FR2940049A1 - SOFT ARTICLE FOR POLYMERIC LAYER NAILS COMPRISING A NATURAL LATEX - Google Patents

Abstract

Flexible article to be applied on nail and/or false nail for its makeup and/or care, comprises at least one adhesive layer, where the adhesive layer comprises at least one resin or natural rubber, at least one plasticizer and at least one polysaccharide or polysaccharide derivative. An independent claim is included for a product for makeup and/or care of nails and/or false nails comprising the article in packaging in substantially airtight, where the packaging is such that the article is preserved in a partially dry form.

Description

The present invention relates to a flexible article intended to be applied to the nails for their makeup and / or care. Conventionally, the makeup of nails or false nails is made using liquid makeup compositions, still commonly called nail polish.

This nail polish is generally applied in the form of layers superimposed on the surface of the nail makeup, respecting an intermediate drying step between each layer of varnish applied. In fact, this mode of makeup is not completely satisfactory. First, its application requires a certain amount of time.

In addition, conventional nail polish formulas generally involve the use of volatile solvents which generate, during application, an uncomfortable odor. An alternative has been to develop nail polish compositions based on dispersion of polymers in the aqueous phase, and therefore satisfactory on the olfactory plane. Unfortunately, the mode of application is still restrictive, and moreover the corresponding varnishes prove to have insufficient durability over time. Yet another alternative has been to develop adhesive adjustable patches in the form of an adhesive laminate or flexible article comprising an adhesive layer and a polymeric layer. This alternative is described in particular in US 5,415,903 and WO 2005/112874. However, the adhesive layers of these different articles generally have a surface tack too high, not allowing to reposition the article on the nail if it was not correctly positioned initially. The present invention aims precisely to provide a method of makeup and / or care of nails or false nails having a sticky power adapted to allow the article to be peeled off and then repositioned on the nail if necessary. The present invention relates, according to a first of its aspects, to a flexible article intended to be applied to the nails and / or false nails for their makeup and / or their care, especially in the form of an adhesive laminate, comprising at least one layer adhesive, characterized in that said adhesive layer comprises at least one natural resin or gum, at least one plasticizer, and at least one polysaccharide or a polysaccharide derivative.

According to a second aspect, the present invention relates to a makeup product and / or care of nails and / or false nails for their makeup and / or care, comprising in a substantially airtight packaging, at least one article according to the invention, the packaging being such that the article is kept there in a partially dry form. This flexible article is named for the sake of simplicity, in the remainder of the description, partially dry flexible article. According to this aspect of the invention, the partially dry flexible article acquires a completely dry appearance, and therefore its final shape, after application to the nail and drying, by simple exposure to the ambient air. According to a third aspect, the present invention relates to a process for makeup and / or care of nails and / or false nails comprising at least one step of applying to a natural nail and / or false nail, a flexible article according to the invention whether it is considered dry or partially dry. According to one embodiment, the flexible article according to the present invention may be in various forms such as a star, a square, a round, etc. Within the meaning of the present invention, the term partially dry intends to qualify the fact that the article obtained after formation of the film is not completely free of the residual solvent. In particular, it has a dry matter content of greater than 80%, more particularly greater than 85% and less than 95% by weight relative to its total weight. In contrast, the flexible article according to the invention, which is the subject of the first aspect of the invention mentioned above, is called flexible article in the dry state. Alternatively, the article may further comprise a polymeric layer or a succession of polymeric layers.

FLEXIBLE ARTICLE In general, the article according to the present invention is in the form of a film or laminate. Within the meaning of the present invention, the term flexible describes a sufficient flexibility of this film, that is to say, conducive to stretch-like mechanical deformations to adjust it to the surface of a fingernail.

Furthermore, it should also be understood that soft means that it is able to deform non-elastically so as to conform to the more or less curved profile of the nail. This deformability is characterized in particular by the Er deformation parameter Er discussed below. The article according to the invention differs in this respect from a false nail type article, which is characterized by a rigidity incompatible with such a mechanical deformation. Another difference between the article according to the invention and a false nail lies in the sensitivity of this article vis-à-vis the polar organic solvents such as acetone, ester and / or short alcohol, such as alkyl acetates , especially ethyl acetate. Indeed, the article of the invention can be easily removed by removing make-up using a conventional solvent or solvent, as opposed to a false nail that is withdrawn. The invention also relates to an article capable of being cleansed with a solvent selected from acetone, alkyl acetates such as ethyl acetate, and mixtures thereof. In all these respects, the flexible article according to the invention is distinguished on the one hand from conventional liquid nail varnish type compositions because of its partially dry structure, and on the other hand from solid products such as false nails, by the fact that said article before application is mechanically deformable and can remove makeup, unlike a false nail which is affixed directly to the nail and then filed to be adjusted and then removed directly from the nail to find a fingernail in the normal state. The article according to the invention can be used for makeup purposes, in which case it comprises dyestuffs, or for protection purposes vis-à-vis a lacquer film. In this alternative, the polymeric layer is generally transparent. The subject of the invention is also a flexible article intended to be applied to the nails and / or false nails for their make-up and / or care, in particular in the form of an adhesive laminate, comprising at least one adhesive layer, characterized in that said adhesive layer comprises at least one natural resin or gum, at least one plasticizer, and at least one polysaccharide or polysaccharide derivative, and further comprising at least one polymeric layer.

