Drug – bio-affecting and body treating compositions – Manicure or pedicure compositions
Reexamination Certificate
1999-11-05
2001-12-25
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Manicure or pedicure compositions
C424S401000
Reexamination Certificate
active
06333025
ABSTRACT:
The present invention relates to the use of at least one cellulose ester for reducing the drying time of nail varnish compositions comprising nitrocellulose.
Nail varnish compositions generally comprise a film-forming polymer dissolved in an organic solvent medium. Film-forming polymers commonly used in these compositions include nitrocellulose. These compositions are generally applied as one or more coats to the surface of the nail, leading, after drying, to the formation of a film on the nail.
However, just after they have been applied, the coats of nail varnish can be damaged or degraded by contact, friction or touching foreign bodies such as, for example, clothing. Thus, it is desirable for these varnishes to dry quickly after they have been applied.
One method of improving the speed of drying of nail varnishes is the use of specific solvents. According to U.S. Pat. No. 5,424,061, acetone in combination with another co-solvent can be used to improve the speed of drying of nail varnish compositions. This combination, however, has as a constraint a limitation on the formulation of the nail varnish. Furthermore, solvents which are too volatile may be detrimental to the quality of the make-up effect obtained because defects may appear when applying the nail varnish. For example, lines may form on the coat of varnish, or the brush may dry excessively quickly during application. As a result, an inhomogeneous varnish coating is obtained that is not sufficiently smooth, lacks gloss, and has unsatisfactory staying power.
Another method of improving the speed of drying of nail varnishes is the use of specific additives. According to European Patent Application Number EP-A-432,572, silicone compounds can be used to improve the speed of drying of nail varnishes. European Patent Application Number EP-A-432,572 exemplifies combining other film-forming polymers with nitrocellulose to modify the cosmetic properties of the film of nail varnish.
Accordingly, an object of the present invention is to obtain a nitrocellulose-based nail varnish composition which has improved drying properties without using specific additives or solvents.
The inventor has discovered that the combination of nitrocellulose and at least one cellulose ester, in certain proportions, makes it possible to obtain a nail varnish with a drying time that is shorter than the drying time of similar compositions containing only nitrocellulose, or containing only cellulose ester as a film-forming polymer.
Contrary to the teaching of Example 4 of European Patent Application EP-A-432,572, which describes a nail varnish that has poor drying properties and which comprises nitrocellulose, an alkyd resin, and cellulose acetobutyrate, the inventor has discovered that the combination of nitrocellulose and cellulose acetobutyrate in a specific amount can have a synergistic effect on the drying time of the nail varnish composition.
Therefore, a subject of the invention is the use of a cellulose ester in a nail varnish composition comprising, in a solvent medium, a polymer system containing nitrocellulose; an additional film-forming polymer in an amount up to 50% by weight, relative to the total weight of nitrocellulose and cellulose ester; and a dyestuff in an amount which is sufficient to dye the composition, the cellulose ester being present in a synergistic amount relative to the amount of nitrocellulose effective for reducing the drying time of the composition.
The cellulose ester used according to the invention can comprise acyl groups chosen from R-CO- groups in which R is chosen from linear and branched alkyl radicals containing from 1 to 3 carbon atoms. For example, the cellulose ester can be chosen from cellulose acetates, cellulose acetopropionates, and cellulose acetobutyrates.
In an embodiment of the invention, the cellulose ester is chosen from cellulose acetobutyrates and cellulose acetopropionates.
Cellulose acetobutyrates can comprise a weight content of acetate groups ranging from 1 to 18% and a weight content of butyrate groups ranging from 30 to 60%. Cellulose acetobutyrates (referred to as CABs) which may be used in accordance with the invention are those sold under the names “CAB-551”, “CAB-500”, “CAB-553”and “CAB-381” by the company Eastern Chemical.
The weight contents of acetate and butyrate groups in these compounds are as follows:
CAB product
Acetate content in %
Butyrate content in %
CAB-551
2
53
CAB-500
5
49
CAB-553
2
47
CAB-381
13
37
Cellulose acetobutyrates can be present in the nail varnish composition of the invention in a weight content ranging from 10% to 80% by weight relative to the total weight of cellulose ester and nitrocellulose.
In an embodiment of the invention, when the weight content of acetate groups is less than or equal to 5%, the cellulose acetobutyrate is present in the nail varnish composition in an amount ranging from 10% to 30% by weight, relative to the total weight of cellulose ester and nitrocellulose. In another embodiment of the invention, when the weight content of acetate groups is less than or equal to 5%, the cellulose acetobutyrate is present in the nail varnish composition in an amount ranging from 12.5% to 25% by weight, relative to the total weight of cellulose ester and nitrocellulose.
In yet another embodiment of the invention, when the weight content of acetate groups is greater than or equal to 10%, the cellulose acetobutyrate is present in an amount ranging from 20% to 80% by weight, relative to the total weight of cellulose ester and nitrocellulose present in the composition. In a further embodiment of the invention, when the weight content of acetate groups is greater than or equal to 10%, the cellulose acetobutyrate is present in an amount ranging from 25% to 75% by weight, relative to the total weight of cellulose ester and nitrocellulose present in the composition.
Cellulose acetopropionates can comprise a weight content of acetate groups ranging from 1 to 5% and a weight content of propionate groups ranging from 35 to 50%. Cellulose acetopropionates (referred to as CAPs) the company Eastman Chemical. which may be used are those sold under the names “CAP-482-0.5”, “CAP-482-20” and “CAP-504” by the company Eastman Chemical.
The weight content of acetate and propionate groups in these compounds are as follows:
CAP product
Acetate content in %
Propionate content in %
CAP-482-0.5
2.5
44
CAP-482-20
2.5
46
CAP-504
2.5
40
The nitrocellulose used according to the invention can be chosen from nitrocellulose RS ⅛ sec.; RS ¼ sec.; RS ½ sec.; RS 5 sec.; RS 15 sec.; RS 35 sec.; RS 75 sec.; RS 150 sec.; AS ¼ sec.; AS ½ sec.; SS ¼ sec.; SS ½ sec.; and SS 5 sec., sold in particular by the company Hercules.
In an embodiment of the invention, cellulose acetopropionates can be present in the nail varnish composition in an amount ranging from 10% to 80% by weight, relative to the total weight of cellulose ester and nitrocellulose present in the composition. In another embodiment of the invention, cellulose acetopropionates can be present in the nail varnish composition in an amount ranging from 12.5% to 75% by weight, relative to the total weight of cellulose ester and nitrocellulose present in the composition.
Nitrocellulose can be present in the composition in an amount ranging from 1.5 to 35% by weight relative to the total weight of the composition. In another embodiment, the nitrocellulose can be present in the composition in an amount ranging from 8% to 20% by weight, relative to the total weight of the composition.
According to an embodiment of the invention, the only film-forming polymers present in the composition are nitrocellulose and cellulose ester, as defined above.
According to another embodiment of the invention, the composition comprises at least one film-forming polymer in addition to the nitrocellulose and cellulose ester, at least to improve the cosmetic and physicochemical properties of nail varnish film.
The at least one additional film-forming polymer can be chosen from polyvinyl butyrals, alkyd resins, resins
Di Nola-Baron Liliana
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal
Page Thurman K.
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