Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1996-11-26
2001-08-21
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...
C424S811000, C424S811000, C514S786000, C514S787000
Reexamination Certificate
active
06277797
ABSTRACT:
TECHNICAL FIELD
The present invention relates to personal skin moisturizing and cleansing compositions.
BACKGROUND OF THE INVENTION
Moisturizers are usually applied directly to the skin as leave-on products. Personal cleansing products are usually applied with water as a foam or lather and rinsed off with clear water. Ideal rinse off personal cleansers should cleanse the skin gently, causing little or no irritation without defatting and or drying the skin and without leaving skin taut after frequent use. Most lathering personal cleansing products, bar soaps, liquids and syndet liquids fail in this respect. Some current commercial personal cleansing liquids claim to “moisturize” the skin. But, most of these current cleansing liquid products do not deliver an adequate moisturizing benefit. Therefore, users typically must moisturize their skin with a separate leave-on product following cleansing. It would be highly desirable to improve the delivery of skin moisturizers from a cleansing liquid composition over the current commercial personal cleansing liquids. If this were accomplished it would provide users with the convenience of obtaining both a cleansing and a moisturizing benefit from a single product.
Dual cleansing and lipid moisturizing liquid compositions are very difficult to formulate and process. One reason is the cleansing ingredients, in general, tend to be incompatible with the lipid moisturizing ingredients. Another problem is processing on a commercial scale. Yet another problem is getting the lipid in the liquid to deposit on the skin of the user. The deposition of lipid moisturizer from the liquid, onto the skin can be very low due to loss of the lipid in the wash and the rinse. Conversely, it can feel too sticky if deposited on the skin. Still another problem is formulating a dual liquid that lathers well. Another problem is formulating a dual liquid that is storage stable. Yet another problem is formulating a dual liquid that is stress stable.
The actual deposition of lipid moisturizer from a lathering dual liquid composition is essential for effective lipid benefit. No known commercial prior art liquid that claims to be a cleansing and lipid moisturizing liquid, deposits as much as 3 micrograms of lipid moisturizer per cm. sq. of washed skin.
U.S. Pat. No. 3,829,563, Barry et al., issued Aug. 13, 1974, discloses an emollient cleansing liquid and paste composition containing 10-70 parts by weight petrolatum with up to 98 parts, preferably, 95-98 parts, having a diameter particle size smaller than 5 microns.
U.S. Pat. No. 5,308,526, Dias et. al., issued May 3, 1994, incorporated herein by reference, discloses liquid skin compositions with up to 5 parts petrolatum wherein 20-80 parts of said petrolatum particles have a particle size from 10-120 microns.
U.S. Pat. No. 5,312,559, Kacher et al., issued May 17, 1994, incorporated herein by reference, discloses semi-solid compositions of 60,000 to 400,00 cps containing 0.5 parts to 15 parts petrolatum having a particle size distribution in which 20% to 80% of the particles are 10-120 microns.
Shelf stable dual skin cleansing liquid composition, as defined herein, are stable for at least two weeks at room temperature. However, such composition are not required to be stable under stress conditions, as defined below herein. In fact, the known non-polymeric stabilized dual skin cleansing liquid compositions are not stress stable.
Therefore, it is an object of the present invention to provide an effective, yet gentle, dual skin cleansing liquid composition which is stress stable.
It is an object of the present invention to provide an effective, yet gentle, dual skin cleansing liquid composition which actually deposits enough lipid on the skin to provide superior skin moisturizing and sensory benefits while maintaining its lathering and cleaning properties.
SUMMARY OF THE INVENTION
The present invention relates to a stress stable lathering skin cleansing liquid composition comprising by weight parts of the liquid composition:
(a) about 0.5 to 10 parts dispersed amorphous silica;
(b) from about 5 parts to about 30 parts of lipid skin moisturizing agent;
(c) from about 5 parts to about 30 parts of surfactant; and,
(d) water;
wherein said surfactant has a combined CMC equilibrium surface tension value of from 15 to 50; and wherein said stress stable lathering skin cleansing liquid composition has a Lipid Deposition Value (LDV) of from about 5 to about 1000; also wherein said lathering cleansing liquid has a shear index at 35° C. in the range 0.25-0.005 and a consistency k at 35° C. in the range 200-5000 poise; and wherein said composition is table for at least two weeks at 100° F. (38° C.).
DETAILED DESCRIPTION OF THE INVENTION
The present invention can provide a dual cleansing and lipid moisturizing liquid composition: 1) which produces an abundant, stable, high quality lather, 2) which is an effective skin cleanser, 3) which is very mild to the skin and ocular mucosae, 4) which actually delivers an effective amount of a lipid moisturizing agent to the skin of the user during the wash; 5) which is non-sticky after use, and 6) which is stress stable.
The present liquid is a stress stable lathering skin cleansing liquid composition comprising by weight pans of the following liquid composition:
(a) from about 0.5 parts to 10 parts dispersed amorphous silica of synthetic origin, i.e., fumed or precipitated;
(b) from about 5 parts to about 30 parts of lipid skin moisturizing agent having a Vaughan Solubility Parameter (VSP) of between 5 and 10; wherein said lipid has a shear index at 35° C. in the range 0.1 to 0.5 and a consistency k at 35° C. in the range 10 to 3,000 poise;
(c) from about 5 parts to about 30 parts of surfactant;
(d) water;
wherein said surfactant has a combined CMC equilibrium surface tension value of from 15 to 50; and wherein said stress stable lathering skin cleansing liquid composition has a Lipid Deposition Value (LDV) of from about 5 to about 1000; also wherein said lathering cleansing liquid has a shear index at 35° C. in the range 0.25-0.005 and a consistency k at 35° C. in the range 200-5000 poise; and wherein said composition is stable for at least two weeks at 100° F. (380C).
Glossary of Terms
The term “Oil in Water Emulsion Stabilizer” as used herein, is defined as an ingredient that helps to prevents the oil or lipid from separating in a cleanser's neat form while allowing lipid to be released to deposit on the skin when used in bath or shower, some examples of such stabilizers are: crystalline ethylene glycol fatty acid ester, water dispersible gel forming polymer or a combination of this ester and a water dispersible gel forming polymer.
The term “Amorphous Silica Stabilizer”, as used herein, refers to small, finely divided non-crystalline silica having a mean agglomerate particle size of less than about 100 microns.
The term “Shelf Stable Liquid Cleanser,” as used herein, is defined as a neat lathering skin cleansing liquid composition that under ambient conditions does not phase separate for at least two weeks, preferably for at least six months, and more preferable never.
The term “Stress Stable Liquid Cleanser,” as used herein, is defined as a neat lathering skin cleansing liquid composition that under 100° F. (38° C.) conditions does not phase separate for at least two weeks, preferably for at least six months, and more preferable never.
The term “Pseudoplastic”, as used herein, refers to fluids which show a marked decrease in viscosity as shear rate increases. This behavior is also referred to as shear thinning, which means that the resistance of the material to flow decreases as the energy required to sustain flow at high shear is reduced. High pseudoplasticity corresponds to a high consistency, k, and low shear index, n.
The term “Thixotropy”, as used herein, is defined as the ability of the system to exhibit lower viscosities as a function of shearing and its ability to have its structure reformed over a period of time after the shear is removed.
The term “Lipid Release”, as used he
Dunbar James Charles
Glenn, Jr. Robert Wayne
Kacher Mark Leslie
Ogden Necholus
Rosnell Tara M.
The Procter & Gamble & Company
Winter William J.
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