In particular, the flexible article may further comprise a protective film in contact with the first face of the adhesive layer, to be removed prior to the establishment of the article on the nail. Preferably the face of the protective film in contact with the first face of the sheet is covered with a non-adhesive material, in particular silicone. According to a particular embodiment, the article according to the invention is coated on both sides with a removable film, identical or different. According to one embodiment, the flexible article according to the present invention has a thickness ranging from 6 m to 1 mm, in particular from 10 m to 500 m, and even more particularly from 50 m to 200 m. The thickness referred to is the thickness before application to the nail of the entire structure inseparable to one or more layers including the adhesive layer. In particular, thickness refers to the thickness of all the polymeric and adhesive layers. On the other hand, any structure removably attached to the flexible article, in particular a protective film on one or other of the faces of the article, in particular, a silicone film on the adhesive side of the article. , does not come into play in the measurement of thickness. The flexible article, and in particular the excess, may be pre-cut or cut, before or after its application, depending on the desired size and shape with small scissors, a nail cut or scraping film. The flexible article or flexible article in the dry state according to the invention is in particular in the form of a non-liquid film which can be characterized by a high solids content. Indeed, the amount of dry matter in this article in the dry state, namely once applied to the nail or false nails, is greater than or equal to 95% by weight relative to the total weight of the article. In other words, the amount of volatile solvent is less than or equal to 5% by weight relative to the total weight of the article. The makeup product according to the second aspect mentioned above comprises an article in partially dry form. In this particular case, the makeup product is packaged in a reservoir such as a pocket, flexible or not, sufficiently sealed to preserve this partially dry appearance. It is only at the time of its use and therefore when it comes into contact with the air, that the product dries completely to acquire the content of dry matter described above, in accordance with the article according to the invention. . As mentioned above, in a product according to the invention, the partially dry article advantageously has a solids content greater than 80%, more particularly greater than 85%, and less than 95% by weight relative to its total weight. Such an article, when extracted from the packaging of a product according to the invention and exposed to ambient air, acquires a dry state as defined above at the end of 24 hours. Preferably, the amount of dry matter, commonly referred to as dry extract of the articles according to the invention, is measured by heating the sample with infrared rays of 2 m to 3.5 m wavelength. Substances contained in said films which have a high vapor pressure, evaporate under the effect of this radiation. The measurement of the weight loss of the sample makes it possible to determine the dry extract of the article. These measurements are carried out using a Mettler LP16 commercial infrared desiccator. This technique is perfectly described in the documentation of the device supplied by Mettler. The measurement protocol is as follows: About 10 g of sample of an article are deposited on a metal cup. This, after introduction into the desiccator, is subjected to a temperature of 120 ° C for one hour. The wet mass of the sample, corresponding to the initial mass and the dry mass of the sample, corresponding to the mass after exposure to radiation, are measured by means of a precision balance. The dry matter content is calculated as follows: Dry extract = 100 x (dry mass / wet mass).

The article according to the invention may advantageously be characterized in the dry state by a water recovery brought to 25 ° C. of less than or equal to 20%, in particular less than or equal to 16%, and in particular less than 10%.

According to the present application, the term "water repetition" is understood to mean the percentage of water absorbed by the article after 60 minutes of immersion in water at 25 ° C. (room temperature). The water recovery is measured for pieces of about 1 cm cut in the dry article. They are weighed (measurement of mass Ml) and then immersed in water for 60 minutes; immersion, the piece of film is wiped to remove excess surface water and then weighed (measurement of mass M2). The difference M2 - Ml corresponds to the amount of water absorbed by the film. The water uptake is equal to [(M2-M1) / M1] × 100 and is expressed as a weight percent based on the weight of the film.

Conservation module E 'Moreover, the article according to the invention is advantageously a film having a conservation modulus E' greater than or equal to 1 MPa, in particular ranging from 1 MPa to 5000 MPa, in particular greater than or equal to 5 MPa , in particular ranging from 5 to 1000 MPa, and more particularly greater than or equal to 10 MPa, for example ranging from 10 to 500 MPa at a temperature of 30 ° C. and a frequency of 0.1 Hz. The measurement of the conservation module is carried out by DMTA (Dynamic and Mechanical Temperature Analysis).

Viscoelasticimetry tests were performed with a TA Instruments Polymer DMTA (model DMA2980) on a sample of the article. The test pieces are cut (for example by punching). These typically have a thickness of about 150 m, a width of 5 to 10 mm and a useful length of about 10 to 15 mm. The measurements are made at a constant temperature of 30 ° C.

The sample is biased in tension and in small deformations (it imposes for example a sinusoidal displacement of 8 m) during a sweep in frequency, the frequency ranging from 0.1 to 20 Hz. One thus works in the linear domain under low levels of deformation. These measurements make it possible to determine the complex module E * = E '+ iE "of the film of composition under test, E' being the conservation module and E" the so-called loss module.

Deformation and / or Energy at Break Advantageously, the articles according to the invention have a breaking strain Er greater than or equal to 5%, in particular ranging from 5 to 500%, preferably greater than or equal to 15%, especially ranging from from 15 to 400% and / or a rupture energy per unit volume W greater than or equal to 0.2 J / cm 3, in particular ranging from 0.2 to 100 J / cm 3, preferably greater than 1 J / cm 3, in particular ranging from 1 to 50 J / cm3. The breaking strain and breaking energy per unit volume are determined by tensile tests on a crosslinked film approximately 200 m thick.

To perform these tests, the article is cut into test dumbbells of useful length 33 1 mm and 6 mm useful width. The section (S) of the test piece is then defined as: S = width x thickness (cm2); this section will be used for the calculation of the constraint. The tests are carried out, for example, on a traction device marketed under the name Lloyd LR5K. The measurements are carried out at ambient temperature (20 ° C.). The specimens are stretched at a movement speed of 33 mm / min, corresponding to a speed of 100% elongation per minute. A speed of displacement is thus imposed and the elongation AL of the specimen and the force F necessary to impose this elongation are measured simultaneously. It is from these data AL and F that the stress parameters 6 and strain E are determined. Thus, a stress curve 6 = (F / S) is obtained as a function of the strain c = (AL / Lo ) x 100, the test being conducted until rupture of the test piece, Lo being the initial length of the test piece. The breaking strain Er is the maximum deformation of the sample before the breaking point (in%). The breaking energy per unit volume Wr in J / cm3 is defined as the area under this stress / strain curve such that: r Wr = fG.E.de o According to a preferred embodiment, the flexible article according to the invention comprises more than 80% by weight of compounds of natural origin relative to the total weight of said article, in particular more than 90% by weight, preferably more than 95% by weight, or even consists exclusively of compounds of natural origin.

ADHESIVE LAYER The article according to the invention has an adhesive outer face. Such an adhesive face is generally obtained thanks to the presence of at least one adhesive layer, characterized in that this adhesive layer comprises at least one natural resin or gum, at least one plasticizer, and at least one polysaccharide or derivative of polysaccharide. The combination of at least one resin or a natural gum with at least one plasticizer and a polysaccharide or polysaccharide derivative, must have a certain tackiness defined by its viscoelastic properties.

The viscoelastic properties of a material are conventionally defined by two characteristic values which are as follows: the elastic modulus which represents the elastic behavior of the material for a given frequency and which is classically denoted by G '; the viscous modulus which represents the behavior viscous material 20 for a given frequency and which is classically noted G. "These quantities are defined in particular in the Handbook of Pressure Sensitive Adhesive Technology, 3d edition, D. Satas, chapter 9, pp. 155-157. Preferably, the adhesive materials usable according to the present invention have viscoelastic properties which are measured at a reference temperature of 35 ° C. and in a certain frequency range In the case of adhesive materials in the form of a solution or dispersion of polymer in a volatile solvent (such as water, a short ester, a short alcohol, acetone, etc.), I am the viscoelastic properties of this material under conditions in which it has a volatile solvent content of less than 30%, and in particular a volatile solvent content of less than 20%. In particular, the elastic modulus of the material is measured at three different frequencies: at a low frequency, ie at 2.10.2 Hz; at an intermediate frequency, ie at 0.2 Hz; - at high frequency, ie at 2 Hz, and - the viscous module at the frequency of 0.2 Hz.

