Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2000-12-12
2003-04-29
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S066000, C424S068000, C424S400000, C424S401000
Reexamination Certificate
active
06555099
ABSTRACT:
FIELD OF INVENTION
The present invention relates to single-phase antiperspirant compositions, which contain solubilized antiperspirant active, volatile silicone and selected coupling agents. These compositions are especially useful in providing low-residue performance in combination with improved cosmetics.
BACKGROUND OF THE INVENTION
Clear or translucent antiperspirant compositions have become increasingly popular among consumers over the past several years. These products are especially popular in that they leave little or no visible residue during and after application to the underarm. These clear or translucent products are most typically formulated as solid sticks or soft gels and contain antiperspirant active that is solubilized in a polar solvent (e.g., water, propylene glycol, ethanol) and suspended in a suitable gellant.
These clear or translucent antiperspirant compositions containing solubilized antiperspirant active, however, tend to deliver poor skin cosmetics and relatively low antiperspirant efficacy. Although these compositions also tend to leave little or no visible residue during and after application, the clear or translucent layer remaining on the skin after application is often sticky or wet-feeling, and to many people is unacceptably irritating to the skin. In addition to poor skin cosmetics, these compositions typically provide less antiperspirant efficacy than other antiperspirant product forms such as anhydrous antiperspirant solids and semi-solids containing solid or undissolved antiperspirant active.
Attempts have been made to reformulate these clear or translucent antiperspirant products containing solubilized antiperspirant active to control skin irritation and improve antiperspirant efficacy and skin cosmetics, wherein the reformulated products contain skin friendly materials such as silicone oils, especially volatile silicone oils such as cyclopentasiloxane. For example, U.S. Pat. No. 6,083,493 (Swaile) and U.S. Pat. No. 5,968,489 (Swaile et al) disclose clear or translucent antiperspirant compositions including single phase systems or solutions, that contain antiperspirant active solubilized in either 1,2-hexandiol or isopropyl glycerol ether, and then coupled with a volatile silicone oil using a dimethiconol coupling agent. These coupled single-phase systems or solutions disclosed by Swaile have a clear or translucent appearance and provide dry application cosmetics, minimal or no skin irritation, and improved antiperspirant efficacy.
It has now been found, however, that dimethiconol-coupled antiperspirant active solutions such as those disclosed by Swaile should be processed at low or ambient temperatures or under similar other conditions to help minimize the undesirable reaction of the dimethiconol coupling agent in solution. It has also been found that these solutions can even be reactive under ambient conditions, whether anhydrous or aqueous, when packaged and stored over prolonged periods of time. It is now believed that the Si—OH functional group on the dimethiconol is responsible for this undesirable reactivity with solubilized antiperspirant active solutions.
It has also been found that these and other clear or translucent antiperspirant compositions containing silicone oils coupled with a solubilized antiperspirant active can be processed at higher temperatures or similar other conditions, and formulated with improved chemical stability after formulation, by selecting a coupling agent that is substantially free of Si—H and Si—OH functional groups and that has a solubility parameter of from about 7 to about 12, wherein the sum of the solubility parameter of the essential components is also from about 9 to about 13.
It has also been found that a clear or translucent antiperspirant composition can be formulated as a single phase system or solution, wherein the system comprises solubilized antiperspirant active, solvent for the antiperspirant active, volatile silicone liquid, and a coupling agent that is substantially free of Si—H and Si—OH functional groups and has a solubility parameter of from about 7 to about 12, and wherein the sum of the solubility parameters of the essential components is from about 9 to about 13. These compositions provide good skin cosmetics (i.e., dry, smooth, non-sticky application), minimal or no skin irritation, minimal or no visible residue during and after application, and improved product stability during high temperature processing and during prolonged storage or shipping.
SUMMARY OF THE INVENTION
The present invention is directed to antiperspirant compositions that are single-phase systems comprising a solubilized antiperspirant active, a volatile silicone and selected coupling materials. These antiperspirant compositions may also comprise a structurant, provided that the composition remains a single phase system. The invention is also directed to a method of controlling malodor and perspiration through the application of the antiperspirant compositions of the present invention.
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, volatile silicone and selected coupling materials. 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, unless otherwise specified, refers to surrounding conditions at about one atmosphere of pressure (1 atm), at about 50% relative humidity, and at about 25° C. 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 0.01mmHg, more typically from about 0.02 mmHg to about 2mmHg, 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
Guskey Gerald John
Luebbe John Paul
Dodson Shelley A.
Oney Jack L.
The Procter & Gamble & Company
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