Drug – bio-affecting and body treating compositions – Manicure or pedicure compositions
Reexamination Certificate
2000-07-07
2003-05-20
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Manicure or pedicure compositions
C424S401000
Reexamination Certificate
active
06565835
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates in general to nail enamel compositions, and more particularly, to nail enamel compositions containing aluminum platelets for forming a film having a mirrorlike appearance over natural or synthetic human nails.
BACKGROUND OF THE INVENTION
Nail enamel compositions include a class of nail care products regularly used by women as part of their beauty care routine. These nail care products are available in a multitude of product formulations, from clears to a variety of colors. Typically, clear nail enamel compositions include a film forming polymer, a film forming resin, a plasticizer and one or more solvents. In the case of a color nail enamel composition, the product may also include a thixotropic compound, a suspending agent and one or more pigments, or in the alternative, an organic coloring polymer may be used. In addition to these components, a number of optional and proprietary components are often included such as UV light absorbers, moisturizers, stabilizers, fragrances and the like.
Nail enamel compositions have heretofore been formulated in an infinite number of colors. Often, the manufacturers would produce nail enamel compositions having the same popular colors as their competitors. This provided little distinction between nail enamel products of different manufacturers to the ultimate consumer. Nail enamel compositions having a more decorative appearance were produced by including small pieces of light reflecting, decorative material known as glitters within the composition.
Other attempts to enhance the decorative appearance of nail enamel compositions has been the use of metallic pigments. By way of example, there has been known the use of metallic pigments in the nature of aluminum platelets having a controlled particle size and uniform thickness. Aluminum platelets of the foregoing characteristics which have been incorporated into nail enamel compositions are available from Avery Dennison Corporation of Pasadena, Calif. which are sold under the mark Metalure® through Obron Atlanta Corp. of Hainesville, Ohio. The aluminum platelets are supplied in a dispersion or suspension as a slurry dispersed in various solvents compatible for formulation in vehicles for rotogravure and flexographic printing inks, and in base vehicles and clear coats for spray applications.
The nail enamel composition incorporating aluminum platelets contained nitrocellulose RS ½ sec. (M.W. −56,000) as the film forming component. The films when applied over natural or synthetic human nails had a generally dull silver appearance. Although the silver appearance provided a unique and decorative look to the nail enamel composition, the dull nature detracted from its aesthetic value. The metallic appearance was further deteriorated by the inclusion of suspending agents required to support the aluminum platelets in the nail enamel composition.
Despite these known nail enamel compositions having aluminum platelets, there has heretofore been unknown nail enamel compositions which when applied to natural or synthetic human nails will produce a film having a mirrorlike appearance.
SUMMARY OF THE INVENTION
The present invention discloses a nail enamel composition having a mirrorlike appearance. The nail enamel composition includes aluminum particles in the nature of platelets which, in accordance with one example, are sold under the mark Metalure®. The Metalure® dispersions or suspensions are commercially available in eight different vehicles systems as follows:
Metalure ®
Aluminum
Solvent
Viscosity
Wt/Gal.
Product No.
N.V.M.
(1% Acetone)
(Avg.)
Lbs.
L-53520
10%
89%-Toluene
840
cps
7.8
L-54893
10%
89%-Normal
35
cps
7.9
Propyl Acetate
L-54894
10%
89%-Isopropyl
160
cps
7.75
Acetate
L-54949
10%
89%-Isopropyl
540
cps
6.61
Alcohol
L-55350
10%
89%-Ethyl
20
cps
8.1
Acetate
L-55700
10%
89%-Ektasolve ®
320
cps
8.5
(Methyl Proposol
Acetate) PM
Acetate
L-56161
10%
89%-Glycol Ether
1000
cps
8.23
PM
L-56716
10%
89%-Normal Butyl
600
cps
8.13
Acetate (NBAC)
The preferred dispersion or suspension of aluminum platelets are those dispersed in ethyl acetate, Metalure® Product No. L-55350. In addition to being dispersed in a solvent compatible in nail enamel compositions, it has a relatively low viscosity compared to the other available dispersions or suspensions. The low viscosity is preferred in view of the high molecular weight film forming components incorporated into the nail enamel composition of the present invention as to be described. However, it is to be understood that the other designated dispersions or suspensions of the aluminum platelets, and mixtures thereof, can also be incorporated into the nail enamel compositions of the present invention, including those from other sources. For example, aluminum platelets are also available from Silberline Manufacturing Co., Inc. of Tamaqua, Pa. under the mark STARDRITE 1100 EAC. The aluminum platelets are provided as a 10% dispersion in ethyl acetate. Aluminum platelets are also available from MD-Both Industries of Ashland, Mass. under the marks Metasheen NC Dispersion and Metasheen N1000 Dispersion. The aluminum platelets are provided as a 5% dispersion in a mixed organic solvent
itrocellulose base.
As previously discussed, nail enamel compositions incorporating aluminum platelets have heretofore been known. These compositions were based upon incorporation of aluminum platelets in nitrocellulose RS½ sec. as the film forming component. The percent solids in the known composition was in the range of about 25-32% by weight. The known nail enamel composition although having an aluminum color appearance did not have a mirrorlike appearance, i.e., having a dull silver appearance.
In accordance with the present invention, it has been discovered that nail enamel compositions containing aluminum platelets can be formulated to have a mirrorlike appearance. To this end, it has been discovered that by incorporating one or more film forming components into the nail enamel composition having higher molecular weights, the resulting composition will produce a film having a mirrorlike appearance. The film forming component can be selected from a variety of polymers such as those well known for use in nail enamel compositions. As a result of the higher molecular weight film forming components, the solid content of the nail enamel composition is generally lower than heretofore known, for example, in the order of about 4 to about 20% by weight.
In accordance with one embodiment of the present invention there is described a nail enamel composition of non-toxic components for forming a film over natural or synthetic human nails, the composition comprising a film forming component, a solvent and aluminum platelets, the film having a haze value greater than 932 HU. Non-toxic components include those components which are suitable for use in nail enamel compositions. Toxic compounds which are not suitable for use in nail enamel compositions include those which have been banned under state or federal law, or those which are known or suspected to be toxic to humans.
In accordance with another embodiment of the present invention there is described a nail enamel composition of non-toxic components for forming a film over natural or synthetic human nails, the composition comprising nitrocellulose having a molecular weight greater than 56,000, a solvent and aluminum platelets.
In accordance with another embodiment of the present invention there is described a method of forming a film containing aluminum platelets over natural or synthetic human nails, the method comprising coating a natural or synthetic human nail with an aqueous nail enamel composition to form a first film, and applying a nail enamel composition comprising a film forming component, a solvent and aluminum platelets over the first film to form a second film thereover, wherein the second film has a haze value when applied over the first film greater than a haze value when applied directly over said natural or synthetic human nails.
In accordance wit
Ismailer Anatoly
Socci Robert L.
Howard S.
Kirker Enterprises, Inc.
Lerner David Littenberg Krumholz & Mentlik LLP
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