Cosmetic compositions

Details Cosmetic compositions Cosmetic compositions

2001-05-08

2003-02-25

Pryor, Alton (Department: 1616)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

C514S063000, C514S844000

Reexamination Certificate

active

06524598

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to cosmetic compositions comprising a combination of non-emulsifying and emulsifying crosslinked siloxane elastomers.
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.
New systems are needed to carry relatively high levels of aqueous based moisturizing ingredients (e.g. glycerin).
Accordingly, one aspect of the present invention is to provide cosmetic compositions that provide 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 that achieves a smooth non-draggy rub-in upon initial application to the skin.
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 cosmetic compositions comprising:
(i) from about 0.1% to about 15% of non-emulsifying crosslinked siloxane elastomer having a average particle size less than 20 microns;
(ii) from about 0.1% to about 15% of emulsifying crosslinked siloxane elastomer;
(iii) from about 10 to about 80% of a solvent for the crosslinked siloxane elastomers;
(iv) optionally, from 0 to about 50% of skin conditioning agent; and
(v) from above about 0 to about 95% of water.
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 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% air.
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 and the like. As used herein, “excess moisture” means an undesirable and/or unhealthy level of bodily fluids deposited on human skin. The term “foundation” refers to liquid, cream, 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 skin.
The term “ambient conditions” as used herein refers to surrounding conditions under about one atmosphere of pressure, at about 50% relative humidity, and at about 25° C. unless otherwise specified.
The term “yield point,” as used herein is non-directional and refers to initial resistance to flow under applied stress; and is measured using Haake Controlled Stress Rheometer RS150 with a 35 mm/4 deg. cone and plate.
As used herein the term “comprising” means that the composition can contain other ingredients which are compatible with the composition and which preferably do not substantially disrupt the compositions of the present invention. The term encompasses the terms “consisting of” and “consisting essentially of”.
Unless otherwise indicated, all percentages and ratios used herein are by weight of the total composition. All weight percentages, unless otherwise indicated, are on an actives weight basis. All measurements made are at 25° C., unless otherwise designated.
Crosslinked Siloxane Elastomer
An essential component of the present invention is a crosslinked organopolysiloxane elastomer. No specific restriction exists as to the type of curable organopolysiloxane composition that can serve as starting material for the crosslinked organopolysiloxane elastomer. Examples in this respect are addition reaction-curing organopolysiloxane compositions which cure under platinum metal catalysis by the addition reaction between SiH-containing diorganopolysiloxane and organopolysiloxane having silicon-bonded vinyl groups; condensation-curing organopolysiloxane compositions which cure in the presence of an organotin compound by a dehydrogenation reaction between hydroxyl-terminated diorganopolysiloxane and SiH-containing diorganopolysiloxane; condensation-curing organopolysiloxane compositions which cure in the presence of an organotin compound or a titanate ester, by a condensation reaction between an hydroxyl-terminated diorganopolysiloxane and a hydrolyzable organosilane (this condensation reaction is exemplified by dehydration, alcohol-liberating, oxime-liberating, amine-liberating, amide-liberating, carboxyl-liberating, and ketone-liberating reactions); peroxide-curing organopolysiloxane compositions which thermally cure in the presence of an organoperoxide catalyst; and organopolysiloxane compositions which are cured by high-energy radiation, such as by gamma-rays, ultraviolet radiation, or electron beams.
Addition reaction-curing organopolysiloxane compositions are preferred for their rapid curing rates and excellent uniformity of curing. A particularly preferred addition reaction-curing organopolysiloxane composition is prepared from:
(A) an organopolysiloxane having at least 2 lower alkenyl groups in each molecule;
(B) an organopolysiloxane having at

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