High efficacy antiperspirant stick with concentrated elastomer

Details High efficacy antiperspirant stick with concentrated elastomer High efficacy antiperspirant stick with concentrated elastomer

2001-11-09

2003-01-28

Dodson, Shelley A. (Department: 1616)

Drug, bio-affecting and body treating compositions

Anti-perspirants or perspiration deodorants

C424S078020, C424S078080, C424S400000, C424S401000

Reexamination Certificate

active

06511658

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to antiperspirant/deodorant stick products made without stearyl alcohol and which have higher efficacy and better aesthetics than stearyl alcohol gelled sticks.
BACKGROUND OF THE INVENTION
There is a continuing trend to develop new and superior cosmetic compositions especially for the reduction and/or elimination of wetness and/or odor under the arms. Particular efforts include developing lower residue products especially with improved efficacy and aesthetics. Various product forms have included sticks (especially gel/sticks), gels, soft solids, roll-ons, aerosols and creams. Of these various forms the sticks, gels, soft solids creams and roll-ons are made with a liquid base material incorporating a solidifying agent and/or gelling agent and/or thickening agent. Generally, these forms include a solution of the cosmetically active ingredient in a suitable vehicle, a suspension of the active ingredient in a carrier vehicle, or a multiphasic dispersion or emulsion in which a solution of the active ingredient is dispersed or suspended in some continuous phase or in which the solubilized active ingredient constitutes the continuous phase.
One of the most frequently used gelling agents for stick products is stearyl alcohol. While it gives a solid product, it can reduce efficacy of the antiperspirant salt included in the formulation. This invention is a stick made without stearyl alcohol and which has an efficacy that is at least 10% better in sweat reduction than a stick that is gelled with stearyl alcohol.
Thus, it is an object of the invention to provide improved cosmetic compositions with the improvements as previously described and which are useful as antiperspirants and/or deodorants. These and other objects of the invention will be apparent from the following description of the invention.
SUMMARY OF THE INVENTION
It has been found that a high efficacy antiperspirant/deodorant stick product may be made by combining the following ingredients where all amounts are in weight percent based on the total weight of the composition:
(a) 30-70% volatile cyclomethicone (particularly 40-50%) (for example, D4, D5, D6 and mixtures of two or more of the foregoing);
(b) 10-25% of an antiperspirant active;
(c) 1-15% of an emollient (which may also be a mixture of two or more emollients) and which may include a non-volatile silicone (especially wherein the emollient is selected from the group consisting of C12-15 alkyl benzoate; and medium volatility dimethicone (especially 10-350 centistoke material and more especially 10-50 centistoke material);
(d) 1-14% of polyethylene (particularly 3-10%) comprising one or more members selected from the group consisting of homopolymers and copolymers of polyethylene wherein the polyethylene (i) is at least 90% linear; (ii) has a molecular weight in the range of 300-3000 (especially 300-1000 and more especially 300-500); (iii) has a melting point in the range of 50-129 degrees C. (for example, 50-70 degrees C., 60-70 degrees C., and 70-129 degrees C.); and (iv) has a polymer backbone of CH
3
CH
2
—(CH
2
—CH
2
)
n
—CH
2
—CH3 (which can also be represented as CH
3
CH
2
—(CH
2
—CH
2
)
n
—H), where n is an average number and is selected to be in the range of 10-106 (for example, polyethylenes sold under the PERFORMALENE name from New Phase Technology, Piscataway, N.J.);
(e) 0.3-7% of a wax (including a single wax or a combination of waxes) as a co-gellant with the polyethylene wherein the wax has a melting point in the range of 40-97 degrees C (for example, 40-80 degrees C.), and particularly wherein the wax is a member selected from the group consisting of Japan wax substitute 525 (from Ross Wax, Jersey City, N.J.), Beeswax 136 (for example, from Ross Wax); microcrystalline wax having a melting point in the range of 60-97 degrees C.; and