These measurements make it possible to evaluate the evolution of the adhesive power of the adhesive material over time. These viscoelastic properties are measured during dynamic tests under low amplitude sinusoidal stresses (small deformations) carried out at 35 ° C over a frequency range from 2.10- to 20 Hz on a Haake RS50 rheometer under a torsion stress. shear, for example in cone-plane geometry (for example with a cone angle of 1 °). Advantageously, said adhesive material meets the following conditions: G '(2 Hz, 35 ° C)> 103 Pa, and - G' (35 ° C) <10 Pa, in particular G '(35 ° C) <10 Pa, - G '(2.10.2 Hz, 35 ° C) <3.105 Pa, in which: - G' (2 Hz, 35 ° C) is the elastic modulus of shear of said adhesive material, measured at the frequency of 2 Hz and at the temperature of 35 ° C, - G '(35 ° C) is the elastic shear modulus of said adhesive material, measured at a temperature of 35 ° C, for any frequency between 2. 10.2 and 2 Hz, - G '(2.10.2 Hz, 35 ° C) is the elastic shear modulus of said adhesive material, measured at a frequency of 2.10-2 Hz and at a temperature of 35 ° C. In a particular form of the invention, the adhesive material also satisfies the following condition: - G "/ G '(0.2 Hz, 35 ° C.)> 0.35, in which: - G" (0.2 Hz, 35 ° C) is the viscous shear modulus of said adhesive material, measured at a frequency of 0.2 Hz and at a temperature of 35 ° C, - G '(0.2 Hz, 35 ° C) is the modulus shear elastic of said adhesive material, measured at a frequency of 0.2 Hz and at a temperature of 35 ° C. In a particular form of the invention, there is: - G '(2 Hz, 35 ° C)> 5.103 Pa, and in particular, G' (2 Hz, 35 ° C)> 104 Pa.

In another particular form of the invention, there is: - G '(2.10.2 Hz, 35 ° C.) <5.104 Pa. In particular, the adhesive materials according to the invention satisfy the following four conditions: 2 Hz, 35 ° C)> 104 Pa, and - G '(35 ° C) <108 Pa, in particular G' (35 ° C) <10 'Pa, - G' (2.10.2 Hz, 35 ° C ) <5.104 Pa, and - G "/ G '(0.2 Hz, 35 ° C)> 0.35.

Resin or Eraser A flexible article according to the invention comprises at least one adhesive layer which comprises at least one natural resin or gum. For the purposes of the invention, the term resin or natural gum, a resin or a natural gum that is obtained directly from plants and having not undergone any chemical modification after extraction. The natural gums or resins according to the invention are preferably selected from: rosin or its derivatives, terpene resins, shellac, sandaraque gum, dammars, elemi, copals, benzoin , putty gum, and - mixtures thereof. Rosin is a mixture comprising mainly organic acids called rosin acids (mainly abietic and pimaric type acids). 25 There are three types of rosin: rosin (gum rosin) obtained by incision on living trees, wood rosin extracted from stumps or pine wood, and tall oil (tall oil). rosin) which is obtained from a by-product from the production of the paper. The rosin derivatives may be derived in particular from the polymerization, hydrogenation and / or esterification (for example with polyhydric alcohols such as ethylene glycol, glycerol, pentaerythritol) of rosin acids. There may be mentioned, for example, the rosin esters marketed under the reference FORAL 85, PENTALYN H and STAYBELITE ESTER 10 by the company HERCULES; SYLVATAC 95 and ZONESTER 85 by ARIZONA CHEMICAL or UNIREZ 3013 by UNION CAMP. The terpene resins are typically derived from the polymerization of at least one monomer selected from α-pinene, (3-pinene, limonene, and mixtures thereof) These resins may have a molecular weight ranging from 300 to 2000 g / mol. Such resins are sold for example under the name PICCOLYTE A115 and S125 by the company Hercules, ZONAREZ 7100 or ZONATAC 105 LITE by the company ARIZONA Chem.

The flexible article according to the present invention may comprise at least one, and in particular at least two natural gums or resins. According to a particular embodiment, the adhesive layer according to the invention comprises from 0.1 to 90%, especially from 30 to 80% and more particularly from 40 to 70% by weight of natural resin or gum relative to the total weight. of the dry extract of the adhesive layer. Preferably, the gum or natural resin is sandaraque gum, benzoin, or elemi. Advantageously, the article comprises gum elemi in a content ranging from 40% to 60% by weight relative to the total weight of the dry extract of the adhesive layer.

Plasticizer A flexible article according to the invention comprises at least one adhesive layer which comprises at least one plasticizer. The plasticizers according to the invention are preferably selected from optionally modified compounds of natural origin, such as oils comprising at least one fatty acid chosen from caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, rinoleic acid, linoleic acid, linolenic acid, arachidic acid, gadoleic acid, behenic acid, erucic acid, brassic acid, cetoleic acid, lignoceric acid, nervonic acid and a mixture thereof, and in particular the oils comprising a caprylic and capric acid mixture.

In particular, the oils that are suitable for the implementation of the invention are chosen from triglycerides consisting of esters of fatty acids and of glycerol, the fatty acids of which can have various chain lengths of C4 to C24, the latter being able to be linear or branched, saturated or unsaturated. These oils include heptanoic or octanoic triglycerides, peanut oil, babassu oil, coconut oil, grape seed oil, cotton oil, corn oil, corn germ oil, mustard seed oil, palm oil, rapeseed oil , sesame, soya, sunflower, wheat germ, canola, apricot, mango, castor, shea, avocado, olive, sweet almond, peach almond, walnut, hazelnut, macadamia, jojoba, alfalfa, poppy, pumpkin, squash, blackcurrant, evening primrose, millet, barley, quinoa, rye, safflower, bancoulier, passionflower, rose hip, shea butter or triglycerides caprylic / capric acids, and mixtures thereof. According to one particular embodiment, the adhesive layers according to the invention comprise from 0.1 to 70% by weight, in particular from 5 to 60% by weight, and more particularly from 10 to 50% by weight of plasticizer relative to the weight. total dry extract of the adhesive layer. According to one embodiment of the invention, the flexible article comprises a caprylic and / or capric acid ester or a caprylic and / or capric alcohol ester as a plasticizer, said ester being of plant origin.

