Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2001-05-23
2002-11-26
Pryor, Alton (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S400000, C424S401000
Reexamination Certificate
active
06485715
ABSTRACT:
TECHNICAL FIELD
The present invention relates to pressurized antiperspirant compositions comprising solubilized antiperspirant active, a dimethylether propellant, and a low polarity solvent. The compositions can be formulated as stable single phase or clear pressurized liquids without reliance upon ethanol, propylene glycol, or aqueous solvents.
BACKGROUND OF THE INVENTION
There are many different pressurized antiperspirant formulations known for use in controlling or inhibiting underarm perspiration and odor. Most of these formulations comprise an antiperspirant powder such as an aluminum salt, which is suspended in an anhydrous carrier and combined with a liquefied volatile propellant in a pressurized container. The formulation is then applied to the underarm as a pressurized spray which is, generated by the rapid boiling of the propellant upon dispensing from an atomizing valve in association with the pressurized container.
Although many consumers enjoy the convenience of an aerosol antiperspirant, many of these aerosols have highly undesirable application cosmetics. Activation of these aerosols often results in a dusty or powdery application, which then results in a heavy white residue on the applied areas of the skin. Moreover, the powdery residue on the skin tends to flake away or otherwise fall off relatively easily after application, especially when the applied surface comes in contact with clothing, thus resulting in an undesirable residue on the clothing itself and a loss or reduction of antiperspirant coverage on those areas of the skin from which the product has flaked away or otherwise fallen off.
To improve application cosmetics, some aerosol antiperspirants have been formulated with antiperspirant active dissolved or solubilized in a suitable aqueous or anhydrous carrier. Many of these formulations are also single phase systems without any dispersed or suspended solids, thus resulting in little or no visible residue on the applied areas that is attributable to the deposition of such dispersed or suspended solids on the skin. These single phase formulations often have a clear or translucent appearance, and apply neatly from an aerosolized spray without a dusty or powdery application. Many of these single phase aerosols, however, contain ethanol, or water to help solubilize the antiperspirant active to allow for the formulation of a stable, single-phase system. The aqueous formulations tend to feel wet during application and the ethanol formulations tend to irritate or sting the sensitive underarm area of the skin during and after application.
Single phase antiperspirant aerosols have also been described in the antiperspirant art in which single phase aerosols are formulated with dimethylether, solubilized antiperspirant active, and polyol solvents such as propylene glycol. These compositions contain dimethylether which allows for the formulation of a stable single-phase system, provided that the system also contains water, ethanol or relatively high propylene glycol concentrations to maintain the stability of the single phase system. Such compositions, however, tend to be unstable when formulated with substantive low polarity solvents, thus resulting in precipitation of antiperspirant active from solution or phase separation shortly after formulation, unless the compositions are modified to contain relatively high ethanol, water or propylene glycol concentrations. As noted throughout the antiperspirant art, high ethanol or propylene glycol concentrations can irritate or sting the sensitive underarm area of the skin and high water concentrations can result in an undesirably wet skin feel during and after application.
It has now been found that pressurized antiperspirant products can be formulated as single phase or clear products, without reliance upon high ethanol, propylene glycol, or water concentrations to solubilize and couple antiperspirant active with the various other ingredients to form a single phase or clear system. It has been found that single-phase, pressurized antiperspirants can be prepared without reliance upon such materials provided that it comprises an antiperspirant active solubilized in a polyol solvent having at least 4 carbon atoms and a hydroxyl group on each of the &agr; and &bgr; carbon atoms of the polyol solvent, wherein the solubilized active and selected polyol solvent are combined with a dimethylether propellant in combination with a low polarity solvent having a solubility parameter of less than about 8.0, wherein the weight ratio of the dimethylether to the low polarity solvent is from about 0.1 to about 3.0.
It has been found that the pressurized single-phase antiperspirant product will remain stable over prolonged periods, provided that the defined polyol solvent and dimethylether propellant are coupled with the low polarity solvent, and provided that the weight ratio of the dimethylether propellant to low polarity solvent is maintained within the range as defined here.
It has also been found that the above-described pressurized antiperspirant products remain stable over prolonged periods of time, and can be formulated as clear or single phase systems with low polarity solvents or materials. These low polarity solvents or materials can include materials such as volatile or non-volatile silicone fluids that provide additional benefits such as active substantivity, emolliency, improved skin feel during or after application, formulation flexibility, and similar other benefits. These low polarity solvents also include liquefied hydrocarbon propellants to provide a low cost option to more expensive propellant materials.
SUMMARY OF THE INVENTION
The present invention is directed to pressurized anhydrous antiperspirant compositions comprising: (a) a polyol solvent having at least 4 carbon atoms and a hydroxyl group on each of the &agr; and &bgr; carbon atoms of the polyol solvent; (b) solubilized antiperspirant active; (c) dimethylether; (d) a low polarity liquid having a solubility parameter of less than about 8.0, wherein the weight ratio of the dimethylether to low polarity solvent is from about 0.1 to about 3.0.
It has been found that these compositions are especially useful in formulating clear or single-phase pressurized antiperspirant compositions that remain stable over prolonged periods and that can be formulated without high concentrations of ethanol, propylene glycol or aqueous solvents. It has also been found that these compositions can be maintained as single phase or clear formulations, even when formulated with low polarity solvents such as silicone oils, liquefied hydrocarbon propellants, and other similar materials.
DETAILED DESCRIPTION OF THE INVENTION
The pressurized antiperspirant compositions of the present invention comprise a selected polyol solvent, a solubilized antiperspirant active, a dimethylether propellant, and a low polarity solvent in a defined weight ratio relative to the dimethylether propellant. These and other essential elements or limitations of the pressurized antiperspirant compositions of the present invention are described in detail hereinafter.
The term “anhydrous” as used herein, unless otherwise specified, refers to those compositions or materials containing less than about 5%, more preferably less than about 3%, even more preferably less than about 1%, even more preferably zero percent, by weight of free or added water.
The term “ambient conditions” as used herein refers to surrounding conditions at about one atmosphere of pressure, at about 50% relative humidity, and at about 25° C.
The term “pressurized antiperspirant” as used herein means any packaged antiperspirant composition that is pressurized from a gas or liquefied gas propellant to thus provide a means for pushing or moving the antiperspirant composition through an application device.
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-pr
Hilvert Jennifer Elaine
Smith Scott Edward
Swaile David Frederick
Miller Steven W.
Oney Jack L.
Pryor Alton
Rosnell Tara M.
The Proctor & Gamble Company
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