(f) 1-30% (particularly 5-20%) of an elastomer in cyclomethicone composition comprising a cyclomethicone (and) dimethicone crosspolymer made with an ═Si—H containing polysiloxane and an alpha, omega-diene of formula CH
2
═CH(CH
2
)
x
CH═CH
2
, where x=1-20, to form a gel by crosslinking and addition of ═Si—H across double bonds in the alpha, omega diene, which crosspolymer has a viscosity in the range of 50,000-3,000,000 centipoise (particularly 100,000-1,000,000; more particularly 250,000-450,000 centipoise; and most particularly 350,000 centipoise), preferably with a nonvolatiles content of 8-18% (particularly 10-14% and most particularly 12-13%) in cyclomethicone (for example a D4 or D5 cyclomethicone), (an example of such a crosspolymer composition being DC-9040 from Dow Coming Corporation (Midland, Mich.) with other types of such crosspolymers (also called elastomers) being described in U.S. Pat. No. 5,654,362, incorporated by reference herein as to the description of such polymers and methods of making such polymers); provided that the ratio of wax:polyethylene is in the range of 1 :1-1:10, particularly 1:2-1:10, and more particularly in a ratio of 3:8.
Other optional ingredients include 0.1-5% fragrance and an effective amount of an antimicrobial (for example, an antibacterial) agent.
DETAILED DESCRIPTION OF THE INVENTION
Various types of cyclomethicones may be used. Illustratively, and not by way of limitation, the volatile silicones are one or more members selected from the group consisting of cyclic polydimethylsiloxanes such as those represented by Formula I:
where n is an integer with a value of 3-7, particularly 5-6. By volatile silicone material is meant a material that has a measurable vapor pressure at ambient temperature. For example, DC-245 fluid or DC-345 fluid from Dow Coming Corporation (Midland, Mich.) is a type of cyclomethicone which can be used. These include a tetramer (or octylmethylcyclotetrasiloxane) and a pentamer (or decamethylcyclopentasiloxane).
The antiperspirant active can be selected from the group consisting of any of the known antiperspirant active materials. These include, by way of example (and not of a limiting nature), aluminum chlorohydrate, aluminum chloride, aluminum sesquichlorohydrate, zirconyl hydroxychloride, aluminum-zirconium glycine complex (for example, aluminum zirconium trichlorohydrex gly, aluminum zirconium pentachlorohydrex gly, aluminum zirconium tetrachlorohydrex gly and aluminum zirconium octochlorohydrex gly), aluminum chlorohydrex PG, aluminum chlorohydrex PEG, aluminum dichlorohydrex PG, and aluminum dichlorohydrex PEG. The aluminum-containing materials can be commonly referred to as antiperspirant active aluminum salts. Generally, the foregoing metal antiperspirant active materials are antiperspirant active metal salts. In the embodiments which are antiperspirant compositions according to the present invention, such compositions need not include aluminum-containing metal salts, and can include other antiperspirant active materials, including other antiperspirant active metal salts. Generally, Category I active antiperspirant ingredients listed in the Food and Drug Administration's Monograph on antiperspirant drugs for over-the-counter human use can be used. In addition, any new drug, not listed in the Monograph, such as aluminum nitratohydrate and its combination with zirconyl hydroxychlorides and nitrides, or aluminum-stannous chlorohydrate, can be incorporated as an antiperspirant active ingredient in antiperspirant compositions according to the present invention.
Particular types of antiperspirant actives include aluminum zirconium trichlorohydrex and aluminum zirconium tetrachlorohydrex either with or without glycine. A particular antiperspirant active is aluminum trichlorohydrex gly such as AZZ-902 SUF (from Reheis Inc., Berkley Heights, N.J.) which has 98% of the particles less than 10 microns in size.
Antiperspirant actives can be incorporated into compositions according to the present invention in amounts in the range of 10-25% (on an actives basis) of the final composition, but the amount used will depend on the formulation of the composition. At lower levels the antiperspira

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