Caprylic and / or capric acid or alcohol is understood to mean carboxylic acids or linear or branched, preferably linear, alcohols having 8 or 10 carbons. For the purposes of the invention, the term "ester of plant origin" means an ester which is obtained from plant raw materials or from plant origin.

This ester may correspond to one of the following formulas (I) to (X): (I) CH2O C (O) R3 R1-C (O) -OCH2-C (CH3) 2CH2O-C (O) -R2 ( ## STR1 ## wherein 0) -R2 (IV) CH2C (O) ùO ùRI (V) R4 wherein CC (O) -OR R2 CH2C (O) ùO ùR3 R7-OC (O) -R1 (VI) CH3- (CH2) 5-CH (CH3) OC (O) -Ri (VII) R6-OC (O) -Ri (VIII) R7-OC (O) -R6 (IX) R7-OC (O) - (CH2) 8-C (O) -O-R8 (X)

in which: R1, R2, R3, which may be identical or different, represent a hydrogen atom or a linear or branched, preferably linear, saturated alkyl chain containing 7 or 9 carbon atoms, R4 represents the hydrogen atom; or a group (Alk) -C (CO) -, in which (Alk) represents a linear or branched alkyl chain comprising between 1 and 5 carbon atoms, R6 represents a linear or branched alkyl chain, substituted or unsubstituted, comprising between 1 and 18 carbon atoms, in particular between 1 and 10, or a linear or branched, substituted or unsubstituted alkenyl chain, comprising between 2 and 18 carbon atoms, in particular between 2 and 10. Y is an ethoxy, isopropoxy group or propoxy, and d is between 1 and 1000, in particular between 1 and 15, in particular equal to 1. R7, R8, identical or different, represent a linear or branched, preferably linear, saturated alkyl chain at 8 or 10 carbon atoms, The ester according to the invention may also comprise a mixture of different esters defined above.

Such esters are commercially available, for example from Cognis or RTD Hallstar. According to a preferred embodiment of the invention, this plasticizer may especially be a compound of formula (I) as defined above, or in other words a caprylic and / or capric acid triglyceride. According to another preferred embodiment of the invention, this plasticizer may in particular be a compound of formula (VII) as defined above, or in other words a caprylate and / or isooctyl caprate. Advantageously, the article comprises caprylic / capric acid triglycerides in a content ranging from 20 to 40% by weight of acid relative to the total weight of the dry extract of the adhesive layer. Polysaccharides and Polysaccharide Derivatives A flexible article according to the invention comprises at least one adhesive layer which may comprise at least one polysaccharide or polysaccharide derivative, chosen in particular from alkyl ethers or polysaccharide esters. By polysaccharide ester or alkyl ether, is meant in the sense of the invention a polysaccharide formed of repeating units comprising at least two identical or different rings and having a degree of substitution per saccharide unit of between 1.9 and 3, preferably included. between 2.2 and 2.9, and more particularly between 2.4 and 2.8. By substitution, the functionalization of the hydroxyl groups into ester and / or alkyl ether functions and / or the functionalization of the carboxylic groups into ester functions is designated by substitution. In other words, the invention denotes a polysaccharide, partially or totally substituted with ester and / or alkyl ether groups. The hydroxyl groups may preferably be substituted with C2-C4 ester and / or alkyl ether functions.

The saccharide units may in particular be chosen from mannose, galactose, glucose, furanose, rhamnose, arabinose, xylose, fucose, glucuronic acid, mannuronic acid, and galacturonic acid. Suitable compounds include esters and / or alkyl ethers of cellulose whose unit consists of glucose, esters and / or alkyl ethers of guar or locust bean whose units consist of galactose and mannose, esters and / or or alkyl ethers of konjac whose pattern consists of glucose and mannose, and esters and / or alkyl ethers of tamarind whose pattern consists of galactose, xylose, and glucose.

In particular, alkyl ethers and cellulose or guar esters are mentioned. More particularly, cellulose acetobutyrates, cellulose acetopropionates, ethylcelluloses, and ethylguars are more particularly mentioned. As polysaccharide ester or alkyl ether, mention may be made especially of those sold under the trade names AQUALON by the company HERCULES, ETHOCEL by the company DOW, and under the names CAP and CAB by the company Eastman. The cosmetic composition according to the present invention may comprise at least one, and in particular at least two alkyl ethers and / or polysaccharide esters. According to one particular embodiment, the flexible article according to the invention comprises at least 5% by weight of polysaccharide ester or alkyl ether, preferably at least 10%, or even at least 15% by weight relative to the total weight. of the dry matter of the adhesive layer. According to a particular embodiment, the flexible article according to the invention comprises from 5 to 60% by weight, in particular from 10 to 30% by weight, in particular from 10 to 20% by weight of polysaccharide or polysaccharide derivative relative to to the total weight of the dry matter of the adhesive layer. In particular, the polysaccharide or polysaccharide derivative is ethylguar. Advantageously, the article comprises ethylguar in a content ranging from 10 to 20% by weight relative to the total weight of the dry extract of the adhesive layer. Preferably, the adhesive layer according to the invention comprises more than 80% by weight, preferably more than 90% by weight, preferably more than 95% by weight, preferably the adhesive layer exclusively comprises compounds of natural origin relative to the total weight of the dry extract of the adhesive layer. The adhesive layer in the article according to the invention is generally in the form of a layer having a thickness of from 5 to 100 m, in particular from 10 to 80 m, preferably from 15 to 50 m, preferably from 20 to 30 m.

THE POLYMERIC LAYER In addition to the adhesive layer, the article according to the present invention may comprise at least one polymeric layer, in particular comprising at least one polysaccharide or polysaccharide derivative, or at least one latex of natural origin, preferably a natural latex of polyisoprene.

Polysaccharides or polysaccharide derivatives The definitions of the polysaccharides or polysaccharide derivatives given above and relating to the adhesive layer are valid when they are used in the polymeric layer. According to one preferred embodiment of the invention, the polysaccharides or polysaccharide derivatives in accordance with the invention are chosen from compounds such as an ester or a cellulose alkyl ether, preferably a cellulose acetate butyrate, a cellulose acetate propionate, and the like. ethylcellulose or ethylguar. Advantageously, the article comprises polysaccharides or polysaccharide derivatives in a content ranging from 30% to 100% by weight of polysaccharides or polysaccharide derivatives relative to the total weight of the solids content of the polymeric layer, in particular of 50 to 100% by weight. Natural Latex According to another preferred embodiment of the invention, the natural latex of polyisoprene is chosen from latex rubber, Parthernium Argentatum (guayule), solidago virgaurea minuta, Taraxacum koksaghyz, Gutta percha, Gutta balata, sapodilla, and their mixture. Preferably, the latex is deproteinized to reduce the risk of allergies. Preferably, the polymeric layer comprises Hevea latex.

