Deodorant with small particle zinc oxide

Details Deodorant with small particle zinc oxide Deodorant with small particle zinc oxide

2001-02-09

2002-03-19

Dodson, Shelley A. (Department: 1616)

Drug, bio-affecting and body treating compositions

Anti-perspirants or perspiration deodorants

Zinc compound containing

C424S065000, C424S400000, C424S401000

Reexamination Certificate

active

06358499

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to low residue deodorants in the form of solid sticks or gels, which are based on dibenzilidene sorbitol (DBS) as a gellant and a polyhydric alcohol such as propylene glycol (PG) as a solvent in combination with a selected dimethicone copolyol ester soluble in propylene glycol (PG). This invention relates to the use of these materials as anti-tack agents in combination with micronized zinc oxide and fragrance in deodorants formulations.
BACKGROUND OF THE INVENTION
Dibenzylidene sorbitol (also called dibenzaldehyde monosorbitol acetal, or dibenzyl monosorbitol acetal or dibenzylidene monosorbitol acetal) and derivatives thereof (such as those which are substituted on one or both of the aromatic rings with a fluorine or methoxy group and those which have the sorbitol portion replaced with other reduced sugars such as xylitol or ribitol as described in U.S. Pat. No. 5,609,855 assigned to Procter & Gamble) (collectively referred to as dibenzylidene sorbitol or “DBS”) may be used in various food and cosmetic applications. For cosmetic uses the more interesting ones are those focused on obtaining a translucent or clear product. While dibenzylidene sorbitol is stable in alkaline or neutral media, such compounds are not stable in acidic media. In an acidic environment, such as in the presence of acidic antiperspirant materials, and in the presence of even small amounts of water, the dibenzylidene sorbitol deteriorates and breaks down. Also, the use of DBS sometimes causes problems in the aesthetics of cosmetic products or problems with structural properties. Accordingly, there is a need to find a way to form products containing DBS which are stable and which have acceptable aesthetics.
The use of DBS in an antiperspirant formulation requires the inclusion of polyhydric alcohols such as propylene glycol as a solvent if a clear, transparent product is desired. The high propylene glycol content, when combined with aluminum salts which are included in antiperspirant compositions for wetness control, contribute to undesirable tackiness or a sticky feel for these products when applied to the axilla region of the body. Clear antiperspirant sticks were first formulated with DBS in the late 1970's. Since then there have been continued technical efforts to reduce the negative sensory attributes. Some of these efforts have focused on alternative solvents to replace a portion of the propylene glycol with organic esters known in the art as emollients. This creates a further problem since many of these emollients are either unsafe for personal care products or do not achieve acceptable aesthetics.
For formulating personal care products the incorporation of silicone fluids is known in the art. Silicone fluids such as cyclosiloxanes (for example, DOW CORNING® 244 and 245 Fluids) are used in some major commercial products. Silicone fluids are used because of their low tackiness, superior glide and skin-feel properties. However, silicone fluids are difficult to introduce into DBS based cosmetic stick products such as antiperspirants because they are not good solvents for DBS and they are not readily compatible with propylene glycol and many organic esters or emollients.
Some of the efforts to overcome these problems are described as follows. For example, some efforts have focused on the stability of DBS. United Kingdom Pat. No. GB 2 280 111 assigned to Union Camp Corporation, describes a gel stick composition comprising a dihydric alcohol as a primary solvent, a co-solvent such as low molecular weight polyethylene glycol, water and/or glycerine, a buffering agent and DBS as a gelling agent.
U.S. Pat. No. 4,720,381 to Schamper et al notes stability problems with this approach and itself describes the use of solvents having less reactive hydroxy groups or alcohols with selected chain lengths in a DBS composition.
