Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-09-28
2003-12-09
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S152000, C510S153000, C510S155000, C510S156000, C510S426000, C510S428000
Reexamination Certificate
active
06660699
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a toilet bar suitable for topical application for cleansing the human body, such as the skin and hair. In particular, it relates to a toilet bar composition that is mild to the skin and which contains at least one latent acidifier.
2. The Related Art
The following all disclose laundry detergent bar compositions that contain various filler materials. U.S. Pat. No. 4,806,273 issued to Barone, et al. on Feb. 21, 1989 and U.S. Pat. No. 5,053,159 issued to Joshi on Oct. 1, 1991 disclose the use of various water insoluble fillers such as talc, calcium silicate, magnesium silicate, calcium sulfate, silica, bentonite, calcium phosphate and calcium carbonate in synthetic detergent laundry bars. U.S. Pat. No. 3,178,370 issued to Okenfuss on Apr. 13, 1965 discloses detergent laundry bar composition containing a broad range of salts. U.S. Pat. No. 4,705,644 issued to Barone, et al. on Nov. 10, 1987 also teach synthetic detergent laundry bars that contain various insoluble particulate materials and teach that calcium carbonate and talc are especially useful materials therein.
PCT publication no. WO98/06810 to Hauwermeiren, et al., published on Feb. 19, 1998 teaches laundry detergent compositions having filler salts selected from alkali and alkaline-earth metal sulfates & chlorides, with sodium sulfate as a preferred filler. PCT publication no. WO 98/38269 to Ramanan, et al., published on Sep. 3, 1998 discloses a laundry detergent bar with improved physical properties arising from the formation of a complex of calcium and the siliceous material in-situ. PCT publication no. WO 98/53040 to Ramanan, et al., published Nov. 26, 1998 discloses a laundry bar with improved sudsing and physical properties having a metal-anionic sulfonate surfactant complex.
The above patents and publications however, fail to disclose or suggest a mild to the skin toilet bar containing an effective amount of one or more specific latent acidifiers sufficient to provide pH reduction to the bar in the form of an aqueous slurry delta pH of about 0.5 or more, nor a R
ys
value (as defined below) in the range of about 0.70 to about 1.3. Aqueous slurry delta pH is herein defined as the value obtained when the pH of a 10% aqueous slurry of a bar with the latent acidifier is subtracted from the pH of an aqueous slurry of a bar without the latent acidifier. R
ys
is herein defined as the ratio of the yield stress of the bar containing the latent acidifier to the yield stress of the bar without the latent acidifier or,
R
ys
=
Yield
stress
of
bar
with
latent
acidifier
Yield
stress
of
bar
without
latent
acidifier
Latent acidifiers are limited to organic or inorganic materials that when incorporated into a toilet bar do not substantially convert soaps or other alkaline materials contained in the bar to the free acid form and thus do not degrade the bar's hardness as evidenced by yield stress measurements. As the bar is used with water, the latent acidifiers surprisingly either neutralize harsh soaps, or other alkaline materials contained in the toilet bar, or reduce the pH of the bar through other acid-base interactions, so as to create a mild cleansing action for the skin without substantially degrading the bar's hardness. Latent acidifiers are further limited to compounds that do not release a gas with a change in pH and therefore do not include e.g. carbonates, bicarbonates, sulfites, and the like.
SUMMARY OF THE INVENTION
In one aspect the present invention is a toilet bar, having:
(a) about 0 to about 30% by wt.; preferably about 0 to about 20% by wt.; and more preferably about 0 to about 15% by wt. of a fatty acid soap;
(b) about 15 to about 60%; preferably about 20 to about 55%; and more preferably about 25 to about 50% by wt. of a non-soap anionic surfactant; and
(c) a latent acidifier in an effective amount to yield an aqueous slurry delta pH value of more than about 0.5, and preferably more than about 1.0.
In a preferred embodiment, there is at least about 0.1% by wt. of a fatty acid soap; preferably more than about 0.5% by wt.; and more preferably more than about 1.0% by wt.