Hevea latexes according to the invention are available from the company SRI Hybrid under the Selatex range, from Getahindus under the Loprotex range, from Vystar Corporation under the Vytex range. Guayule latices according to the invention are available from the company Yulex. Gutta percha latices are available from Rimpex Rubber. Advantageously, the article comprises natural latex in a content ranging from 30% to 100% by weight of natural latex relative to the total weight of the solids content of the polymeric layer, in particular from 50 to 100% by weight. . Preferably, the polymeric layer according to the invention comprises more than 80%, preferably more than 90%, preferably more than 95% by weight of compounds of natural origin relative to the total weight of the polymeric layer, preferably the polymeric layer exclusively comprises compounds of natural origin.

According to one particular embodiment, the flexible article according to the invention comprises an adhesive layer, which comprises elemi gum, caprylic / capric acid triglycerides, ethylguar, and a polymeric layer, which comprises Rubber latex.

Solvent of plant origin The article according to the invention may comprise a solvent medium consisting of one or more solvents of vegetable origin. In other words, according to this embodiment, the composition is then completely free of solvents of non-plant origin. For the purposes of the invention, the term "solvent of vegetable origin" is intended to mean a solvent which is obtained directly from plants and which has not undergone any chemical modification after extraction. The solvents of vegetable origin in accordance with the invention are preferably chosen from alcohols and / or acetates and / or lactates. According to a preferred embodiment, the solvent of vegetable origin is in particular chosen from ethanol and / or ethyl acetate and / or ethyl lactate. Preferably, it will be ethyl acetate. Ethanol exclusively from plant origin is widely available from many suppliers, including from the company TEREOS. Ethyl acetate of plant origin is available from Rhodia. Ethyl lactate is available from the company REACT-NTI under the reference ENVIROSOLVE SILVER. According to one particular embodiment, the flexible article or flexible article in the dry state according to the invention comprises from 1 to 20% of solvent medium by weight, especially from 1 to 10% by weight, in particular from 1 to 5% by weight. % by weight relative to the total weight of the flexible article.

Additional Film-forming Polymer The layer of an article according to the invention may comprise, in addition to the compounds described above, an additional film-forming polymer. For the purpose of the present invention, the term "film-forming polymer" is intended to mean a polymer capable of forming on its own or in the presence of an auxiliary film-forming agent, an isolatable film, in particular a continuous and adherent film, on a support, in particular on the nails. According to the invention, one or more additional film-forming polymers may be used. This additional film-forming polymer may be chosen from the group consisting of synthetic polymers, of radical type or of polycondensate type, polymers of natural origin and their mixtures. The additional film-forming polymer may be chosen in particular from polyurethanes, acrylic polymers, vinyl polymers, polyvinylbutyrals, alkyd resins, ketone / aldehyde resins, resins derived from aldehyde condensation products such as arylsulfonamide resins. formaldehyde such as toluene sulfonamide formaldehyde resin, aryl-sulfonamide epoxy resins or ethyl tosylamide resins. As additional film-forming polymer, the toluene sulfonamide formaldehyde resins Ketjentflex MS80 from AKZO or Santolite MHP, Santolite MS 80 from the company Fontronno or RESIMPOL 80 from PAN AMERICANA can be used in particular, the alkyd resin BECKOSOL ODE 230-70- E of the company DAINIPPON, acrylic resin ACRYLOID B66 from the company ROHM & HAAS 30, the polyurethane resin TRIXENE PR 4127 from BAXENDEN, acetophenone resin / formaldehyde sold under the reference Synthetic Resin SK by Degussa.

The additional film-forming polymer may be present in the composition of the polymeric layer according to the invention in a content ranging from 0.1% to 30% by weight, relative to the total weight of the composition, preferably ranging from 0.5% at 20% by weight, and more preferably from 1% to 10% by weight.

The auxiliary film-forming agent The polymeric layer may furthermore comprise an auxiliary film-forming agent which may be chosen from all the compounds known to those skilled in the art as being capable of fulfilling the desired function, and in particular be chosen from plasticizers. and the coalescing agents of the film-forming polymer. In particular, mention may be made, alone or as a mixture, of the usual plasticizers or coalescing agents, such as: glycols and their derivatives, such as diethylene glycol ethyl ether, diethylene glycol methyl ether, diethylene glycol butyl ether or else diethylene glycol hexyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether, ethylene glycol hexyl ether, glycol esters, propylene glycol derivatives and in particular propylene glycol phenyl ether, propylene glycol diacetate, dipropylene glycol butyl ether, tripropylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol ethyl ether, tripropylene glycol methyl ether and diethylene glycol methyl ether, propylene glycol butyl ether, esters of carboxylic acids, such as citrates, especially triethyl citrate, citrate of tributyl, triethyl acetyl citrate, tributyl acetyl citrate yl, triethyl-2 hexyl acetylcitrate; phthalates, especially diethyl phthalate, dibutyl phthalate, dioctyl phthalate, dipentyl phthalate, dimethoxyethyl phthalate; phosphates, especially tricresyl phosphate, tributyl phosphate, triphenyl phosphate, tributoxyethyl phosphate; tartrates, especially dibutyl tartrate; adipates; carbonates; sebacates; benzyl benzoate, butyl acetylricinoleate, glyceryl acetylricinoleate, butyl glycolate, camphor, glycerol triacetate, N-ethyl-o, p-toluenesulfonamide, oxyethylenated derivatives such as oxyethylenated oils, especially vegetable oils, such as castor oil, silicone oils, hydrocarbon oils such as parleam and polyisobutenes, and mixtures thereof.

The type and amount of plasticizing and / or coalescing agent may be selected by those skilled in the art based on their general knowledge. For example, the content of plasticizer and / or coalescence can range from 0.01% to 20% and in particular from 0.5% to 10% by weight relative to the total weight of the polymeric layer.

Other additives i) Pigments and dyes The adhesive layer and the polymeric layer according to the invention may comprise in particular at least one dyestuff, organic or inorganic, especially of the type of pigments or nacres conventionally used in cosmetic compositions. The term "pigments" is intended to mean white or colored particles, mineral or organic, insoluble in the medium or aqueous, intended to color and / or opacify the resulting film.