U.S. Pat. No. 4,816,261 to Luebbe et al describes stable deodorant gel stick compositions comprising DBS with a polar solvent and a coupling agent such as polypropylene glycol ethers of fatty alcohols.
U.S. Pat. No. 4,822,602 to Sabatelli teaches the use of dimethicone copolyols and volatile silicones in clear DBS-based sticks.
U.S. Pat. No. 5,405,605 to Shin teaches anhydrous clear antiperspirant sticks substantially free of lower monohydroxy alcohols which sticks contain dibenzilidene monosorbitol with weak basic organic nitrogen containing compounds as a stabilizing agent.
U.S. Pat. No. 4,518,582 to Schamper, et al discloses an antiperspirant stick composition containing dibenzyl monosorbitol acetal in the presence of acidic antiperspirant-active salts, which composition is stable for extended periods of time at elevated temperatures. The composition contains at least a reactive solvent (such as water, methanol, ethanol, n-propanol, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, etc.), dibenzyl monosorbitol acetal, an antiperspirant-active compound, and a gel stabilizer such as magnesium sulfate, zinc acetate and mixtures thereof. This patent discloses that the stabilizer prevents or retards deterioration of the gelled sticks, especially when exposed to elevated temperatures.
Another patent disclosing stabilizers for solid gel antiperspirant sticks containing an acidic antiperspirant-active compound in the presence of dibenzyl monosorbitol acetal is U.S. Pat. No. 4,719,102 to Randhawa, et al. This patent discloses that the sticks include a solvent which is a small, polar organic compound such as cyclic esters, amides, amines, ketones, ureas, carbamates, sulfoxides and sulfones, and their open chain analogs; a cosolvent such as primary or low molecular weight alcohols and/or glycols; dibenzyl monosorbitol acetal; an antiperspirant-active compound; and a gel stabilizer such as N-(2-hydroxyethyl) fatty (C
8
-C
20
) acid amides, magnesium sulfate, zinc acetate, acetamide monoethanol amine and hexamethylenetetramine, and mixtures thereof.
U.S. Pat. No. 4,722,835 to Schamper, et al discloses antiperspirant gel stick compositions gelled with dibenzyl monosorbitol acetal and containing an acidic antiperspirant compound as well as a stabilizer such as 1% or less of zinc oxide for the gel. This patent teaches that the compositions include a solvent which is a small, polar organic compound, as discussed previously in connection with U.S. Pat. No. 4,719,102; dibenzyl monosorbitol acetal; an antiperspirant-active compound; and a gel stabilizer such as zinc oxide, calcium acetate, magnesium oxide, calcium carbonate, calcium hydroxide, magnesium carbonate, sodium carbonate, zinc carbonate and potassium carbonate. The basic metallic salt gel stabilizers are said to stabilize the gel, even at high temperatures. U.S. Pat. No. 5,250,291 to Park et al also teaches low levels of zinc oxide as a stabilizer for DBS systems. The use of zinc oxide as a stabilizer is believed to be needed because of the presence of the antiperspirant active.
U.S. Pat. No. 5,490,979 to Kasat et al describes a clear DBS stick comprising guanidine carbonate as the buffer and which is made by a unique processing method.
Other patent documents also disclose antiperspirant sticks gelled with dibenzylidene sorbitol and include stabilizers for the gel. EP Application No. 451 002 A2 discloses a stable, substantially anhydrous and substantially lower monohydric alcohol free, transparent, gelled, antiperspirant composition gelled by dibenzylidene monosorbitol acetal, containing acidic antiperspirants, and utilizing dihydric alcohols containing 3 to 6 carbon atoms as solvents, with the acetal being stabilized against hydrolysis and the formation of benzaldehyde by the presence of a stabilizing amount of a selected organic base, the organic base being a weakly basic, nitrogen-containing, organic compound. EP Application No. 512 770 A1 l discloses a stable, substantially anhydrous and substantially lower aliphatic monohydroxy alcohol free cosmetic composition gelled by dibenzylidene monosorbitol acetal, and containing acidic antiperspirant compounds and utilizing dihydroxy aliphatic

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