In another aspect of the present invention is a toilet bar, having
(a) about 30 to about 80% by wt. ; preferably about 40 to about 70% by wt.; more preferably about 50% to about 60% by wt. of a fatty acid soap;
(b) about 5 to about 40% by wt. ; preferably about 7 to about 30%; more preferably about 10 to about 20% by wt. of a non-soap anionic surfactant; and
(c) a latent acidifier in an effective amount to yield an aqueous delta pH value of more than about 0.5, preferably more than about 1.0.
In a further aspect of the present invention is a toilet bar, having
(a) about 40 to about 85% by wt.; preferably 50 to about 80% by wt.; more preferably about 60 to about 75% by wt. of a fatty acid soap;
(b) about 0 to about 10% by wt.; preferably about 0 to about 7% by wt.; more preferably about 0 to about 5% by wt. of a non-soap anionic surfactant; and
(c) a latent acidifier in an effective amount to yield a delta pH value of more than about 0.5, preferably more than about 1.0.
In a preferred embodiment of this aspect of the invention, there is more than about 0.1% by wt. of a non-soap anionic surfactant; preferably more than about 0.5% by wt.; and more preferably more than about 1.0% by wt.
DETAILED DESCRIPTION OF THE INVENTION
In one aspect the present invention is a toilet bar, having:
(a) about 0 to about 30% by wt.; preferably about 0 to about 20% by wt.; and more preferably about 0 to about 15% by wt. of a fatty acid soap;
(b) about 15 to about 60%; preferably about 20 to about 55%; and more preferably about 25 to about 50% by wt. of a non-soap anionic surfactant; and
(c) a latent acidifier in an effective amount to yield an aqueous slurry delta pH value of more than about 0.5, preferably more than about 1.0.
In a preferred embodiment, there is at least about 0.1% by wt. of a fatty acid soap; preferably more than about 0.5% by wt.; and more preferably more than about 1.0% by wt.
Preferably, the latent acidifier is in the concentration range of about 0.1 to about 20% by wt., preferably about 1 to about 10% by wt. Advantageously, the fatty acid soaps consist of a blend of C6 to C22 soaps, preferably a blend of C12 to C18 soaps. Preferably the non-soap anionic surfactant is selected from C8 to C14 acyl isethionates; C8 to C14 alkyl sulfates, C8 to C14 alkyl sulfosuccinates, C8 to C14 alkyl sulfonates; C8 to C14 fatty acid ester sulfonates, derivatives, and blends thereof, and the like.
Latent acidifiers may be organic or inorganic compounds, or blends or complexes thereof as mentioned above. Examples of useful organic compounds include the following: acetates, propionates, glycolates, lactates, aluminum-zirconium chlorohydrate glycine complex, and the like. Preferably the latent acidifier is an inorganic salt. Advantageously it is selected from aluminum sulfate, aluminum chloride, aluminum chlorohydrate, aluminum-zirconium trichlorohydrate, aluminum-zirconium trichlorohydrate glycine complexe, zinc sulfate, ammonium chloride, ammonium phosphate, calcium acetate, calcium chloride, calcium nitrate, calcium phosphate, calcium sulfate, ferric sulfate, magnesium chloride, magnesium sulfate, and the like. Most preferably the latent acidifier is calcium sulfate.
Preferably the inventive bar contains an amount of free water less than about 10% by wt., preferably less than about 7% by wt. and most preferably less than about 3% by wt. Free water is herein defined as that quantity of water present in the bar which is able to solvate acidic compounds. This ability is in contrast to bound water, such as the water of crystallization of unsolvated materials, whereby the bound water is unable to solvate acidic materials to the same extent that free water can.
Preferably, th
Casbarro Bruce
Finucane Kevin Michael
Podgorsky Joseph J.
Puvvada Sudhakar
Bornstein Alan A.
Ogden Necholus
Unilever Home & Personal Care USA
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