Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2001-03-05
2002-05-07
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S066000, C424S068000, C424S400000, C424S401000
Reexamination Certificate
active
06383476
ABSTRACT:
The present invention relates to anhydrous antiperspirant and deodorant compositions that contain an antiperspirant or deodorant active, and a solid, water-soluble skin active agent other than the antiperspirant or deodorant active. The compositions provide improved delivery of the water-soluble skin active agent to the skin.
BACKGROUND OF THE INVENTION
Many different antiperspirant and deodorant products are known for use in controlling underarm perspiration and malodor. These products are available in a variety of product forms such as solid sticks, soft solids or creams, roll-on liquids and aerosol or non-aerosol sprays. All of these different products, however, are similar in that they generally have a base formula that contains an antiperspirant active such as an aluminum and or zirconium salt, a suspending or thickening agent, and a suitable liquid carrier.
Antiperspirant and deodorant products typically contain only one skin active ingredient, that ingredient being the antiperspirant and deodorant active. There has been limited disclosure in the literature directed to the addition of other skin active agents to these products to provide the underarm area of the skin with more benefits than mere antiperspirant and deodorant benefits. These disclosures have very recently been directed to the addition of various vitamins to the antiperspirant and deodorant products to provide the underarm area of the skin with benefits associated with such topical vitamin application. Such disclosures have included the topical application of water-soluble vitamins such as ascorbic acid and any of the several Vitamin B materials.
Formulating such other skin active agents into an antiperspirant and deodorant product raises a number of challenges, especially when such products contain water-soluble soluble skin active agents. These water-soluble materials can be formulated as a dissolved active in an aqueous antiperspirant and deodorant formulation, but these aqueous formulations tend to provide less antiperspirant efficacy than similar other anhydrous formulations and leave a wet residue after application that many consumers find undesirable. To avoid these problems commonly associated with aqueous antiperspirant and deodorant formulations, these same products can be formulated as anhydrous products containing the water-soluble skin active agent in the form of dispersed particulate solids. These anhydrous antiperspirant and deodorant products tend to provide better antiperspirant efficacy and application cosmetics.
It has now been found that anhydrous antiperspirant and deodorant products containing solid, water-soluble, skin active materials often provide poor delivery of the water-soluble solid from an anhydrous matrix to the underarm area of the skin. It has also been found that this delivery of such water-soluble solids can be improved by formulating the liquid carrier in the anhydrous product matrix such that the matrix is substantially free of organic liquids having a C Log P value of greater than about 7.0. It is believed that this particular selection of the anhydrous liquid carrier allows for improved dissolution of the water-soluble solid into sweat or other moisture on the skin, which then allows for more effective contact of the water-soluble material with the skin, thus improving the efficacy of the water-soluble material on the underarm area of the skin.
SUMMARY OF THE INVENTION
The present invention is directed to anhydrous antiperspirant and deodorant compositions that comprise from about 0.1% to about 30% by weight of an antiperspirant or deodorant active; from about 0.1% to about 20% by weight of a solid, water-soluble, skin active agent other than the antiperspirant or deodorant active; from about 0.1% to about 40% by weight of a suspending agent; and from about 10% to about 99% by weight of an anhydrous carrier liquid, wherein the composition is substantially free of nonvolatile organic liquids having a C log P value greater than about 7.0.
It has been found that the anhydrous compositions of the present invention allow the solid, water-soluble, skin active agent to release into the sweat or other moisture on the skin more rapidly or to a greater extent, thus enhancing any skin active effect resulting from such active materials contacting the skin. These anhydrous compositions are especially effective when the solid, water-soluble, skin active agent comprises a solid, water-soluble vitamin to provide the skin with skin benefits such as reduced skin wrinkles or other skin imperfections, and or smoother and healthier looking underarm skin.
DETAILED DESCRIPTION OF THE INVENTION
The anhydrous antiperspirant and deodorant compositions of the present invention comprise as essential components an antiperspirant or deodorant active, a water-soluble particulate other than the antiperspirant or deodorant active, a suspending agent, and an anhydrous liquid that is substantially free of certain defined organic nonvolatile liquids. Each of these essential components of the present invention is described in detail hereinafter.
The term “anhydrous” as used herein means that the antiperspirant and deodorant compositions of the present invention, and the essential or optional components thereof, are substantially free of added or free water. From a formulation standpoint, this means that the anhydrous antiperspirant and deodorant compositions of the present invention preferably contain less than about 5%, more preferably less than about 3%, even more preferably less than about 1%, most preferably zero percent, by weight of free or added water, other than the water of hydration typically associated with any particulate solids prior to formulation.
All melting point values referenced herein, unless otherwise specified, are measured and determined according to well known Differential Scanning Calorimetry (DSC) technique. Examples of DSC technique for determining melting point values of various materials are described in U.S. Pat. No. 5,306,514 (Letton et al.), which description is incorporated herein by reference.
The term “ambient conditions” as used herein refers to surrounding conditions under about one (1) atmosphere of pressure, 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 refers to those materials that have a measurable vapor pressure at 25° C. Such vapor pressures will typically range from about 0.01 mmHg to about 6 mmHg, more typically from about 0.02 mmHg to about 1.5 mmHg, and have an average boiling point at one (1) atmosphere of pressure (atm) of less than about 250° C., more typically less than about 235° C. at one (1) atm. Conversely, the term “non volatile” refers to those materials that are not “volatile” as defined herein.
The term “skin temperature” as used herein refers to the temperature of the axilla area of the skin, which is generally at or slightly below a typical body temperature of about 37° C.
The term “water-soluble” as used herein refers to those materials, including the water-soluble skin active agent as described herein, that can be dissolved in deionized water at 37° C. under otherwise ambient conditions to form an aqueous solution containing at least 0.1% by weight of the dissolved material, preferably at least about 0.5% by weight of the dissolved material.
The anhydrous antiperspirant and deodorant 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 additional or optional ingredients, components, or limitations known or otherwise effective for use in such compositions.
All percentages, parts and ratios are by weight of the total composition, unless otherwise specified. All such weights as they pertain to listed ingredients are based on the specific ingredient level and, therefore, do not include solvents, carriers, by-products, filler or other
Scavone Timothy Alan
Schlagheck Benjamin Scott
Dodson Shelley A.
The Procter & Gamble & Company
Winter William J.
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