The pigments may be present in a proportion of from 0.01 to 20% by weight, in particular from 0.01 to 15% by weight, and in particular from 0.02 to 10% by weight, relative to the total weight of the first composition. and / or organic and / or inorganic film. As inorganic pigments that can be used in the invention, mention may be made of titanium oxide, zirconium oxide or cerium oxide, as well as zinc, iron or chromium oxides, ferric blue, manganese violet, ultramarine blue and the like. chromium hydrate. It may also be a pigment having a structure which may for example be sericite / brown iron oxide / titanium dioxide / silica. Such a pigment is marketed for example under the reference COVERLEAF NS or JS by CHEMICALS AND CATALYSTS and has a contrast ratio of about 30.

The coloring material may also comprise a pigment having a structure which may be, for example, silica microspheres containing iron oxide. An example of a pigment having this structure is that marketed by MIYOSHI under the reference PC BALL PC-LL-100P, this pigment consisting of silica microspheres containing yellow iron oxide.

Among the organic pigments that can be used in the invention, mention may be made of carbon black, D & C type pigments, cochineal carmine, barium, strontium, calcium, aluminum or diketo pyrrolopyrrole (DPP) lacquers. ) described in EP-A-0 542 669, EP-A-0 787 730, EP-A-0 787 731 and WO-A-96/08537.

By nacres, it is necessary to include colored particles of any shape, iridescent or not, notably produced by certain shellfish in their shell or else synthesized and which exhibit a color effect by optical interference. The pearlescent agents may be chosen from pearlescent pigments such as iron oxide coated titanium mica, bismuth oxychloride-coated mica, titanium mica coated with chromium oxide, titanium mica coated with a dye. organic and pearlescent pigments based on bismuth oxychloride. It may also be mica particles on the surface of which are superimposed at least two successive layers of metal oxides and / or organic dyestuffs. Mention may also be made, by way of example of nacres, of natural mica coated with titanium oxide, with iron oxide, with natural pigment or with bismuth oxychloride. Among the nacres available on the market, mention may be made of the TIMICA, FLAMENCO and DUOCHROME pearls (based on mica) marketed by ENGELHARD, the TIMIRON pearls marketed by MERCK, and the nacres based on PRESTIGE mica marketed by the company. company ECKART and nacres based on synthetic mica SUNSHINE marketed by the company SUN CHEMICAL. The nacres may more particularly have a yellow, pink, red, bronze, orange, brown, gold and / or copper color or reflection. As an illustration of the nacres that may be used in the context of the present invention, mention may especially be made of gold-colored pearlescent agents marketed by ENGELHARD under the name Brillant gold 212G (Timica), Gold 222C (Cloisonne) , Sparkle gold (Timica), Gold 4504 (Chromalite) and Monarch gold 233X (Cloisonne); bronze nacres sold especially by the company Merck under the name Bronze Fine (17384) (Colorona) and Bronze (17353) (Colorona) and by Engelhard under the name Super Bronze (Cloisonne); orange nacres sold especially by ENGELHARD under the names 30 Orange 363C (Cloisonne) and Orange MCR 101 (Cosmica) and by MERCK under the name Passion orange (Colorona) and Matte orange (17449) (Microna); brown-colored pearlescent agents marketed by Engelhard under the name Nu-antique copper 340XB (Cloisonne) and Brown CL4509 (Chromalite); nacres with a copper sheen sold especially by Engelhard under the name Copper 340A (Timica); the nacres with a red glint sold especially by MERCK under the name Sienna fine (17386) (Colorona); yellow-colored pearlescent agents marketed by ENGELHARD under the name Yellow (4502) (Chromalite); the red-colored pearlescent agents with a gold glint sold especially by ENGELHARD under the name Sunstone G012 (Gemtone); pink nacres sold especially by Engelhard under the name Tan opal G005 (Gemtone); the black nacres with gold reflection sold by the company Engelhard under the name Nu antique bronze 240 AB (Timica), the blue nacres sold especially by the company Merck under the name Matte Blue (17433) (Microna), the white nacres with reflection silver sold in particular by the company Merck under the name Xirona Silver and the golden-green orange-colored mother-of-pearl marketed by Merck under the name Indian summer (Xirona) and their mixtures.

The first composition and / or the organic and / or inorganic film according to the invention may also comprise water-soluble or fat-soluble dyes in a content ranging from 0.01 to 10% by weight, in particular ranging from 0.01 to 5% by weight. relative to the total weight of the first composition or the organic and / or inorganic film. Fat-soluble dyes are, for example, Sudan red, DC Red 17, DC Green 6,--carotene, soya bean oil, Sudan brown, DC Yellow 11, DC Violet 2, orange DC 5, yellow quinoline. The water-soluble dyes are, for example, beet juice, methylene blue.

ii) Effect material The adhesive layer and the polymeric layer according to the invention may contain at least one material with a specific optical effect. This effect is different from a simple conventional hue effect, that is to say unified and stabilized as produced by conventional dyestuffs described above such as monochromatic pigments. In the sense of the invention, stabilized means devoid of color variability effect with the angle of observation or in response to a change in temperature. This material is present in sufficient quantity to produce an optical effect perceptible to the naked eye. Advantageously, it is an effect selected from the goniochromatic, metallic and in particular mirror, soft-focus, rainbow and / or thermochromic and / or photochromic effects. For example, this material may be chosen from metal-reflecting particles, goniochromatic coloring agents, diffractive pigments, thermochromic, photochromic agents and optical brighteners, as well as fibers, in particular interferential fibers. Of course, these different materials can be combined to provide the simultaneous manifestation of two effects, or even a new effect according to the invention.

Particles with metallic reflection Particles with metallic reflection are particles whose nature, size, structure and surface state allow them to reflect incident light, particularly in a non-iridescent manner. The particles having a substantially flat outer surface are also suitable because they can more easily give birth, if their size, structure and surface condition allow, to an intense specular reflection that can be called a mirror effect. The particles with a metallic sheen that can be used in the invention can, for example, reflect light in all the visible components without significantly absorbing one or more wavelengths. The spectral reflectance of these particles may for example be greater than 70% in the range 400-700 nm, and more preferably at least 80%, even 90% or 95%. These particles generally have a thickness less than or equal to 1 m, in particular less than or equal to 0.7 m, in particular less than or equal to 0.5 m. The total proportion of particles with a metallic sheen is in particular less than or equal to 20% by weight and in particular less than or equal to 10% by weight relative to the total weight of the first composition or of the organic and / or inorganic film.

