Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2001-08-10
2002-12-17
Dees, Jose′ G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S065000, C424S068000, C424S066000, C424S078020
Reexamination Certificate
active
06495149
ABSTRACT:
TECHNICAL FIELD
The present invention relates to topical leave-on compositions, including antiperspirant and deodorant compositions, that contain selected acid-stable pantothenic acid derivatives. The selected materials are soothing to the skin, provide for improved application cosmetics, and remain acid-stable when used in acidic topical compositions or those compositions containing aluminum-containing antiperspirant actives or other acidic skin active materials.
BACKGROUND OF THE INVENTION
Pantothenic acid derivatives such as panthenol and similar other materials are commonly used in a variety of chemical forms and derivatives in personal care products intended for topical application to the hair or skin. These materials are well known for use in a variety of hair care products as well as in topical skin care products to provide a smooth, soothing skin feel, and to provide a soothing application to otherwise irritated skin. These materials have also been described for use in antiperspirant and deodorant products, most often as racemic mixtures of the D and L isomeric forms of panthenol or as the pure, biologically active, D isomeric form.
It has now been found, however, that many pantothenic acid derivatives such as panthenol and similar other materials are unstable when formulated into compositions comprising aluminum-containing antiperspirant actives or other acidic materials including organic acids. It has been found that many pantothenic acid derivatives such as panthenol are relatively unstable when formulated into such compositions, or even when formulated into compositions that otherwise have an acidic pH in the range of from about 2.0 to about 5.0. It has been found that these materials often undergo an acid-catalyzed degradation when used in combination with organic acids or other acidic materials such as aluminum-containing antiperspirant actives, especially when the combination is within an aqueous system, to form by-products that readily and undesirably form off-odors as well as small crystals around and throughout the composition. This degradation can occur during formulation and processing, as well as during prolonged product storage, but is most significant when the formulating, processing, or prolonged storage is accompanied by elevated temperatures.
It has also been found that pantothenic acid derivatives can be formulated into compositions having a pH of from about 2.0 to about 5.0, with little or none of the above-described chemical degradation, crystal formation, and off-odor formation, provided that the pantothenic acid derivative is selected to have the chemical formula as defined herein. It has also been found that pantothenic acid derivatives can now be formulated in combination with acidic materials such as organic acids or aluminum-containing antiperspirant actives, without the above-described off-odor development and crystal formation, provided that the pantothenic acid derivatives are also selected to have the chemical formula as defined herein.
It has also been found that the selected pantothenic acid derivatives as described herein also help to soften or condition underarm hair, or underarm hair and skin, and that this softened or conditioned underarm hair, or underarm hair and skin, is much easier to shave. It is believed that the softened or conditioned underarm hair cuts more easily during the shaving process as a result of less drag on the hair or skin now caused by the shaving device.
It is therefore an object of the present invention to provide a topical leave-on composition having a pH of from about 2.0 to about 5.0, within which a pantothenic acid derivative is formulated and remains more acid-stable over prolonged periods of time. It is a further object of the present invention to provide an antiperspirant and deodorant composition that contains an aluminum-containing antiperspirant active, and which contains a pantothenic aced derivative that remains more acid-stable over prolonged periods of time despite concurrent use of an otherwise acid antiperspirant active such as an aluminum-containing active. It is a further object of the present invention to provide a topical leave-on composition that contains an organic acid and a pantothenic acid derivative, wherein the pantothenic acid derivative is selected so that it remains more acid-stable within the composition over prolonged periods.
It is yet a further object of the present invention to provide a method of softening or conditioning underarm hair, and to provide a method of enhancing ease of shaving of underarm through the softening or conditioning of the underarm hair by the topical application of the pantothenic acid derivatives as described herein.
SUMMARY OF THE INVENTION
The present invention is directed to topical leave-on compositions comprising (b) from about 0.01% to about 10% by weight of selected pantothenic acid derivatives having the formula:
wherein R
1
, R
2
and R
3
are independently selected from the group consisting of hydrogen, C2-C20 hydrocarbons, C2-C20 carboxylic acid esters, and combinations thereof, and wherein not more than two of R1, R2 and R3 are hydrogen; and (b) from about 10% to about 99.89% by weight of a liquid carrier, wherein the composition has a pH of from about 2.0 to about 5.0, or otherwise contains an acid material such as an organic acid or an aluminum-containing antiperspirant active.
It has been found that the topical leave-on compositions of the present invention can be formulated to comprise pantothenic acid derivatives that remain more stable in an acidic formulation or within a formulation that otherwise contains organic acids or aluminum-containing antiperspirant actives.
The present invention is also directed to methods of preventing or inhibiting underarm perspiration wetness and odor, and to methods of enhancing the ease of shaving underarm hair by conditioning or softening the underarm hair, or by conditioning the underarm hair and or skin, all through the underarm application of the antiperspirant and deodorant embodiments of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The topical leave-on compositions of the present invention comprise as essential components selected pantothenic acid derivatives, a liquid carrier, and an acidic profile defined by a formulation pH of from about 2.0 to about 5.0 or an acidic profile defined by the concurrent use of acidic materials such as organic acids or aluminum-containing antiperspirant actives. Each of these essential components or features of the compositions of the present invention is described hereinafter in more detail.
The term “anhydrous” as used herein refers to those compositions or materials that contain less than about 15%, more preferably less than about 10%, even more preferably less than about 1%, most preferably zero percent, by weight of water.
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 “leave-on” as used herein refers to the compositions of the present invention and means that such compositions are intended solely for leave-on application to the skin, and therefore specifically excludes rinse-off applications such as shampoos, facial or hand cleansers, or any body wash or cleanser composition. In this context, the topical leave-on compositions of the present invention are preferab
Runtz Lisa Ann
Scavone Timothy Alan
Schlagheck Benjamin Scott
Dees Jose′ G.
Gollamudi Sharmila S
Miller Steven W.
Oney Jack L.
Rosnell Tara M.
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