Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-07-31
2002-10-08
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S400000, C514S844000, C514S846000, C514S847000, C514S848000
Reexamination Certificate
active
06461626
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to topical compositions which upon application to the skin form a durable, discontinuous film which is resistant to wear and transfer and which also exhibits improved skin feel and appearance. The films are characterized by an abrasion resistance value, a coverage value and an average particle spacing which reflect this desired combination of wear resistance, good feel and appearance. In a further embodiment, the films are characterized by a defined flexibility value.
BACKGROUND OF THE INVENTION
A variety of topically-applied skin treatment products, including skin lotions, creams, cosmetic foundations and the like, are known. Such products are generally applied by massaging or rubbing into the skin with the fingers or sponge type applicator to provide essentially complete coverage of the skin with the product. Typically, about 80% or more of the skin surface is covered by the product, forming an essentially continuous film of product on the skin. While such continuous coverage can be beneficial, in certain applications it can result in undesirable effects. For example, while it is desirable to provide cosmetic foundations having good coverage properties, it has been difficult to achieve good coverage while maintaining a natural look and skin feel. This is a particular problem with wear or transfer resistant products. While such products may provide desirable properties such as resistance to transfer to objects such as linens, dishes and the like, this transfer resistance tends to come at the expense of skin feel. That is, long wear cosmetics tend to suffer from esthetic disadvantages such as perceived skin tightness, stiffness, tackiness and/or dryness.
Other methods of applying topical products are also known, including air brush, aerosol spraying, non-aerosol pump spraying, and electrostatic spraying. For example, electrostatic spraying of skin treatment agents is disclosed in U.S. Pat. No. 5,494,674, issued to Barnett et al. on Feb. 27, 1996. Electrostatic spraying of topical materials has been proposed as a means for more efficient consumption and product activity, control over application, ease and cleanliness/hygiene of application, and even coverage.
While a variety of topical compositions have been provided, there is an ongoing need to provide topical compositions which impart both good skin coverage and wear or transfer resistance, while at the same time providing a natural look and good skin feel.
In view of these limitations, after much experimentation it has now been found that transfer or wear resistant topical compositions, particularly pigmented cosmetic foundations, which are applied so as to form a substantially uniform and discontinuous film having defined properties provide improved skin appearance and skin feel. More particularly, the films provide a natural look and reduced sensations of tightness, dryness, tackiness and/or stiffness. These properties of wear or transfer resistance, appearance and feel are defined by an abrasion value, coverage value and particle spacing according to the methods herein.
The coverage value of the present films is significantly lower than products which are not applied in a discontinuous film, but rather for example applied using conventional methods of massaging or rubbing into the skin. Surprisingly, the preferred films nonetheless provide good coverage in terms of appearance, e.g., evening skin tone and masking local skin imperfections such as spots, blemishes, circles and the like. However, since the actual percent skin coverage is relatively low, the films look more natural.
SUMMARY OF THE INVENTION
The present invention relates to substantially uniform, discontinuous films of a topical composition having both wear or transfer resistant properties and good skin coverage, along with natural appearance and good skin feel.
The wear or transfer resistance is measured by an abrasion test resulting in an average resistance of less than about 6 mg, preferably less than about 3 mg, more preferably less than about 1 mg.
Skin appearance and skin feel are measured by a coverage value which is less than about 80%, preferably less than about 70%, more preferably less than about 60%, and an average particle spacing of at least about 3 microns, more preferably at least about 7 microns, most preferably at least about 10 microns.
Skin feel can be further characterized by a flexibility test resulting in an average percent weight loss of about 35 % or less, preferably about 30% or less, more preferably about 20% or less, even more preferably about 10% or less, most preferably about 5% or less.
The films can be formed by any method which provides the defined coverage value and particle spacing, including silk screening and the like and electrostatic spray techniques. The films are preferably formed by electrostatically spraying the composition onto the skin.
The topical compositions from which the films are formed comprise a (i) carrier which comprises one or more liquid diluents, (ii) one or more materials which provide wear or transfer resistance, and (iii) one or more particulate materials dispersed in the composition. The liquid diluents may be volatile or nonvolatile, and polar or non-polar.
The composition is preferably electrostatically sprayable, comprising at least one conductive material which is preferably a liquid, more preferably a volatile liquid. The electrostatically sprayable compositions may also comprise one or more insulating materials, at least one of which is preferably liquid and more preferably a volatile liquid. More preferably, the electrostatically sprayable composition comprises an emulsion wherein the insulating material and conductive material are in different phases, even more preferably wherein the insulating material is in the continuous, external phase and the conductive material is in the discontinuous, internal phase.
In a preferred embodiment, the topical composition further comprises one or more materials selected from structuring or thickening agents, emulsifiers and co-solubilizers.
The present invention can be used in a variety of topical applications where deposition of a wear or transfer resistant, discontinuous product film would be advantageous, and is particularly well suited to cosmetic foundation applications. For example, long wear or transfer resistant compositions of the invention may be designed and utilized to reduce potential for local irritation, to provide more uniform and/or natural-looking application of skin treatment agents or compositions, including pigmented products such as color cosmetics, and/or to improve the feel. Pigmented products provide sufficient coverage of imperfections, while providing a natural look. Better shade matching of skin and pigmented foundation compositions is also enabled, e.g., because the foundation integrates with the natural skin color, creating a composite shade. The present invention therefore enables broader useful shade palettes.
DETAILED DESCRIPTION OF THE INVENTION
The essential elements of the present invention are herein described below. Also included are non-limiting descriptions of various optional and preferred elements useful in the present invention.
The present invention can comprise, consist of, or consist essentially of any of the required or optional components and/or limitations described herein.
In the description of the invention various embodiments and/or individual features are disclosed. As will be apparent for the skilled practitioner all combinations of such embodiments and features are possible and can result in preferred executions of the invention.
All percentages and ratios are calculated by weight unless otherwise indicated. All percentages are calculated based on the total composition unless otherwise indicated.
All component or composition levels are in reference to the active level of that component or composition, and are exclusive of impurities, for example, residual solvents or by-products, which may be present in commercially available sources.
Referred to her
Rabe Thomas Elliot
Yen Helen Shu Ying
Bennett Rachel M.
Kendall Dara M.
Miller Steven W.
Page Thurman K.
Rosnell Tara M.
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