Drug – bio-affecting and body treating compositions – Manicure or pedicure compositions
Reexamination Certificate
2000-03-30
2001-10-02
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Manicure or pedicure compositions
C424S401000
Reexamination Certificate
active
06296839
ABSTRACT:
The present invention is directed to a nail varnish composition comprising, in an organic solvent medium, a film-forming polymer, pyrogenic silica, a metal pigment, and an organopolysiloxane. The invention is also directed to a process for making up the nails, in particular the nails of human beings, or false nails.
Nail varnish compositions generally comprise a film-forming polymer, either dissolved in an organic solvent or dispersed in the form of particles in an aqueous medium, and a colouring material, in particular a pigment. Such varnishes are disclosed, for example, in U.S. Pat. No. 4,158,053 and French Patent Application No. A-2,578,741, the disclosures of both of which are hereby incorporated by reference.
After the application to the nail of one or more layers and then drying, these nail varnishes generally result in the formation of a smooth, continuous and homogeneous film which is glossy or matte. Some of the films obtained also exhibit good cosmetic properties, such as good hold and, in particular, good adhesion to the nail and good resistance to water, to rubbing movements, and to impacts.
With changing fashion, consumers, who are increasingly demanding, are looking for novel make-up products which confer original or specific make-up effects. A need therefore remains to have available a make-up product which, when applied to a substrate, such as human nails, skin or hair, results in a make-up effect different from those of the smooth, continuous and homogeneous films currently obtained with the commercially available products.
Furthermore, a surface coating composition which produces a film with a chased appearance on the substrate where it is applied, such as a metal surface or a surface of wood or paper, is known from U.S. Pat. No. 2,884,388, the disclosure of which is hereby incorporated by reference. The chased appearance corresponds to the aggregation of metal pigment at the surface of the film in the form of small protuberant circles which are evenly distributed and exhibit the appearance of craters. This appearance is obtained with a composition comprising, in an organic solvent medium, a film-forming polymer, a metal pigment and a specific silicone compound. The composition is applied by vaporization in the form of a spray in order to obtain the desired chased effect.
Known nail varnish compositions are usually applied using a brush and exhibit a degree of consistency (in particular of thixotropy) in order to facilitate the application and to ensure good dispersion of the colored pigments in the medium. Thus, the use of clays, such as organo-modified montmorillonites, in order to obtain a varnish of the desired consistency, is known from the published Great Britain Patent Application No. GB-A-2,021,411.
On using the silicone compound and the metal pigment, according to U.S. Pat. No. 2,884,388, in a nail varnish composition comprising montmorillonite as the sole consistency agent, the Inventors have found that the film obtained, after application to the nails, does not exhibit a chased appearance. The film remains smooth and continuous, as for a conventional nail varnish.
The aim of the present invention is to provide a fluid nail varnish composition which is easy to apply and which results, after application, in a very even chased appearance which is highly visible to the eye.
The inventors have discovered, surprisingly, that a novel type of make-up for the nails can be obtained by using a film-forming composition comprising pyrogenic silica, a metal pigment, and a specific silicone compound.
More specifically, an embodiment of the present invention is a nail varnish composition comprising, in an organic solvent medium, at least one film-forming polymer, at least one pyrogenic silica, at least one metal pigment, and at least one specific organopolysiloxane.
Another embodiment of the invention is a process for making up the nails which comprises applying, to the nails, the composition as defined above.
When the composition is applied to the nails, craters are formed at the surface of the film during the drying, resulting in the migration of the metal pigment to the edges of the craters. The craters can be of different sizes and can have a more or less regular appearance, in particular in the form of a circle or ovoid. The craters can exhibit a gentle relief or else a sloping relief similar to a cone. The tip of the cone can be open and can allow the substrate to which the composition is applied to appear. After complete drying, the film exhibits a chased appearance.
The pyrogenic silica present in the composition, in addition to its role of consistency agent and rheological agent, is not harmful to the formation of the chased appearance, in contrast to montmorillonite used alone. An original make-up is thus obtained which can exhibit both good hold, in particular to rubbing movements and to chipping, and good adhesion to the nail.
This composition can advantageously be applied as the surface product, commonly known as a top coat.
Another embodiment of the invention is a cosmetic process for making up the nails which comprises applying, to the nails, a composition as defined above.
Another embodiment of the invention is a cosmetic process for making up the nails which comprises applying, to the nails, a first layer, also known as a base layer, of a first cosmetic composition comprising, in a cosmetically acceptable medium, a first film-forming polymer and then applying, to at least part of the first layer, a second layer, also known as a surface layer, of a second cosmetic composition comprising, in an organic solvent medium, at least one second film-forming polymer, at least one metal pigment and at least one organopolysiloxane, wherein the first composition does not comprise an organopolysiloxane that is the same as the at least one organopolysiloxane in the second composition.
Another embodiment of the invention is a make-up kit comprising:
a first cosmetic composition (base layer composition) comprising, in a cosmetically acceptable medium, at least one first film-forming polymer;
a second cosmetic composition (surface layer composition) comprising, in an organic solvent medium, at least one second film-forming polymer, at least one pyrogenic silica, at least one metal pigment and at least one organopolysiloxane, wherein the first composition does not comprise an organopolysiloxane that is the same as the at least one organopolysiloxane in the second composition.
A further embodiment of the invention is made-up false nails comprising a make-up which is capable of being obtained according to the process as defined above.
The organopolysiloxane present in the surface composition has a viscosity such that a 10% solution of organopolysiloxane in xylene has a viscosity at 25° C. ranging from 0.0002 m
2
/s to 0.01 m
2
/s (20 to 1000 centistokes), preferably from 0.0005 m
2
/s to 0.005 m
2
/s (50 to 500 centistokes) and better still from 0.001 m
2
/s to 0.0015 m
2
/s (100 to 150 centistokes). The viscosity is measured according to ASTM Standard D-445 with a glass capillary tube.
The organopolysiloxane has on average from 1.99 to 2.01 hydrocarbonaceous radicals per silicon atom. At least 50% of the units of the organopolysiloxane are units of formula RMeSiO in which R is an aliphatic radical having from 1 to 3 carbon atoms, the other remaining units being units of formula R′
n
SiO
(2−n/2)
in which n has a mean value ranging from 1 to 3 and R′ is a monovalent hydrocarbonaceous radical. In the composition according to the invention, the silica/film-forming polymer ratio by weight is other than 0.0116.
R can in particular be chosen from a methyl, ethyl, propyl, vinyl, and allyl radical. The organopolysiloxane can be chosen from polydimethylsiloxanes, polyethylmethylsiloxanes, polymethylvinylsiloxanes, polymethylpropylsiloxanes, polymethylallylsiloxanes, phenylmethylpolysiloxanes and their copolymers.
The monovalent hydrocarbonaceous radical R′ can in particular be chosen from a (C
1
-C
18
) alkyl radical and in particular a methyl, ethyl
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Page Thurman K.
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