Drug – bio-affecting and body treating compositions – Live skin colorant containing – Lip
Reexamination Certificate
2001-06-05
2004-04-06
Page, Thurman K. (Department: 1625)
Drug, bio-affecting and body treating compositions
Live skin colorant containing
Lip
C424S063000, C424S070600, C424S070700
Reexamination Certificate
active
06716419
ABSTRACT:
TECHNICAL FIELD
The present invention covers psesudoplastic cosmetic compositions having improved aesthetic attributes such as hair fiber separation, thickening, detangling, smooth application, film-forming properties and improved wear.
BACKGROUND OF THE INVENTION
Mascaras are a major cosmetic product of significant importance to the cosmetic industry. Mascara products are used to enhance the beauty of a person's eyes by coating the eyelashes, and in some cases, the eyebrows, to primarily thicken, lengthen, color, and define the individual lashes.
Mascaras come in a variety of forms including cakes or blocks, creams, gels, and low viscosity liquids. Cake mascaras were originally the most popular form of this cosmetic. They typically contained at least 50% soap whereby the pigment was mixed with the soap and stamped into cakes. With a wet brush, it could be lathered and then applied to the lashes resulting in a satisfactory, smooth application. As such the cream and liquid mascaras have been traditionally limited to relatively low viscosities or have had limited shear-thinning behavior. Their primary drawback was that the film on the lashes was very water soluble and prone to smudging and running of the product transferring to the skin around the perimeter of the eye. Later on, improvements were made to the cake mascara such as incorporating waxes to improve the water-resistance over the original soap-based form. This was usually at the expense of the smoothness of application. That is, as the viscosity of the mascara formulation increases, it becomes increasingly harder to apply, messier, and yields less separation of the lashes.
The advent of mascara applicators also provided a means for expanding formulation options for mascaras. For example, in addition to “cakes”, mascaras could be formulated as creams or liquids. Cream mascaras were usually dispersions of waxes and pigments in water with the end consistency very much like a vanishing cream. Combined with an automatic applicator, they soon surpassed the cake mascara in popularity due to their convenience of use. That is, this form became less dependent upon actual technique of the user than the cake-based applicators. Most of the ingredients were similar to the improved form of the cake mascara mentioned above and so many of the same shortcomings were still inherent. However, because it was a cream texture, the concentration of water was greater and allowed for the incorporation of natural and synthetic film-formers to help improve wear. The primary drawback of adding these film-formers was shortened application time. As the water evaporated, the polymers quickly coalesced to form unevenly distributed films, resulting in increased clumping of the mascara on the lashes.
U.S. Pat. No. 5,614,200 discloses the use of a setting rate agent to delay the setting rate of the composition long enough to provide sufficient time to distribute the mascara in semi-liquid form to avoid such clumping. The formulations disclosed therein provided lash separation and application ease at the expense of wear (i.e., smearing and water resistance). There remains, however, a need for cosmetic compositions, particularly mascaras that detangle and separate lashes without sacrificing wear and lash thickening. More importantly, there is a need for cosmetic products, namely mascaras, that exhibit improved application and separation benefits despite being viscous. Notwithstanding the above, the present inventors have found that cosmetic compositions that exhibit certain rheological performance parameters relative to pseudoplasticity are capable of achieving these desirable benefits. Therefore, the present inventors have found that compositions, particularly mascaras, that exhibit a turning point stress of from about 650 Pa to about 1500 Pa and a high shear rate slope of less than about 0.5 Pa-s are capable of achieving these desirable benefits. Applicants have also found that the compositions disclosed herein are also useful for other cosmetic applications that relate to keratinous tissues like skin, e.g., lipsticks, foundations, eyeliners, lipliners, eyeshadows, rouges, etc., where it is desirable to provide a smooth application of a long wearing, film-forming cosmetic product.
SUMMARY OF THE INVENTION
The present invention relates to cosmetic compositions having improved application benefits to keratinous tissue and keratinous fibers wherein said compositions have improved application benefits, while avoiding the negatives associated with compositions currently known in the art. The presently claimed compositions exhibit a turning point stress of from about 650 Pa to about 1500 Pa and a high shear rate slope of less than about 0.5 Pa-s.
DETAILED DESCRIPTION OF THE INVENTION
As used herein, the term “cosmetics” includes make-up and hair care products.
The term “make-up” refers to products that leave color on the face, including on the eyelashes, eyebrows, cheeks, lips, etc.
Hair care products are those used to treat, care for, or somehow impart aesthetically pleasing attributes to mammalian hair fibers. Products contemplated by the phrase “hair care products” include, but are not limited to, hair conditioners, shampoos, detangling sprays and the like.
The term “keratinous tissue,” as used herein, refers to keratin-containing layers disposed as the outermost protective covering of mammals (e.g., humans, dogs, cats, etc.) which includes, but is not limited to, skin, lips, hair, toenails, fingernails, cuticles, hooves, etc.
As used herein, the term “keratinous fibers” refers particularly to mammalian (e.g., human or animal) hair such as hair on the head or body, brows and eyelashes.
The term “topical application”, as used herein, means to apply or spread the compositions of the present invention onto the surface of the keratinous tissue.
The term “dermatologically-acceptable,” as used herein, means that the compositions or components thereof so described are suitable for use in contact with mammalian keratinous tissue without undue toxicity, incompatibility, instability, allergic response, and the like.
The term “safe and effective amount” as used herein means an amount of a compound or composition sufficient to significantly induce a positive benefit, preferably a positive keratinous tissue appearance or feel benefit, including independently or in combinations the benefits disclosed herein, but low enough to avoid serious side effects, i.e., to provide a reasonable benefit to risk ratio, within the scope of sound judgment of the skilled artisan.
All percentages and ratios used herein are by weight of the total composition and all measurements made are at 25° C., unless otherwise designated.
The compositions of the present invention can comprise, consist essentially of, or consist of, the essential components as well as optional ingredients described herein. As used herein, “consisting essentially of” means that the composition or component may include additional ingredients, but only if the additional ingredients do not materially alter the basic and novel characteristics of the claimed compositions or methods.
All publications cited herein are hereby incorporated by reference in their entirety.
Rheology Method
The compositions of the present invention exhibit a turning point stress of from about 650 Pa to about 1500 Pa and a high shear rate slope of less than about 0.5 Pa-s. In more preferred embodiments, the turning point stress is from about 750 Pa to about 1200 Pa, and even more preferably, from about 850 Pa to about 1000 Pa. Additionally, it is preferred that the high shear rate slope be less than about 0.25 Pa-s and even more preferred that it be less than about 0.01 Pa-s.
In order to determine the abovementioned rheological limitations of the presently claimed compositions, the following method was developed. The instrument and accessories used for this method include a rheometer (e.g., Haake RS 150), a 20 mm cone with a 1° angle, a 20 mm plate, a water bath, and a solvent trap. The following conditions should be met as well: 1) controlled s
Gilley John Michael
Scott Alic Anthony
Zoltowski Craig Eugene
Kendall Dara M.
Page Thurman K.
Pierre Kenya T.
Sheikh Humera N.
The Procter & Gamble & Company
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