Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2002-03-14
2002-12-03
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S066000, C424S067000, C424S068000, C424S078020, C424S078310, C424S400000, C424S401000, C424SDIG001
Reexamination Certificate
active
06488919
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 semi-solid form, such as a soft solid, gel or cream.
BACKGROUND OF THE INVENTION
Antiperspirant and deodorant products are widely used throughout 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 irritate the skin, 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 generally be re-purchased by the consumer. In the past, formulating a non-whitening product has been accomplished using mechanical processing means for the composition or through the use of butylene glycol in the composition. 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 the compositions which incorporate it.
In the past, water or water-based extracts or additives have not been incorporated into antiperspirant compositions because they interact negatively with the antiperspirant active. Thus, when water is added to a conventional antiperspirant composition, 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 an antiperspirant semi-solid composition, as well as allowing the formulation of these compositions such that they are non-whitening on the skin while at the same time having good skin feel, through the incorporation of an ester wax material.
U.S. Pat. No. 4,937,069, Shin, issued Jun. 26, 1990, describes a substantially anhydrous semi-solid antiperspirant composition consisting essentially of 1-50% of an antiperspirant active powder; 2-6% of a fumed silica thickening/suspending agent (such as Cab-O-Sil®); 2-6% of a thickening/solid emollient (such as stearyl alcohol or hydrogenated castor oil); 2-15% of a nonvolatile liquid emollient/plasticizer (such as PEG-100 stearate, glyceryl stearate or PEG-20 sorbitan isostearate); and 30-70% of a volatile emollient (such as cyclomethicone). Water or water-based components are not incorporated into the disclosed compositions.
U.S. Pat. No. 5,756,082, Cashin, et al., issued May 26, 1998, relates to cosmetic sticks (which are defined to include soft solid antiperspirant compositions) comprising 24-60% of a volatile silicone (such as cyclomethicone), 3-25% of a wax (such as stearyl alcohol or hydrogenated castor oil), and 10-40% of a gel component which comprises mineral oil or (butylene or propylene)/ethylene/styrene copolymers. Disclosed compositions include very low levels of PEG-25 propylene glycol stearate (0.15%) and water (0.5%).
International Patent Application WO 99/51192, Colgate-Palmolive Company, published Oct. 14, 1999, relates to low residue cosmetic compositions (for example, antiperspirant compositions) which include an active ingredient, a silicone gel material comprising an elastomer composition, and at least one surfactant having an HLB value of from 8-16. Emollients such as PEG-25, PEG stearate, glyceryl stearate, and PEG-100 stearate may be included in the disclosed compositions. The compositions are taught to exhibit reduced or eliminated film formation when applied to the skin, together with increased availability of the active ingredient.
SUMMARY OF THE INVENTION
The present invention relates to semi-solid antiperspirant 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 2% to about 15% of a thickening agent, for example a solid emollient material such as stearyl alcohol or hydrogenated castor oil;
(d) from about 1% to about 10% of an ester wax, such as ester waxes having a total carbon content of from about 12 to about 40 carbons (examples include glyceryl stearate and sorbitan isostearate); and
(e) from about 0.5% to about 10% of water or a water-containing component, such as a water-based botanical extract (e.g., ginger extract).
These compositions not only provide effective antiperspirant performance to the user in an aesthetically acceptable semi-solid formulation (such as a soft solid composition, a gel or a cream), 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 compositions of the present invention allow for the incorporation of water or water-based components (such as botanical extracts) into an otherwise anhydrous antiperspirant system, without resulting in the deactivation of the antiperspirant active material.
All percentages 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 semi-solid antiperspirant compositions of the present invention include a particulate antiperspirant active, a volatile solvent, a thickening agent component, an ester wax and water, and may optionally contain additional components conventionally found in topical antiperspirant compositions. Each of those components, as well as the methods of making and using the compositions of the present invention, will be discussed in detail below.
As used herein, the term “semi-solid composition” is intended to encompass compositions which typically have a penetration force value of at least about 100 grams, as measured at 27° C., 15% relative humidity, using conventional devices, for example a TA-XT2 texture analyzer, manufactured by Text Technology Corp., Scarsdale, N.Y. The penetration force value is not so high as to define a solid composition. Examples of semi-solid compositions include soft solid sticks, gels, and creams. The viscosities of the semi-solid compositions lie between those of liquids (on the low end) and solid sticks (on the high end).
The present composition contains from about 5% to about 35%, preferably from about 15% to about 26%, by weight of a particulate antiperspirant material. These weight percentages are calculated on an anhydrous metal salt basis (exclusive of glycine, the salts of glycine, or other complexing agents). The particulate antiperspirant material preferably has a particle size ranging about 1 to about 100 microns, more preferably from about 1 to about 50 microns. They may be impalpable or microspherical in form and, preferably, have a high bulk density (for example, greater than about 0.7 g/cm
3
). Any particulate antiperspirant materials known in the art may be used in the present invention. Such materials include, for example, many aluminum or zirconium astringent salts or complexes. Examples of useful antiperspirant materials are described in U.S. Pat. No. 6,287,544, Franklin, et al., issued Sep. 11, 2001; U.S. Pat. No. 6,261,543, Fletcher, et al., issued Jul. 17, 2001; and U.S. Pat. No. 6,187,301, Scavone, et al., issued Feb. 13, 2001; all incorporated herein by reference.
Aluminum salts of this type include aluminum chloride and the aluminum hydroxyhalides having the general formula Al
2
(OH)
x
Q
y
.XH
2
O where Q is chlorine, bromine or iodine; where x is from about 2 to about 5, and x+y=about 6, and x and y do not need to be integers; and where X is from about 1 to abo
Boyle Kristin Ann
Murphy C. Shawn
Dodson Shelley A.
Frost Brown Todd LLC
The Andrew Jergens Company
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