The particles with a metallic sheen that can be used in the invention are in particular chosen from: particles of at least one metal and / or at least one metal derivative; particles comprising a substrate, organic or inorganic, monomatiere or multimaterial at least partially covered by at least one metal-reflecting layer comprising at least one metal and / or at least one metal derivative, and the mixtures of said particles. Among the metals that may be present in said particles, mention may be made, for example, of Ag, Au, Cu, Al, Ni, Sn, Mg, Cr, Mo, Ti, Zr, Pt, Va, Rb, W, Zn, Ge, Te. Se and their mixtures or alloys. Ag, Au, Cu, Al, Zn, Ni, Mo, Cr, and mixtures or alloys thereof (eg, bronzes and brasses) are preferred metals. The term "metal derivatives" denotes compounds derived from metals, in particular oxides, fluorides, chlorides and sulphides. Among the metal derivatives that may be present in said particles, mention may in particular be made of metal oxides such as, for example, titanium oxides, in particular TiO 2, iron in particular Fe 2 O 3, tin, chromium, barium sulfate and the following compounds : MgF 2, CrF 3, ZnS, ZnSe, SiO 2, Al 2 O 3, MgO, Y 2 O 3, SeO 3, SiO, HfO 2, ZrO 2, CeO 2, Nb 2 O 5, Ta 2 O 5, MoS 2 and mixtures or alloys thereof.

According to a first variant, the particles with a metallic sheen may be composed of at least one metal as defined above, at least one metal derivative as defined above or else one of their mixtures. These particles may be at least partially covered by a layer of another material, for example an transparent material such as in particular rosin, silica, stearates, polysiloxanes, polyester resins, epoxy resins, polyurethane resins and acrylic resins. As an illustration of these particles, mention may be made of aluminum particles, such as those sold under the names STARBRITE 1200 EAC by the company SIBERLINE and METALURE by the company ECKART.

Mention may also be made of copper metal powders or alloy blends such as the references 2844 sold by the company Radium Bronze, metallic pigments such as aluminum or bronze, such as those sold under the names ROTOSAFE 700 from the company ECKART the silica-coated aluminum particles marketed under the name VISIONAIRE BRIGHT SILVER by ECKART and the metal alloy particles such as bronze powders (copper and zinc alloy) coated with silica marketed under the name of Visionaire Bright Natural Gold from Eckart.

According to a second variant, these particles may be particles comprising a substrate and which therefore have a multilayer structure, for example a bilayer structure. This substrate may be organic or inorganic, natural or synthetic, monomaterial or multimaterial, solid or hollow. When the substrate is synthetic, it may be made with a shape that promotes the formation of a reflective surface after coating, in particular after the deposition of a layer of metal-reflecting materials. The substrate may, for example, have a planar surface and the metal-reflective material layer a substantially uniform thickness.

The substrate may in particular be chosen from metals and metal derivatives as mentioned above, and also from glasses, ceramics, aluminas, silicas, silicates, and especially aluminosilicates and borosilicates, synthetic mica such as fluorophlogopite , and their mixtures, this list not being limiting. The metal-reflecting layer may coat all or part of the substrate and this layer may be at least partially covered by a layer of another material, for example a transparent material such as mentioned above. According to a particular embodiment, this metal-reflecting layer completely, directly or indirectly, that is to say with the interposition of at least one metal intermediate layer or not, the substrate.

The metals or metal derivatives that can be used in the reflective layer are as defined above. For example, it may be formed of at least one metal chosen from silver, aluminum, chromium, nickel, molybdenum, gold, copper, tin, magnesium and their mixtures (alloys ). More particularly, silver, chromium, nickel, molybdenum and mixtures thereof are used.

As an illustration of this second type of particles, mention may be made more particularly of: glass particles coated with a metal layer, in particular those described in documents JP-A-09188830, JP-A-10158450, JP-A-10158541, JP -A-07258460 and JP-A-05017710. As an illustration of these particles comprising a glass substrate, mention may be made of those coated respectively with silver, gold or titanium, in the form of platelets, sold by the company NIPPON SHEET GLASS under the names MICROGLASS METASHINE. Particles with a silver-coated glass substrate, in the form of platelets, are sold under the name MICROGLASS METASHINE REFSX 2025 PS by the company TOYAL. Particles with a glass substrate coated with a nickel / chromium / molybdenum alloy are sold under the name CRYSTAL STAR GF 550, GF 2525 by the same company. Those coated either with brown iron oxide or with titanium oxide, with tin oxide or with a mixture thereof, such as those sold under the name REFLECKS by Engelhard or those sold under the reference METASHINE ™ 2080GP by the company NIPPON SHEET GLASS.

These metal-coated glass particles may be coated with silica, such as those sold under the name METASHINE series PSS1 or GPS1 by the company Nippon SHEET GLASS. Particles with spherical glass substrate coated or not with a metal, in particular those sold under the name PRIZMALITE MICROSPHERE by the company PRIZMALITE INDUSTRIES. Also suitable for the invention are the pigments of the METASHINE 1080R range marketed by NIPPON SHEET GLASS CO. LTD. These pigments, more particularly described in patent application JP 2001-11340, are C-GLASS glass flakes comprising 65 to 72% SiO 2, coated with a rutile titanium oxide layer (TiO 2). These glass flakes have an average thickness of 1 micron and an average size of 80 microns is a ratio average size / average thickness of 80. They have blue, green, yellow or silver-tone reflections depending on the thickness of the layer of TiO2. Particles comprising a silver coated borosilicate substrate, also called white nacres.

Particles with a metal substrate such as aluminum, copper and bronze, in the form of platelets, are sold under the trade name STARBRITE by the company SILBERLINE and under the name VISIONAIRE by the company ECKART. Particles comprising a synthetic mica substrate coated with titanium dioxide, and for example particles having a size of between 80 and 100 m, comprising a synthetic mica substrate (fluorophlogopite) coated with titanium dioxide, representing 12% of the total weight of the particle, sold under the name PROMINENCE by the company NIHON KOKEN. The particles with a metallic sheen may also be chosen from particles formed from a stack of at least two layers with different refractive indices. These layers may be polymeric or metallic in nature and in particular include at least one polymeric layer. Thus, the metal effect particles may be particles derived from a multilayer polymeric film.

The choice of materials for constituting the different layers of the multilayer structure is of course carried out so as to impart the desired metallic effect to the particles thus formed. Such particles are in particular described in WO 99/36477, US Pat. No. 6,299,979 and US Pat. No. 6,387,498 and more particularly identified hereinafter in the goniochromatic chapter.

Diffractive Pigments For the purposes of the present invention, the term "diffractive pigment" denotes a pigment capable of producing a color variation according to the angle of observation when illuminated by white light, because of the presence of a structure which diffracts the light. A diffractive pigment may comprise a diffraction grating, capable for example of diffracting in defined directions an incident monochromatic light ray. The diffraction grating may comprise a periodic pattern, in particular a line, the distance between two adjacent patterns being of the same order of magnitude as the wavelength of the incident light.

