Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1996-09-23
2001-02-27
Ford, John M. (Department: 1624)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S159000, C510S405000, C510S437000, C510S535000
Reexamination Certificate
active
06194364
ABSTRACT:
TECHNICAL FIELD
The present invention relates to liquid personal cleansing compositions which contain non-polar, soluble oils and soluble, noncrystalline synthetic surfactants, but which exhibit good rheology and good lathering, skin feel and stability characteristics. At least about 40% by weight of the aqueous phase is soluble noncrystalline synthetic surfactant in the lamellar phase.
BACKGROUND OF THE INVENTION
Liquid personal cleansing products are becoming more popular in the United States and around the world. Desirable liquid personal cleansing compositions must meet a number of criteria. For example, in order to be acceptable to consumers, a liquid personal cleansing product must exhibit good cleaning properties, must exhibit good lathering characteristics, must be mild to the skin (not cause drying) and preferably should even provide a moisturization benefit to the skin.
Liquid personal cleansing products which contain high levels of lipophilic skin moisturizing agents have been disclosed. In fact, consumer products, such as Oil of Olay Moisturizing Body Wash which, especially when used with the Olay Cleansing Puff, deposit lipophilic skin moisturizing agents on the skin are enormously popular with consumers. Nevertheless, some consumers would prefer to have an even greater moisturizing benefit delivered from these liquid personal cleansing products. Therefore, it would be desirable to provide a liquid personal cleansing composition with even greater moisturizing properties.
Oil of Olay Moisturizing Body Wash contains soybean oil as the lipophilic skin moisturizing agent. It has been found that superior deposition can be provided by other, more efficient, lipophilic skin moisturizing agents (e.g., petrolatum). Unfortunately, petrolatum, which contains a broad mixture of hydrocarbons, is incompatible with soluble surfactants in the isotropic micellular phase, the predominant surfactant structure employed in the liquid cleanser industry. The incompatibility stems from the solubilization of the low molecular weight hydrocarbon components of the petrolatum into the inner core of the elongated worm-like micelles where they transform the micelles from elongated aggregates to globular aggregates. This is analogous to the formation of microemulsion droplets. The net result of this transformation is rheology deterioration from the loss of elongated micelles and severe lather deterioration from the exponentially increased oil surface area (the result of surfactant binding). It has been found that oils which contain as little as 1% soluble components (e.g., petrolatum) are incompatible with soluble surfactants in the isotropic micellular phase.
In the past, the only solution to this problem was to utilize materials which, by themselves, are insoluble crystalline surfactant structures (e.g., soap) when employing nonpolar, soluble oils. See, for example, WO 94/01084 which discloses semisolid soap compositions comprising potassium C8-C22 free fatty acid soap, water, a polyol, petrolatum and C8-C22 free fatty acid and WO 96/02229 which discloses compositions comprising 5-35% C8-C22 fatty acid soap, petrolatum, and a structurant (e.g., fatty alcohols). This solution was not ideal since the insoluble crystalline surfactant imparted an unpreferred paste-like rheology in the presence of the soluble oils. Additionally, personal cleansing compositions incorporating the combination of insoluble crystalline surfactants and soluble oils tended to have stability problems and imparted an unpreferred draggy skin feel.
It has now been found, however, that liquid personal cleansing compositions which contain soluble oils or oils having soluble components, such as petrolatum, and soluble, non-crystalline synthetic surfactants and which exhibit good rheology, stability, skin feel and lathering characteristics can be obtained by manipulating the surfactant structure from the predominant and widely used micellular phase toward lamellar liquid structure, also known as the neat phase.
SUMMARY OF THE INVENTION
The present invention relates to liquid personal cleansing emulsion compositions which contain a moisturizing phase and an aqueous cleansing phase. The moisturizing phase comprises a non-polar, soluble lipophilic skin moisturizing agent. The aqueous cleansing phase comprises a lathering, soluble, noncrystalline synthetic surfactant, a stabilizer and water. At least about 40% by volume of the aqueous phase comprises soluble non crystalline synthetic surfactant is in the lamellar phase. The liquid personal cleansing compositions of the present invention contain less than 5% insoluble crystalline surfactant.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to liquid personal cleansing compositions which provide clinically efficacious moisturization to the skin and which exhibit desirable rheology, lathering characteristics, stability and skin feel. As used herein, “liquid personal cleansing compositions” refers to rinse-off personal cleansing products, including, but not limited to, shower washes, liquid hand washes, and shampoos. The liquid personal cleansing compositions of the present invention are emulsions which contain a moisturizing phase comprising a non-polar, soluble lipophilic skin moisturizing agent and an aqueous cleansing phase comprising a lathering, soluble, noncrystalline synthetic surfactant in the lamellar phase, a stabilizer and water. The liquid personal cleansing compositions of the present invention contain less than 5% insoluble crystalline surfactant. As used herein “insoluble crystalline surfactant” refers to materials which are insoluble and crystalline at a concentration of 10% in water. Soap is an example of an insoluble crystalline surfactants.
The liquid personal cleansing compositions of the present invention, including the materials contained therein and processes for preparing, are described in detail as follows:
I. Ingredients
A. Moisturizing Phase
The liquid personal cleansing emulsion compositions of the present invention comprise a moisturizing phase which comprises from about 1% to about 30%, preferably from about 3% to about 25%, more preferably from about 5% to about 25% by weight of the composition of a non-polar, soluble lipophilic skin moisturizing agent. As used herein, the term “non-polar, soluble lipophilic skin moisturizing agent” refers to those lipophilic skin moisturizing agents which contain at least 1% by weight of soluble components. Soluble components are components which have a transmittance of greater than 5% (or greater than 3% over storage transmittance), as measured by the Turbidity Method set forth hereinafter in the Analytical Methods Section.
Suitable non-polar, soluble lipophilic skin moisturizing agent for use in the present invention include, for example, low molecular weight hydrocarbons, polymeric oils and silicones, and triglycerides comprised of predominantly short chain length fatty acids (e.g., <C1 8). Specific examples of non-polar, soluble lipophilic skin moisturizing agents for use in the personal cleansing compositions herein include petrolatum, mineral oil, coconut oil, palm oil, avocado oil, castor oil, polybutenes having a molecular weight of less than about 600, and silicones having a viscosity of less than about 1000 centistoke. Petrolatum is especially preferred for use herein.
B. Aqueous Cleansing Phase
The liquid personal cleansing emulsion compositions of the present invention also comprise an aqueous cleansing phase which comprises a lathering, soluble, noncrystalline synthetic surfactant in the lamellar phase, a stabilizer and water. Each of these is described in detail as follows:
1. THE LATHERING SURFACTANT
The personal cleansing emulsion compositions of the present invention also comprises from about 5% to about 30%, preferably from about 5% to about 25%, more preferably from about 10% to about 25%, and most preferably from about 12% to about 25% of a lathering, soluble, noncrystalline synthetic surfactant. A lathering surfactant is defined herein as a surfactant or surfactant mixture ther
Ford John M.
Little Darryl C.
Paul Andrew A
Rosnell Tara M.
Sripada Pavanaram K
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