Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1998-08-27
2004-04-27
Criares, Theodore J. (Department: 1619)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S488000, C424S061000, C514S782000, C514S777000, C514S772600
Reexamination Certificate
active
06726916
ABSTRACT:
Applicant references herein the patent applications of PASCAL ARNAUD for THICKENED COMPOSITION COMPRISING FUSED SILICA and ROLAND RAMIN and PASCAL ARNAUD for MAKE-UP REMOVING COMPOSITION filed on even date herewith and incorporates the disclosures thereof specifically by reference herein.
The invention relates to a film-forming composition comprising a film-forming polymer and a novel thickener which can be used in the cosmetics field. The invention also relates to a use of this composition for the treatment and care of keratinous material such as the skin, the nails, the eyelashes, the eyebrows, the hair or mucous membranes such as the lips and the inside of the eyelids. It is intended more especially for treating and caring for the nails.
More specifically, the invention relates to a composition containing film-forming polymers, which is capable of forming a homogeneous, continuous film on a support (nail, eyelash or hair).
In film-forming compositions such as nail varnishes, it is common to thicken the organic phase with thickeners. The thickened compositions make it easier to take the product from its packaging without any significant loss, to distribute the product uniformly over the area to be treated, or alternatively to be able to use the product in sufficient amounts to obtain the desired cosmetic effect. Furthermore, for compositions comprising an amount of pigments such as nail varnishes, the thickener prevents sedimentation of the pigments during storage.
To thicken compositions, it is known to use clays such as the organomodified montmorillonites, as described in British patent application GB-A-2,021,411. However, the preparation of such compositions requires the clay to be well dispersed in the composition. Thus, the dispersion must necessarily be carried out using a Gaulin high-pressure homogenizer, which entails a restricting, long and expensive step in the manufacture of the compositions. It is thus desirable to have available a thickener which is easy to use. In addition, clays such as organomodified montmorillonites modify the properties of the film obtained when the composition is applied, since it is observed that the film has less impact strength and becomes chipped more easily.
Hydrophilic and hydrophobic silicas are also known as thickeners in nail varnishes, in particular in French patent application FR-A-1,453,089. Although silicas do not harm the properties of the film obtained once the composition is applied, they are, however, difficult to use, thus necessitating a step of placing in dispersion. Furthermore, silicas have a tendency to give a matte effect to the film-forming composition and the film obtained, leading to the formation of matte or satin films. They are thus not recommended for use for the preparation of transparent film-forming compositions and for the production of a shiny film.
An aim of the present invention is to provide a thickened, transparent, film-forming composition which is well-suited to nail care, which has good cosmetic properties and which does not have the drawbacks mentioned above.
The inventor has discovered that such a composition can be obtained by using a specific thickener.
A subject of the present invention is thus a composition comprising a film-forming polymer and an organic phase, characterized in that it comprises a polysaccharide alkyl ether formed of units containing at least two different saccharide rings, each unit containing at least one hydroxyl group substituted with a saturated hydrocarbon-based alkyl chain, the organic phase comprising at least one medium which is a solvent for the polysaccharide alkyl ether.
By virtue of the polysaccharide alkyl ether, the composition according to the invention is transparent and has a satisfactory viscosity which allows good spreading of the composition. This thickener is entirely suitable for the preparation of pigmented compositions that are stable over time, such as nail varnishes.
In the thickener of the invention, the term “hydrocarbon-based alkyl chain” is understood to refer to a linear or branched chain preferably containing from 1 to 24, more preferably from 1 to 10, better still from 1 to 6 and more especially from 1 to 3, carbon atoms. In particular, the alkyl chain is selected from ethenyl and propenyl and preferably from saturated chains and in particular methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl and n-pentyl. These alkyl ethers can be manufactured as described in documents EP-A-281,360 and EP-A-708,114, the disclosures of which are specifically incorporated herein by reference.
According to a preferred embodiment of the invention, the polysaccharide alkyl ether has a weight-average molecular weight of greater than 100,000, and preferably greater than 200,000. This molecular weight can be up to 1 million. This alkyl ether preferably contains from 1 to 6, and better still from 2 to 4, hydroxyl groups per unit, substituted with a saturated or unsaturated hydrocarbon-based alkyl chain.
The saccharide rings are selected in particular from mannose, galactose, glucose, furanose, rhamnose and arabinose.
According to a preferred embodiment of the invention, the polysaccharide alkyl ether is an alkyl ether of a gum and more particularly of a gum which is nonionic overall, i.e. one which contains few or no ionic groups. As appropriate gums, mention may be made, for example, of guar gum, in which the unit comprises a galactose and a mannose, carob gum, in which the unit comprises a galactose and a mannose, karaya gum, which is a complex mixture of rhamnose, galactose and galacturonic acid, and gum tragacanth, which is a complex mixture of arabinose, galactose and galacturonic acid.
According to a preferred embodiment of the invention, the polysaccharide alkyl ether is a guar gum derivative. Thus, advantageously, the alkyl ether is an alkyl galactomannan with a C
1
to C
6
, and better still C
1
to C
3
, alkyl chain and more particularly ethyl guar having a degree of substitution of from 2 to 3 and in particular from about 2.5 to 2.8, as described in the documents RD 95378007 (October 1995) and EP-A-708,114, the disclosures of which are specifically incorporated by reference herein. This gum is sold in particular by the company Aqualon under the names N-HANCE-AG 200® and N-HANCE AG 50®.
The concentration of alkyl ether depends on the pharmaceutical form and the consistency desired for the composition, as well as on the amount of organic phase to be thickened. In particular, the weight ratio of the amount of liquid fatty phase to the amount of thickener is selected, for example, preferably in the range from 5 to 500. The composition according to the invention can contain, for example, an amount of polysaccharide alkyl ether preferably ranging from 0.2 to 20% of the total weight of the composition, and more preferably from 1.5 to 8%.
According to the invention, the medium which is a solvent for the polysaccharide alkyl ether present in the composition can be an organic solvent or an oil. In other words, the polysaccharide alkyl ether is a thickener for the organic solvents and the oils. The term oils is understood to refer to any fatty substance which is liquid at room temperature.
The organic solvent can be selected, for example, from:
ketones that are liquid at room temperature, such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, isophorone, cyclohexanone and acetone;
alcohols that are liquid at room temperature, such as ethanol, isopropanol, diacetone alcohol, 2-butoxyethanol and cyclohexanol;
glycols that are liquid at room temperature, such as ethylene glycol, propylene glycol and pentylene glycol;
propylene glycol ethers that are liquid at room temperature, such as propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate and dipropylene glycol mono-n-butyl ether;
esters with a short chain, (having from 3 to 8 carbon atoms in total), such as ethyl acetate, methyl acetate, propyl acetate, n-butyl acetate and isopentyl acetate;
ethers that are liquid at room temperature, such as diethyl ether, dime
Criares Theodore J.
Finnegan Henderson Farabow Garrett & Dunner LLP
L'Oreal (S.A.)
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