Drug – bio-affecting and body treating compositions – Manicure or pedicure compositions
Reexamination Certificate
1999-08-12
2001-07-31
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Manicure or pedicure compositions
C424S401000, C424S059000
Reexamination Certificate
active
06267950
ABSTRACT:
The present invention relates to a nail varnish comprising an aqueous dispersion of a film-forming polymer and an associative polyurethane. This varnish can be used for cosmetic or therapeutic treatment of the nails.
Patent applications EP-A-0 143 480, FR-A-2 399 238 and EP-A-0 648 485, the disclosures of each which are specifically incorporated by reference herein, describe fluid nail varnish compositions comprising an aqueous dispersion of film-forming polymer particles.
In water-born nail varnishes, the aqueous phase is routinely thickened using thickening agents. Such thickened compositions readily enable the product to harden outside its packaging without significant loss, thus the product can be evenly distributed over the zone to be treated, or the product can be used in quantities sufficient to obtain the desired cosmetic effect.
However, a such compositions are fluid, it is frequently necessary to apply two coats of the product to obtain a film which covers the nail perfectly, i.e. a film which does not show the ail through the film. Thus the provision of a nail varnish with good coverage properties is desirable.
Further, a nail varnish should have the following qualities: ease of spreading of the varnish on the ail and the production of a glossy, homogeneous film with good cosmetic properties, in particular a smooth appearance.
The aim of he present invention is to provide a nail varnish composition comprising an aqueous dispersion of film-forming polymer particles, which can be easily spread on the nail an which, after application to the nail in a single coat, can result in a perfectly glossy, homogeneous and smooth film covering the nail.
The inventors have discovered that such a composition could be obtained by adjusting the viscosity of the nail varnish composition and by using a particular thickening agent.
Thus the subject of the invention is a nail varnish composition comprising an aqueous dispersion of film-forming polymer particles, characterized in that the composition comprises at least one associative polyurethane in an effective quantity such that the composition has a viscosity of at least 2 Pa.s., measured at 23° C. at a rotation rate of 100 rpm, as explained in greater detail below.
The subject of the invention is also the use of an associative polyurethane in a nail varnish comprising an aqueous dispersion of particles of a film-forming polymer and with a viscosity of least 2 Pa.s., measured at 23° C. at a rotation rate of 100 rpm.
The subject of the invention is also the use of an associative polyurethane in a nail varnish comprising an aqueous dispersion of film-forming polymer particles, in an effective quantity such that the composition has a viscosity of at least 2 Pa.s., measured a 23° C. at a rotation rate of 100 rpm.
The subject of the invention is also the use of a composition as defined above to produce a glossy and/or homogeneous film and/or a film which gives good coverage.
The subject of the invention is also the use of a composition as defined above as a one-coat varnish.
The subject of he invention is also the use of a composition as defined above as a film-forming varnish.
The subject of the invention is also a cosmetic method or cosmetic and non therapeutic treatment for the nails consisting in applying a composition as defined above to the nails.
The inventors have found that associative polyurethanes can produce remarkable properties in nail varnishes and that other known thickening agents in varnishes with a fluid consistency do not produce these desired rheological or cosmetic properties. For example, clays such as bentonite or montmorillonite have not been found to produce viscosities of over 2 Pa.s.; cellulose polymers such as hydroxyethylcellulose have been found to produce a matt film at the desired viscosities; acrylic type thickening polymers, including associative acrylic polymers, have not been found to produce satisfactory spreading at the desired viscosities.
A nail varnish which should be easy to spread on the nail and which can produce a film with good coverage on application of a single coat may be obtained due to the associative polyurethane and the high viscosity of the composition. Further, the film should be perfect homogeneous and smooth, with no traces of brush strokes. The film obtained after drying should also have a good gloss: the gloss is 80 or more, in particular in the range 80 to 100, measured using a BYK-GARDNER gloss meter at a light beam angle of 60°.
The varnish of the invention allows a thick film to be deposited on the nail in a single coat. Further, the varnish of the invention can be perfectly suitable for use as a film-forming varnish.
The viscosity of the composition of the invention is at least 2 Pa.s. (2000 cps), preferably less than 8 Pa.s. as beyond that, the composition can no longer be applied using a brush. Advantageously, the viscosity of the composition can range from 4 Pa.s. (4000 cps) to 6 Pa.s. (6000 cps).
The viscosity can be measured with a BROOKFIELD DV-II viscometer provided with a No. 3 spindle, at a rotation rate of 100 rpm, at 23° C., the measurement being carried out after 10 minutes rotation (after which period the viscosity and the rate of rotation of the spindle are seen to stabilize). The viscosity could be measured with other suitable viscometers; one skilled in the art will know how to choose rotation rates, spindles, temperature, measurement times, and any other parameter needed to obtain the equivalent to those viscosity values obtained from the BROOKKFIELD DV-II that form part of the present invention. Other viscometers are available from vendors, including, for example, BROOKFIELD, HAAKE, AND RHEOMETRICS.
Associative polyurethanes are nonionic block copolymers comprising in the chain both hydrophilic sequences, which are usually polyoxyethylene-containing, and hydrophobic sequences which can be aliphatic concatenations alone and/or cycloaliphatic concatenations and/or aromatic concatenations.
In particular, these polymers comprise at least two hydrocarbon-containing lipophilic chains containing C
6
to C
30
carbon atoms, separated by a hydrophilic sequence, the hydrocarbon-containing chains possibly being pendent chains or chains at the end of the hydrophilic sequence. In particular, at least one pendent chain can be provided. Further, the polymer can comprise a hydrocarbon-containing chain at one or both ends of a hydrophilic sequence.
The polymers can be in the form of triblock or multiblock block polymers. The hydrophobic sequences can thus be at each end of the chain (for example: a triblock copolymer with a central hydrophilic sequence) or distributed both at the ends and within the chain (multiblock copolymer, for example). The polymers can also be graft or star polymers.
The polymers are preferably triblock copolymers in which the hydrophilic sequence is a polyoxyethylene-containing chain comprising 50 to 1000 oxyethylene groups. In general, associative polyurethanes comprise a urethane bond between the hydrophilic sequences, hence the origin of the name.
Examples of associative polymers suitable for use in the invention which can be cited are the C
16
-OE
120
-C
16
polymer sold by HULS (under the trade name Sérad FX1100, a molecule with a urethane function and a weight-average molecular weight of 1300), OE being an oxyethylene moiety. The associative polymer can also be Rheolate 205 with a urea function sold by RHEOX, or Rheolate 208 or 204. These associative polyurethanes are sold in their pure form.
DW 1206B from ROHM & HAAS with a C
20
alkyl chain and with a urethane bond, sold as 20% dry matter in water, can also be used.
It is also possible to use solutions or dispersions of these polymers, in particular in water or in an aqueous-alcoholic medium. Examples of such polymers which can be cited are Sérad FX1010, Sérad FX1035 and Sérad 1070 sold by HULS, and Rheolate 255, Rheolate 278 and Rheolate 244 sold by RHEOX. It is also possible to use DW1206F and DW1206J, as well as Acrysol RM 184 or Acrysol 44 from ROHM & HAAS, or Borchigel LW44 from BORCHERS
Bernard Pascale
de la Poterie Valerie
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Fubara Blessing
L'Oreal (S.A.)
Page Thurman K.
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