Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2001-05-08
2002-11-05
Krass, Frederick (Department: 1614)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S484000, C424S486000, C424S502000, C424S063000, C424S064000, C424S065000, C424S489000, C424S400000, C514S063000, C514S772100, C514S844000, C514S944000, C514S951000
Reexamination Certificate
active
06475500
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to anhydrous cosmetic compositions comprising elastomeric silicones of specific particle size and viscosity.
BACKGROUND OF THE INVENTION
Emollients including organic esters and hydrocarbons, especially petrolatum, have long been used medicinally as skin conditioning agents. These substances are second only to water as moisturizing ingredients of choice. They function primarily as an occlusive barrier. The water content of the outer layers of human skin stratum corneum is a controlling factor in the appearance of dry skin symptoms. When the stratum corneum contains an adequate amount of water within the range of ten to twenty percent, the skin remains flexible. However, when the water content falls below ten percent the stratum corneum often becomes brittle and rough and can exhibit scaling and cracking.
The stratum corneum receives its water from the deep layers of the epidermis by diffusion or when it is brought into direct contact with water. The diffusion process is controlled by the water content of the skin as well as the concentration gradient. In a very dry environment, the water loss from the external skin layers can be significant and often exceeds the rate of replacement by diffusion. An occlusive or semi-occlusive barrier substance placed on the surface of the skin acts to retard water loss to the environment. It also allows the skin surface to rehydrate via a diffusion mechanism.
While there are many effective and economical skin-conditioning agents, they nevertheless suffer from certain disadvantages.
Often the emollient types are delivered as water-in-oil emulsions. It is difficult to attain the critical formula balance between oil and water phases to an extent sufficient to ensure long-term storage stability. One part of this critical balance is the internal phase volume. A critical volume must be obtained to maximize the chemical and physical interactions that produce and stabilize the system. If this critical volume is not balanced properly the product may suffer from viscosity change and eventual phase separation. Usually the optimum volume is quite large which limits the external phase volume size, and gives the system a draggy unfavorable slow break attribute. This critical internal phase volume restriction can reduce functionality and add unfavorable feel characteristics.
Anhydrous systems avoid emulsion stability problems. Unfortunately other aesthetic issues arise with anhydrous systems. Not all oily phase materials are compatible at high concentration. Moreover, occlusive agents such as petrolatum are relatively greasy. They suffer the disadvantage of transfer onto clothing and are not easily removed from the skin by washing with soap. Neither do they allow for adequate penetration into the epidermis.
New systems are needed which avoid such problems as greasy feel and which address the “transfer” typically associated with anhydrous products.
Accordingly, one aspect of the present invention is to provide cosmetic compositions that are anhydrous yet provides improved skin-feel properties.
Another aspect of the present invention is to provide a skin treatment composition that has stability against phase separation even under freeze/thaw cycling.
Still another aspect of the present invention is to provide a skin treatment composition which achieves a smooth non-draggy rub-in upon initial application to the skin and which is not easily removed from the skin with water.
These and other aspects of the present invention will become more readily apparent from consideration of the following summary and detailed description.
SUMMARY OF THE INVENTION
The present invention relates to anhydrous cosmetic compositions comprising:
(i) at least one fatty or oil phase comprising:
(a) from about 0.1 to about 10% of non-spherical crosslinked siloxane elastomer having a particle size of from above 10 to about 200 microns wherein the crosslinked siloxane elastomer is capable of swelling and absorbing greater than 30% by weight of a solvent fluid;
(b) from about 10 to about 80% of a solvent for the crosslinked siloxane elastomer, wherein the solvent forms a gel with the crosslinked siloxane elastomer having yield point of at least 50 Pa;
(ii) from about 0.1% to about 10% of an emulsifier;
(iii) from about 0.1% to about 50% of a humectant;
(iv) optionally, from 0 to about 50% of skin conditioning agent;
(v) from about 0.1% to about 30% pigment; and
(vi) from 0 to about 5% water
wherein the composition has a yield point of from about 100, preferably from about 400, to about 4000, preferably to about 2000 Pa and wherein the oil or fatty phase of the composition contains less than 10% by weight solids or solid materials and further wherein the gel formed by the solvent and crosslinked siloxane elastomer provides an even, uniform distribution of the pigments in the film and, prior to film drying, the pigments are embedded in the film. Preferably, the compositions are opaque and preferably comprise a cosmetic base for the silicone elastomer gel that is substantially free of silicone oil.
Also claimed herein are anhydrous cosmetic compositions comprising:
(i) at least one fatty or oil phase comprising:
(a) from about 0.1 to about 10% of non-spherical crosslinked siloxane elastomer having a viscosity of from above 20,000 to about 6,000,000 cps wherein the crosslinked siloxane elastomer is capable of swelling and absorbing greater than 30% by weight of a solvent fluid;
(b) from about 10 to about 80% of a solvent for the crosslinked siloxane elastomer, wherein the solvent forms a gel with the crosslinked siloxane elastomer having yield point of at least 50 Pa;
(ii) from about 0.1% to about 10% of an emulsifier;
(iii) from about 0.1% to about 50% of a humectant;
(iv) optionally, from 0 to about 50% of skin conditioning agent;
(v) from about 0. 1% to about 30% pigment; and
(vi) from 0 to about 5% water
wherein the composition has a yield point of from about 100, preferably from about 400, to about 4000, preferably to about 2000 Pa and wherein the oil or fatty phase of the composition contains less than 10% by weight solids or solid materials and further wherein the gel formed by the solvent and crosslinked siloxane elastomer provides an even, uniform distribution of the pigments in the film and, prior to film drying, the pigments are embedded in the film such that substantially no pigment resides on or protrudes through the surface of the film.
Also disclosed herein are cosmetic compositions comprising:
(i) from about 0.1% to about 15% of crosslinked siloxane elastomer having an average particle size less than 20 microns;
(ii) from about 10 to about 80% of a solvent for the crosslinked siloxane elastomer;
(iii)optionally, from 0 to about 50% of skin conditioning agent; and
(iv) optionally, from above about 0 to about 95% of water
wherein the composition contains at least about 1% airs
DETAILED DESCRIPTION OF THE INVENTION
As used herein, the term “cosmetics” includes make-up, foundation, and skin care products. The term “make-up” refers to products that leave color on the face, including foundation, blacks and browns, i.e., mascara, concealers, eye liners, brow colors, eye shadows, blushers, lip colors, powders, solid emulsion compact, and so forth. “Skin care products” are those used to treat or care for, or somehow moisturize, improve, or clean the skin. Products contemplated by the phrase “skin care products” include, but are not limited to, adhesives, bandages, toothpaste, anhydrous occlusive moisturizers, antiperspirants, deodorants, personal cleansing products, powder laundry detergent, fabric softener towels, occlusive drug delivery patches, nail polish, powders, tissues, wipes, hair conditioners-anhydrous, shaving creams, antiwrinkle or line-minimizing products and the like. The term “foundation” refers to liquid, creme, mousse, pancake, compact, concealer or like product created or reintroduced by cosmetic companies to even out the overall coloring of the skin. Foundation is manufactured to work better over moisturized and/or oiled sk
Motley Curtis Bobby
Sunkel Jorge Max
Vatter Michael Lee
Kendall Dara M.
Miller Steven W.
Rosnell Tara M.
The Procter & Gamble & Company
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