Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2002-01-10
2002-08-06
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S078020, C424S078080, C424S400000, C424S401000
Reexamination Certificate
active
06428777
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a topical composition which, when applied to the human body, provides an antiperspirant benefit to the user. Particularly, the present invention relates to an antiperspirant composition in solid stick form.
BACKGROUND OF THE INVENTION
Antiperspirant and deodorant products are widely used by people in the world today. Their primary benefit, of course, is their ability to suppress perspiration and/or odors on the body of the user. Since such compositions are generally applied topically to the skin, it is important, when formulating antiperspirant compositions, to make sure that they do not leave an unsightly residue on the skin or clothes (i.e., that they are “non-whitening”) and that they provide good skin feel to the user. A product which leaves a white residue on the skin or clothes, or which feels cold, sticky or slimy when applied to the skin may be purchased once, but, will not be re-purchased by the consumer. In the past, delivering a non-whitening product has been accomplished using mechanical processing means for the composition or through the use of butylene glycols in the formulation. The utility of mechanical processing is limited since high shear mixing can only achieve a certain level of non-whitening on the skin. While butylene glycol is effective as a non-whitening agent, it tends to be sticky and tacky to the touch and, therefore, tends to result in undesirable skin feel properties for compositions which incorporate it.
In the past, bentonite or hectorite clays in combination with a polar activator, such as propylene carbonate or ethanol, have been used in roll-on antiperspirant compositions to provide rheological properties and to decrease formula separation. Generally, however, clays were not used in antiperspirant stick formulations. It has now been found that adding clays and activators to an antiperspirant stick has the unexpected result of producing a stick composition which is non-whitening on the skin while at the same time having good skin feel. Currently antiperspirant sticks use butylene glycol or expensive waxes and ethoxylates to achieve a product which is clear on the skin. In addition to being relatively expensive, all of these raw materials have a sticky feel and high drag on the skin. By using a combination of clay and an activator, an antiperspirant stick can achieve non-whitening on the skin, reduced cost, and a smooth skin feel.
Clay and a polar activator can also be used to incorporate water or a water-based extract or additive into an otherwise anhydrous antiperspirant system. In the past, water or water-based extracts or additives have not been incorporated into antiperspirant sticks because they interact negatively with the antiperspirant active. Thus, when water is added to a conventional antiperspirant stick, the water and active form a precipitate which settles out of the anhydrous system, causing both cosmetic and efficacy problems. The present invention permits the use of water in antiperspirant stick compositions, without these problems, through the use of a clay material. The clay and activator can be used to incorporate water or a water-based extract or additive into an anhydrous system because the water can be combined with the clay before the antiperspirant active is added.
U.S. Pat. No. 5,995,065, Thong et al., issued Sep. 21, 1999, relates to topical antiperspirant compositions which incorporate an anhydrous carrier, an aluminum or aluminum/zirconium antiperspirant active, and a water-soluble calcium salt, such as calcium chloride or calcium citrate. The disclosed examples of liquid antiperspirant compositions (Examples 1-5) contain hectorite clay as a thickener or stabilizer. On the other hand, the solid stick examples (Example 9-12) do not include clay materials. This confirms the general approach in the prior art which uses clays primarily as stabilizers or thickeners in liquid or soft antiperspirant compositions, but not in solid stick antiperspirant compositions. See also U.S. Pat. No. 5,188,823, Shapiro, et al., issued Feb. No. 23, 1993, which discloses combinations of clays plus activators in liquid and cream antiperspirant formulations (see Table I).
U.S. Pat. No. 5,833,964, Linn et al., issued Nov. 10, 1998, describes non-whitening antiperspirant sticks which include an antiperspirant active, a gelling agent, a vehicle for the gelling agent, and a mixture of nonvolatile, nonsilicone emollients together with nonvolatile silicone-based emollients both having a refractive index of at least 1.446. Example A discloses an antiperspirant stick composition which includes many conventional solid stick components, but does not include clay or activator components. The patent further teaches (see column 5, lines 43-50) that clay may be used as an inert filler although none of the examples in the patent include clay. See also U.S. Pat. No. 5,972,319, Linn et al., issued Oct. 26, 1999.
U.S. Pat. No. 4,775,528, Callaghan et al., issued Oct. 4, 1988, describes an improved antiperspirant active which comprises a complex of a zirconium hydroxychloride and aluminum chlorhydroxide. Formula II (see column 7) describes an antiperspirant stick composition, which is anhydrous and includes a bentone clay gel. Further, Formula I of the patent discloses a nonaqueous roll-on antiperspirant composition which includes quaternium-18 hectorite clay.
U.S. Pat. No. 5,843,414, Hilvert, et al., issued Dec. 1, 1998, describes antiperspirant compositions in cream (not solid stick) form which are said to have a dry feel on the skin. The compositions include a material selected from bentonite clays, hectorite clays, colloidal silica, talc, microthene, and mixtures thereof.
SUMMARY OF THE INVENTION
The present invention relates to antiperspirant solid stick compositions which comprise:
(a) from about 5% to about 35% of a particulate antiperspirant active;
(b) from about 10% to about 60% of a volatile solvent, such as cyclomethicone D5 (decamethylcyclopentasiloxane);
(c) from about 5% to about 30% of a structurant selected from waxes, and mixtures of waxes having a melting point of at least about 40° C., such as fatty C
14
-C
40
alcohols, stearyl alcohol, hydrogenated castor oil, hydrogenated vegetable oil, and polyethylene;
(d) from about 0.5% to about 7% of a clay, such as bentonites, hectorites, montmorillonites, colloidal aluminum silicates, and mixtures thereof (such as quaternium-18 hectorite);
(e) from about 0.2% to about 1.5% of an activator for said clay (such as ethanol); and
(f) from about 0.5% to about 8% water.
These compositions not only provide effective antiperspirant performance to the user in an aesthetically acceptable solid stick formulation, but also minimize the amount of skin whitening and provide acceptable skin feel to the user. In addition, from a formulational point of view, the antiperspirant sticks of the present invention allow for the incorporation of water or water-based components into an otherwise anhydrous antiperspirant system, without resulting in the deactivation of the antiperspirant active material.
All percents and ratios given herein are “by weight” unless otherwise specified.
All patents and publications noted in this application are incorporated herein by reference.
DETAILED DESCRIPTION OF THE INVENTION
The antiperspirant solid stick compositions of the present invention include a particulate antiperspirant active, a volatile solvent, a structurant, a clay material, a polar activator for the clay, and water, and may optionally contain additional components conventionally found in topical stick-form antiperspirant compositions. Each of those components, as well as the method of making and using the compositions of the present invention, will be discussed in detail below.
As used herein, the term “solid stick” is intended to encompass compositions which typically have penetration force values above about 500 grams, generally above about 1000 grams, as measured at 27° C., 15% relative humidity, using conventional devices, for example a TA-XT2 texture analyzer, manufac
Boyle Kristin Ann
Murphy C. Shawn
Andrew Jergens Company
Dodson Shelley A.
Frost Brown Todd LLC
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