Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2002-02-19
2004-04-13
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S400000, C424S401000
Reexamination Certificate
active
06719965
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to antiperspirant and deodorant compositions, and more particularly to such compositions comprising a polyol.
BACKGROUND
Typical deodorant and antiperspirant products on the market use aluminium or aluminum-zirconium salts to prevent, or at least control, perspiration at the skin surface, particularly in the underarm, whilst often simultaneously providing a perceived degree of deodorancy.
A principal disadvantage of many antiperspirant and deodorant products is their perceived skin unfriendliness. More particularly, the presence of volatile carriers such as volatile silicones and ethanol, and indeed antiperspirant and deodorant actives is perceived to have a drying and tightening effect on the user's skin following application, resulting in dry skin, reduced skin elasticity and an unpleasant skin sensation.
Many antiperspirant and deodorants can also result in a stinging sensation on the skin following application due to the presence of astringent, skin drying materials such as ethanol and the aluminum and aluminum-zirconium underarm salts. Stinging is particularly problematic when an antiperspirant or deodorant is applied following shaving.
In order to overcome these disadvantages, moisturising creams have been incorporated into antiperspirant and deodorant compositions. For example, U.S. Pat. Nos. 5,932,199, 6,099,827, and 6,221,345 disclose antiperspirant compositions comprising moisturising cream.
Moisterising creams typically comprise numerous components such as glycerin. However, the incorporation of materials like glycerin into antiperspirant and deodorant formulations cause progressively greater difficulties as their proportion increases. Incorporation of materials like glycerin into antiperspirant and deodorant formulations requires the use of additional materials to aid in the processing. These additional materials, though, adversely affect the aesthetics of the formulation as well as other physical properties. One of the more significant problems comprises the potential of grit formation during the manufacture of the formulation, which noticeably can impair the sensory properties of the formulation. This is particularly apparent for skin which has been sensitised, for example by shaving.
Accordingly, it is an object of the present invention to provide an antiperspirant and/or deodorant composition containing a polyol that has excellent aesthetic properties.
It is a further object of the present invention to provide an antiperspirant and/or deodorant composition containing a polyol that does not require the use of additional processing materials.
It is a further object of the present invention to provide an antiperspirant and/or deodorant composition containing a polyol that does not have gritiness.
It is a further object of the present invention to provide an antiperspirant and/or deodorant composition containing a polyol that has improved thermal stability.
SUMMARY OF THE INVENTION
According to the invention there is provided an antiperspirant or deodorant composition comprising an antiperspirant/deodorant active and a polyol, wherein at least part of the polyol is associated with the antiperspirant/deodorant active prior to mixing with other ingredients of the formulation. Preferably, the polyol is glycerin.
DETAILED DESCRIPTION OF THE INVENTION
In the present invention it has been found that anhydrous suspension antiperspirant and deodorant compositions containing polyol, numerous physical benefits are gained by associating the polyol with the antiperspirant/deodorant active prior to mixing with the other ingredients of the composition. Anhydrous as used herein means compositions containing less than 10% water, and preferably less than 5% water. This water may be complexed with the antiperspirant/deodorant active salt.
The benefits gained as a result of the present invention include being easier to apply, having better glide, dispensing more evenly, feeling lighter, having better absorption, being easier to process, and having improved thermal stability.
Suitable polyols for the present invention are, without limitation, those having from 2 to 8 carbon atoms and from 2 to 8 hydroxyl groups, preferably from 3 to 6 carbons atoms; particularly at least 3 hydroxyl groups, such as from 3 to 6, and especially 3 hydroxyl groups. Specifically, suitable polyols which may be useful for the present invention include, without limitation, polyhydric aliphatic alcohols, glycerol, pentaerythritol, sorbitol, xylitol, dulcitol, mannitol, mesoerythritol, butanetriol, trimethylolpropane, adonitol, arabitol, threitol, inositol, scyllitol, iditol, 2,5-anhydro-D-mannitol, 1,6-anhydro-glucose, and hexanetriol. Preferably, the polyol is glycerin.
Preferably, the polyol associated with the antiperspirant/deodorant active is present at 0.5-20% by weight of the underarm salt composition. More preferably, the polyol associated with the underarm salt active is present at 3-12% by weight of the salt composition and even more preferably present at 6-10% by weight of the salt composition.
Furthermore, it is preferable, in antiperspirant/deodorant compositions in accordance with the present invention, for the total polyol level (of which is at least part of is associated with the antiperspirant/deodorant active prior to mixing the active with the other components) is present at 0.12-5% by weight of the antiperspirant/deodorant composition. More preferably, the total polyol level in the antiperspirant/deodorant composition is 0.75-3% by weight of the antiperspirant/deodorant composition and even more preferably present at 1.5-2.5% by weight of the antiperspirant/deodorant composition.
The particulate antiperspirant/deodorant active may be an astringent salt or an anti-microbial agent. The astringent salts may be inorganic or organic salts of aluminum, zirconium, zinc and mixtures thereof. Salts useful as astringents or as components of astringent aluminum complexes include aluminum halides, aluminum hydroxyhalides, zirconyl oxyhalides, zirconyl hydroxyhalides and mixtures of these salt materials.
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 2 to 5 and x+y=6 and x and y do not need to be integers; and where X is about 1 to 6.
Several types of complexes utilizing the above astringent salts are known in the art. For example, U.S. Pat. No. 3,792,068 (Luedders et al.), discloses complexes of aluminum, zirconium and amino acids such as glycine. Complexes reported therein and similar structures are commonly known as ZAG. The ZAG complexes ordinarily have an Al:Zr ratio of from about 1.67 to 12.5 and a Metal:Cl ratio of from about 0.73 to 1.93. The preferred amino acid for preparing such ZAG-type complexes is glycine of the formula CH
2
(NH
2
)COOH. Spherical ZAG, with particle size 1 to 100 microns, is especially preferred.
More specifically, the following is a list of antiperspirant actives which may be useful for the present invention and which have approved listings under the United States Food & Drug Administration, Federal Register. They include aluminum chloride, aluminum chlorohydrate, aluminum chlorohydrex, aluminum chlorohydrex PEG, aluminum chlorohydrex PG, aluminum dichlorohydrate, aluminum dichlorohydrex PEG, aluminum dichlorohydrex PG, aluminum sesquichlorohydrate, aluminum sesquichlorohydrex PEG, aluminum sesquichlorohydrex PG, aluminum sulfate, aluminum zirconium octachlorohydrate, aluminum zirconium octachlorohydrex GLY, aluminum zirconium pentachlorohydrate, aluminum zirconium pentachlorohydrex GLY, aluminum zirconium tetrachlorohydrate, aluminum zirconium trichlorohydrate, aluminum zirconium tetrachlorohydrate GLY, and aluminum zirconium trichlorohydrate GLY.
Amounts of the active astringent salt may range from about 1 to about 40%, preferably from about 10 to about 35%, optimally from about 15 to about 30% by weight of the composition.
The antiperspirant salts are employed herein in
Dodson Shelley A.
Stein Kevin J.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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