Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2001-04-27
2002-06-11
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S066000, C424S068000, C424S400000, C424S401000
Reexamination Certificate
active
06403072
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to anhydrous antiperspirant and deodorant compositions that contain an antiperspirant or deodorant active, a solid water-soluble skin active agent other than and in addition to the antiperspirant or deodorant active, and glycerin. The compositions provide an improved low residue performance and skin feel.
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 antiperspirant and deodorant art 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 limited disclosures have 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 many of the water-soluble Vitamin B materials.
Formulating skin active agents into an antiperspirant and deodorant product raises a number of challenges, especially when such products contain water-soluble skin active agents. These water-soluble materials can be formulated as a dissolved active in an aqueous antiperspirant and deodorant formulation, but 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 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 water-soluble solids can be improved by formulating the liquid carrier in the anhydrous product matrix such that the matrix is preferably and free or 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.
It has also been found, however, that the above described formulations that contain such water-soluble solids other than and in addition to the antiperspirant and deodorant actives can also result in a relatively high visible residue on the skin after application. The relatively high residue is believed to be from the water-soluble solids in the formulation that have relatively high refractive indices. It has now been found that this relatively high visible residue can be reduced substantially by using small concentrations of glycerin in the formulation. It was also found that the glycerin helps with active dispersion during processing, thus allowing for a process with less reliance upon lengthy mechanical dispersion steps. It was also found that the glycerin not only reduces visible residue, but that it provides this particular formulation with a dry, silky feeling during and after application to the underarm.
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; from about 0.1% to about 2.0% by weight of glycerin; and from about 10% to about 99% by weight of an anhydrous carrier liquid other than glycerin.
It has been found that anhydrous antiperspirant and deodorant compositions containing water-soluble solids other than and in addition to the antiperspirant and deodorant actives also result in a relatively high visible residue when applied to the skin. The relatively high residue is believed to be from water-soluble solids in the formulation, especially those solids such as niacinamide and other vitamin B solids that have relatively high refractive indices. It has now been found that this relatively high visible residue can be reduced substantially by using small concentrations of glycerin in the formulation. It has also been found that the glycerin not only reduces visible residue, but also provides this particular formulation with a dry, silky feeling during and after application to the underarm.
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 in addition to and other than the antiperspirant or deodorant active, a suspending agent, low concentrations of glycerin; and an anhydrous liquid other than and in addition to the glycerin. 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. Converse the term “non volatile” refers to those materials that are not “volatile” as defined herein.
The term “skin temperature” as used herei
Cassiere Kelly Lynn
Scavone Timothy Alan
Schlagheck Benjamin Scott
Dodson Shelley A.
The Procter & Gamble & Company
Winter William J.
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