Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2000-12-12
2003-02-25
Dees, Jose' G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S066000, C424S068000, C424S400000, C424S401000
Reexamination Certificate
active
06524562
ABSTRACT:
FIELD OF INVENTION
The present invention relates to antiperspirant compositions, which contain solubilized antiperspirant active, silicone elastomer and a volatile silicone. These compositions are especially useful in providing low-residue performance in combination with improved cosmetics.
BACKGROUND OF THE INVENTION
There are many types of topical antiperspirant products that are commercially available or otherwise known in the antiperspirant art. These products are formulated in a variety of solid, semi-solid and liquid product forms, many of which are also formulated with an emphasis on low-residue performance. In this context, low-residue performance means that the product is applied to the skin with minimal or no visible residue on the applied area. Many of these low-residue products are formulated with solubilized rather than solid antiperspirant active to further improve their low-residue performance. It is well known that the use of solid antiperspirant active in an antiperspirant product can contribute to the appearance of a white, chalky residue when applied to the axilla or other area of the skin.
Although topical products containing solubilized antiperspirant active can provide low-residue performance, they often deliver less desirable cosmetics, e.g., sticky skin feel, and are often more irritating to the skin than many other antiperspirant products containing solid antiperspirant active.
It has now been found that antiperspirant compositions containing solubilized antiperspirant active can be formulated to provide low-residue performance, minimal skin irritation, and good skin cosmetics, provided that such compositions are single-phase systems that also contain a silicone gel material comprising a volatile silicone and a silicone elastomer.
Although silicone elastomers are known for use in antiperspirant compositions, they are typically used in combination with solid rather than solubilized antiperspirant active or they are used in multi-phase emulsions. Moreover, the silicone elastomer compositions disclosed in the antiperspirant art which contain solid antiperspirant active are often associated with higher visible residue after application, and the multi-phase silicone elastomer compositions described in the antiperspirant art have the stability problems commonly associated with multi-phase systems, especially multi-phase emulsions. It has now been found, therefore, that silicone elastomers can be used in combination with solubilized antiperspirant active to deliver low-residue performance and good skin cosmetics, all from a single-phase rather than a multi-phase system.
SUMMARY OF THE INVENTION
The present invention is directed to antiperspirant compositions that are single-phase systems comprising a solubilized antiperspirant active, a silicone elastomer and a volatile silicone. These antiperspirant compositions may also comprise a structurant. The invention is also directed to a method of controlling malodor and perspiration through the application of the antiperspirant composition. The compositions and corresponding methods of the present invention provide improved low residue performance, product stability, antiperspirant efficacy, skin feel performance and/or aesthetics.
DETAILED DESCRIPTION
The antiperspirant compositions of the present invention are single-phase systems that comprise solubilized antiperspirant active, solvent for the antiperspirant active, silicone elastomer, and a volatile silicone. Each of these essential elements is described in detail hereinafter.
The term “single-phase system”, as used herein, refers to the antiperspirant compositions of the present invention, wherein all of these compositions are in the form of a solution or microemulsion. In this context, the term “microemulsion” is an art-recognized term that refers to systems other than solutions that behave thermodynamically as a single-phase, i.e., single-phase systems have a single melting temperature, a single refractive index, a single viscosity, and do not readily phase separate.
The term “ambient conditions” as used herein refers to surrounding conditions at about one atmosphere of pressure (1 atm), at about 50% relative humidity, and at about 25° C., unless otherwise specified. All values, amounts and measurements described herein are obtained under ambient conditions, unless otherwise specified.
The term “volatile”, as used herein, unless otherwise specified refers to those materials that are liquid under ambient conditions and which have a measurable vapor pressure at 25° C. These materials typically have a vapor pressure greater than about 0.01 mmHg, more typically from about 0.02 mmHg to about 20 mmHg, and an average boiling point typically less than about 250° C., more typically less than about 235° C.
All percentages, parts and ratios as used herein are by weight of the total composition, unless otherwise specified. All such weights as they pertain to listed ingredients are based on the active level and, therefore, do not include solvents or by-products that may be included in commercially available materials, unless otherwise specified.
The antiperspirant compositions of the present invention can comprise, consist of, or consist essentially of the essential elements and limitations of the invention described herein, as well as any of the additional or optional ingredients, components, or limitations described herein.
Solubilized Antiperspirant Active
The antiperspirant compositions of the present invention comprise an antiperspirant active suitable for topical application to the skin. The antiperspirant active can be any known or otherwise effective antiperspirant active, provided that the antiperspirant active is solubilized in the composition. The concentration of solubilized antiperspirant active in the composition should be sufficient to provide the desired perspiration wetness and odor control, which will typically range from about 0.1% to about 26%, preferably from about 0.5% to about 20%, more preferably from about 6% to about 20%, by weight of the composition. All such weight percentages are calculated on an anhydrous metal salt basis exclusive of water and any complexing agents such as glycine, glycine salts, or other complexing agents.
Preferred antiperspirant actives for use in the compositions of the present invention include astringent metallic salts, especially the inorganic and organic salts of aluminum, zirconium and zinc, as well as mixtures thereof. Particularly preferred are the aluminum and zirconium salts, such as aluminum halides, aluminum chlorohydrate, aluminum hydroxyhalides, zirconyl oxyhalides, zirconyl hydroxyhalides, and mixtures thereof.
Preferred aluminum salts for use in the antiperspirant compositions include those which conform to the formula:
Al
2
(OH)
a
Cl
b
·x
H
2
O
wherein a is from about 2 to about 5; the sum of a and b is about 6; x is from about 1 to about 6; and wherein a, b, and x may have non-integer values. Particularly preferred are the aluminum chlorohydroxides referred to as “5/6 basic chlorohydroxide”, wherein a=5, and “2/3 basic chlorohydroxide”, wherein a=4. Processes for preparing aluminum salts are described in U.S. Pat. No. 3,887,692 (Gilman, issued Jun. 3, 1975); U.S. Pat. No. 3,904,741 (Jones et. al., issued Sep. 9, 1975) and U.S. Pat. No. 4,359,456 (Gosling et al., issued Nov. 16, 1982), which descriptions are incorporated herein by reference.
Preferred zirconium salts for use in the antiperspirant compositions include those which conform to the formula:
ZrO(OH)
2−a
Cl
a
·x
H
2
O
wherein a is any number having a value of from about 0 to about 2; x is from about 1 to about 7; and wherein a and x may both have non-integer values. Particularly preferred zirconium salts are those complexes which additionally contain aluminum and glycine, commonly known as ZAG complexes. These ZAG complexes contain aluminum chlorohydroxide and zirconyl hydroxy chloride conforming to the above-described formulas. Such ZAG complexes are described in U.S. Pat. No. 3,679,068 (Luedders et al., issued Feb. 12, 19
Dees Jose' G.
Oney Jack L.
The Procter & Gamble & Company
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