 wherein said active ingredient comprises about ten to about thirty percent by weight of said product. 9. The product of claim 1 wherein said carrier vehicle is selected from the group consisting of cyclomethicone, aliphatic hydrocarbons such as isododecane. dimethicone, polyphenyl ethylsiloxane liquids, SD-40 alcohol, and C 12 _ 15 Alcohols Benzoate. 10. The product of claim 1 wherein said carrier vehicle comprises about thirty to about fifty percent by weight of said product. 11. The product of claim 1 wherein said product is a solid antiperspirant product and further comprises a gelling agent. 12. The product of claim 11 wherein said gelling agent is selected from the group consisting of hydrogenated castor oil, fatty alcohols such as stearyl alcohol, Stearamide MEA, polyethylene-vinyl acetate copolymers, polyethylene homopolymerε and blends and combinations thereof. 13. The product of claim 11 wherein said gelling agent comprises ten to thirty percent by weight of said product. 14. The product of claim 1 further comprising supplemental emollient material selected from the group consisting of propoxylated ethers such as PPG-14 butyl ether, dioctyl cyclohexane, isopropyl palmitate, isopropyl myristate, myristyl myristate, dimethicone, C 12 _ 15 Alcohol Benzoates, diisopropyl sebacate, diisopropyl adipate, and blends and combinations thereof. 15. The product of claim 14 wherein said supplemental emollient material comprises from about one to about ten percent by weight of said product. 16. The product of claim 11 further including a surfactant. 17. The product of claim 16 wherein said masking agent comprises about twenty to forty percent by weight of said active ingredient; said active ingredient comprises ten to thirty percent by weight of said product; and said carrier vehicle comprises about thirty to fifty percent by weight of said product. 18. The product of claim 17 wherein at least ninety percent of said antiperspirant active particles are of about ten microns or less in size. 19. The product of claim 1 wherein at least fifty percent of said antiperspirant active particles are of about ten microns or less in size. 20. The product of claim 19 wherein said masking agent is present in an amount that is five to nine percent by weight of said active ingredient, and said masking agent and said antiperspirant active ingredient interact to provide antiperspirant efficacy of at least eighty percent of commercially available solid antiperspirant products (as measured clinically by gravimetric means) . 21. The product of claim 20 wherein said masking agent includes a water soluble alkoxylated alcohol and provides antiperspirant efficacy that is unsurpassed by commercially available solid antiperspirant products (as measured clinically by gravimetric means) . 22. A nonaqueous solid antiperspirant product comprising: a nonaqueous carrier vehicle comprising thirty to fifty percent by weight of said product and selected from the group consisting of cyclomethicone, aliphatic hydrocarbons such as isododecane, dimethicone, polyphenylmethylsiloxane liquids, SD-40 alcohol, and C 12 _ 15 Alcohols Benzoate; an antiperspirant active ingredient comprising ten to thirty percent by weight of said product and suspended in particulate form in said vehicle, said ingredient selected from the group consisting of aluminum zirconium chlorohydrate, aluminum chlorohydrate, and polyhydroxy complexes of basic aluminum salts such as aluminum sesquichlorohydrate, aluminum dichlorohydrate, aluminum zirconium trichlorohydrate, aluminum zirconium tetrachlorohydrate, aluminum zirconium pentachlorohydrate and aluminum zirconium octachlorohydrate; a gelling agent comprising fiteen by twenty percent by weight of said product for emulsifying said product to a free standing form and selected from the group consisting of hydrogenated castor oil, fatty alcohols such as stearyl alcohol, Stearamide MEA, polyethylene vinyl acetate copolymers, polyethylene homopoly erε, and blends and combinations thereof; and a substantially nonvolatile masking agent comprising five to nine percent by weight of said product, said masking agent being selected from the group consisting of hydrogenated polyisobutene and PPG-14 Butanediol, and being interactive with said active ingredient in a manner to mask whitening without substantially inhibiting the antiperspirant activity of said active ingredient when said product is applied to the skin. 23. The product of claim 22 wherein said masking agent is present in an amount that is twenty to forty percent by weight of said active ingredient. 24. The product of claim 22 wherein said masking and said antiperspirant active ingredient interact to provide antiperspirant efficacy of at least eighty percent of commercially available solid antiperspirant products (as measured clinically by gravimetric means) . 25. The product of claim 22 further including supplemental emollient material ranging from about one to ten percent by weight of said product and selected from PPG- 14 Butyl Ether, dioctyl cyclohexane, dimethicone, C 12 _ 15 Alcohol Benzoates, diisopropyl sebacate, diisopropyl adipate, and blends and combinations thereof/ 26. The product of claim 22 wherein at least ninety percent of said antiperspirant active particles are of about ten microns or less in size. 27. The product of claim 26 wherein said masking agent is present in an amount that is twenty to forty percent by weight of said active ingredient, and said masking and said antiperspirant active ingredient interact to provide antiperspirant efficacy of at least eighty percent of commercially available solid antiperspirant products (as measured clinically by gravimetric means) . 28. The product of claim 27 wherein said masking agent includes a water soluble alkoxylated alcohol and provides antiperspirant efficacy that is unsurpassed by commercially available solid antiperspirant products (as measured clinically by gravimetric means) .

Inventors: COE CRAIG MICHAEL, KARASSIK NANCY MARIE, COE, CRAIG, MICHAEL, KARASSIK, NANCY, MARIE
Applicants: GILLETTE CO, THE GILLETTE COMPANY
Application year: 1990
Main classification: A61K7
IPC codes: A61K8, A61Q15