Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2002-04-08
2002-12-31
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C424S400000, C424S401000, C514S937000, C514S938000
Reexamination Certificate
active
06500412
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an improved efficacy antiperspirant gel with improved aesthetics, especially reduced tack or stickiness. The invention is a compressed water-in-oil emulsion comprising 65-90 weight % of an internal/dispersed active phase which (1) includes an antiperspirant active with a low metal:chloride ratio, (2) is free of added ethanol and propylene glycol, and (3) is free of elastomer, soap and borate gelling agents.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 6,007,799 to Lee et al describes a clear cosmetic gel which is a water-in-oil emulsion and which can include propylene and/or tripropylene glycol. The composition also includes an alkoxylated alkyl substituted siloxane surface active agent.
U.S. Pat. Nos. 5,587,153 and 5,863,525 to Angelone et al describes a clear gel-type cosmetic products which may be made with ethanol and propylene glycol.
U.S. Pat. No. 5,925,338 to Karassik et al describes clear antiperspirant or deodorant gel compositions with linear silicone to reduce staining which comprises a polyether substituted silicone emulsifying agent and a volatile cyclic silicone and a volatile linear silicone.
U.S. Pat. No. 5,730,963 to Hilliard describes a cosmetic gel having low irritation wherein the glycol component is controlled as to composition. Selected embodiments include those with tripropylene glycol and others having no added propylene glycol.
U.S. Pat. No. 5,393,518 to Kwass describes an optically clear liquid antiperspirant product with is a stable water-in-oil emulsion having a viscosity of less than 1000 cps. The composition includes the use of propylene glycol and ethanol.
WO 01/85118 to Unilever describes antiperspirant/deodorant compositions which are free of “simple glycols” (as defined) and middle chain alcohols.
WO 01/85121 to Unilever is similar to WO 01/85118 but also includes a coupling agent and an ethylene glycol adduct.
SUMMARY OF THE INVENTION
The invention comprises a clear, low tack, water-in-oil emulsion comprising:
(a) 5-25 weight % (preferably 10-25% and more preferably 15-25%) of an antiperspirant salt (anhydrous basis) having a metal:chloride ratio in the range of 0.9-1.4:1;
(b) 5-15 weight % of tripropylene glycol;
(c) 35-70 weight % water;
(d) 5-30 weight % of a volatile silicone which is not an elastomer;
(e) 0.1-5 weight % (particularly 0.1-3% and more particularly 0.1-1.0%) of a silicone copolyol surfactant; and
(f) 0-20 weight % (particularly 1-15%, and more particularly 1-9%) of a nonvolatile silicone which is not an elastomer;
having an external phase comprised of (a)+(b)+(c) and an internal phase of (d)+(e)+(f), wherein the ratio of external phase to internal phase is in the range of 65-90:10-35 (more particularly 75-85:15-25), and wherein the composition is free of (1) added low molecular weight alcohols (that is, C1-5 saturated alcohols, particularly ethanol), (2) added propylene glycol (no more than 1% and preferably less than 0.1%), (3) elastomer gelling agents, (4) soap gelling agents (5) borate gelling agents, and (6) coupling agents, and wherein all amounts are in % by weight based on the total weight of the composition.
It should be noted that the ability to use tripropylene glycol (“TPG”) in this invention is unexpected, since normally glycols cause such compositions to be sticky. In this formulation, the use of TPG does not result in a sticky formulation, as evidenced by sensory testing on skin as described below.
DETAILED DESCRIPTION OF THE INVENTION
For the antiperspirant active used in the internal (also called “active”) phase various antiperspirant active materials that can be utilized according to the present invention provided that they are soluble at a suitable concentration in the active phase and have the required metal:chloride ratio. These include conventional aluminum and aluminum/zirconium salts, as well as aluminum/zirconium salts complexed with a neutral amino acid such as glycine, as known in the art. See each of European Patent Application Number. 512,770 A1 and PCT case WO 92/19221, the contents of each of which are incorporated herein by reference in their entirety, for disclosure of antiperspirant active materials. The antiperspirant active materials disclosed therein, including the acidic antiperspirant materials, can be incorporated in the compositions of the present invention if they are soluble in the active phase. Suitable materials include (but are not limited to) aluminum chlorides (various types including, for example, anhydrous form, hydrated form, etc.), zirconyl hydroxychlorides, zirconyl oxychlorides, basic aluminum chlorides, basic aluminum chlorides combined with zirconyl oxychlorides and hydroxychlorides, and organic complexes of each of basic aluminum chlorides with or without zirconyl oxychlorides and hydroxychlorides and mixtures of any of the foregoing. 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 dichlorohydrate, aluminum chlorohydrex PEG, and mixtures of any of the foregoing. 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 tin or titanium salts used alone or in combination with aluminum compounds (for example, aluminum-stannous chlorohydrates), aluminum nitratohydrate and its combination with zirconyl hydroxychlorides and nitrates, can be incorporated as an antiperspirant active ingredient in antiperspirant compositions according to the present invention. Preferred antiperspirant actives that can be incorporated in the compositions of the present invention include the enhanced efficacy aluminum salts and the enhanced efficacy aluminum/zirconium salt-glycine materials, having enhanced efficacy due to improved molecular distribution, known in the art and discussed, for example, in PCT No. WO92/19221, the contents of which are incorporated by reference in their entirety herein. Particular actives include Westchlor ZR 35B aluminum zirconium tetrachlorhydrex gly(from Westwood Chemical Corporation, Middletown, N.Y.);, and Rezal 36 GP and AZP 902 aluminum zirconium tetrachlorhydrex gly both from Reheis, Berkeley Heights, N.J. as well as Rezal AZZ 908 from Reheis. In general, the metal:chloride mole ratio is in the range of 2.1-0.9:1 for such salts.
Actives of special interest because they form low RI solutions include: Westchlor Zr 35BX4 (30-35% actives in water) from Westwood Chemical Company, Middletown, N.Y.; Summit AZG-368 (28-32% in water) from Summit Research Labs, Huguenot, N.Y.; Summit Z522, Z529, Z498 and Z576; and aluminum chloride (28% in water) which may be obtained from several sources. In general, the metal:chloride mole ratio is approximately 1.2:1 for such salts.
In one particular type of salt of interest, an aluminum zirconium tetra salt with glycine is used wherein aluminum zirconium tetrachlorohydrex glycine salt having a metal to chloride ratio in the range of 0.9-1.2:1 (especially in the range of 0.9-1.1:1 and, more particularly in the range of 0.9-1.0:1); and a glycine:zirconium mole ratio greater than 1.3:1, particularly greater than 1.4:1.
Mixtures of actives can also be used, provided a suitable amount o
Brahms John
Johansson Marie
Colgate-Palmolive Company
Dodson Shelley A.
Miano Rosemary M.
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