When the incident light is polychromatic, the diffraction grating will separate the different spectral components of the light and produce a rainbow effect. We can usefully refer to the structure of diffracting pigments in the article Pigments Exhibiting Diffractive Effects by Alberto Argoitia and Matt Witzman, 2002, Society of Vacuum Coaters, 45th Annual Technical Conference Proceedings 2002. The diffractive pigment can be made with patterns having different profiles, in particular triangular, symmetrical or not, in crenellations, of constant width or not, sinusoidal.

The spatial frequency of the network and the depth of the patterns will be chosen according to the degree of separation of the different orders desired. The frequency can vary for example between 500 and 3000 lines per mm. Preferably, the particles of the diffractive pigment each have a flattened shape, and in particular are platelet-shaped.

The same pigment particle may comprise two crossed diffraction gratings, perpendicular or otherwise. A possible structure for the diffractive pigment may comprise a layer of reflective material, covered at least on one side with a layer of a dielectric material. The latter can impart better rigidity and durability to the diffractive pigment. The dielectric material may then be chosen for example from the following materials: MgF 2, SiO 2, Al 2 O 3, AlF 3, CeF 3, LaF 3, NdF 3, SmF 2, BaF 2, CaF 2, LiF and their combinations. The reflective material may be chosen for example from metals and their alloys and also from non-metallic reflective materials. Among the metals that may be used, mention may be made of Al, Ag, Cu, Au, Pt, Sn, Ti, Pd, Ni, Co, Rd, Nb, Cr and their compounds, combinations or alloys. Such a reflective material may alone constitute the diffractive pigment which will then be monolayer. Alternatively, the diffractive pigment may comprise a multilayer structure comprising a core of a dielectric material covered with a reflective layer at least on one side, or even completely encapsulating the core. A layer of a dielectric material may also cover the reflective layer (s). The dielectric material used is then preferably inorganic, and may be chosen for example from metal fluorides, metal oxides, metal sulfides, metal nitrides, metal carbides and their combinations. The dielectric material may be in the crystalline, semicrystalline or amorphous state. The dielectric material, in this configuration, may for example be selected from the following materials: MgF 2, SiO 2, SiO 2, Al 2 O 3, TiO 2, WO, AlN, BN, B 4 C, WC, TiC, TiN, N 4 Si 3, ZnS, glass particles , diamond-like carbons and their combinations. The diffractive pigment used may in particular be chosen from those described in US patent application US 2003/0031870 published on February 13, 2003. A diffractive pigment may comprise, for example, the following structure: MgF 2 / Al / MgF 2, a diffractive pigment having this structure being marketed under the name SPECTRAFLAIR 1400 Pigment Silver by the company FLEX PRODUCTS, or SPECTRAFLAIR 1400 Pigment Silver FG. The proportion by weight of the MgF 2 can be between 80 and 95% of the total weight of the pigment.

Goniochromatic coloring agents For the purposes of the invention, a goniochromatic coloring agent makes it possible to observe a color change, also called color flop, as a function of the angle of observation, greater than that which can be encountered with nacres. One or more goniochromatic coloring agents may be used simultaneously. The goniochromatic coloring agent may be selected to have a relatively large color change with the viewing angle. The goniochromatic coloring agent can thus be chosen so that it is possible to observe, for a variation of the angle of observation of between 0 ° and 80 ° under a lighting at 45 °, a color variation AE of the cosmetic composition, measured in the CIE 1976 color space, of at least 2.

The goniochromatic coloring agent may also be chosen so that a 45 ° illumination and a variation of the observation angle of between 0 ° and 80 ° can be observed for a variation Dh of angle of tint of the cosmetic composition, in the plan CIE 1976, at least 30 ° or even at least 40 ° or at least 60 °, or even at least 100 °.

The goniochromatic coloring agent may be chosen, for example, from interferential multilayer structures and liquid crystal coloring agents.

In the case of a multilayer structure, this may comprise for example at least two layers, each layer, independently or not of the other layer (s) being made for example from at least one material selected from the group consisting of the following materials: MgF 2, CeF 3, ZnS, ZnSe, Si, SiO 2, Ge, Te, Fe 2 O 3, Pt, Va, Al 2 O 3, MgO, Y 2 O 3, 5203, SiO, HfO 2, ZrO 2, CeO 2, Nb 2 O 5, Ta 2 O 5, TiO 2, Ag, Al, Au, Cu, Rb, Ti, Ta, W, Zn, MoS 2, cryolite, alloys, polymers and their combinations. The multilayer structure may or may not have, with respect to a central layer, a symmetry at the chemical nature of the stacked layers. Examples of symmetrical interferential multilayer structures that can be used in compositions produced in accordance with the invention are, for example, the following structures: Al / SiO 2 / Al / SiO 2 / Al, pigments having this structure being marketed by the company DUPONT DE NEMOURS; Cr / MgF 2 / Al / MgF 2 / Cr, pigments having this structure being marketed under the name CHROMAFLAIR by the company FLEX; MoS2 / SiO2 / Al / SiO2 / MoS2 Fe2O3 / SiO2 / Al / SiO2 / Fe2O3, and Fe2O3 / SiO2 / Fe2O3 / SiO2 / Fe2O3 / Fe2O3, pigments having these structures being marketed under the name SICOPEARL by BASF MoS2 / SiO2 / mica-oxide / SiO 2 / MoS 2; Fe2O3 / SiO2 / mica-oxide / SiO2 / Fe2O3; TiO2 / SiO2 / TiO2 and TiO2 / Al2O3 / TiO2; SnO / TiO2 / SiO2 / TiO2 / SnO; Fe 2 O 3 / SiO 2 / Fe 2 O 3 SnO / mica / TiO 2 / SiO 2 / TiO 2 / mica / SnO, pigments having these structures being sold under the name XIRONA by the company Merck (Darmstadt). By way of example, these pigments may be the pigments of silica / titania / tin oxide structure sold under the name Xirona Magic by the company Merck, the silica / brown iron oxide structural pigments marketed under the name XIRONA. INDIAN SUMMER by the company MERCK and the silica / titanium oxide / mica / tin oxide structural pigments marketed under the name XIRONA CARRIBEAN BLUE by the company MERCK. Mention may also be made of the INFINITE COLORS pigments from SHISEIDO. Depending on the thickness and nature of the different layers, different effects are obtained. Thus, with the Fe 2 O 3 / SiO 2 / Al / SiO 2 / Fe 2 O 3 structure, grey-green to gray-red is passed for SiO 2 layers of 320 to 350 nm; from red to golden for layers of SiO2 from 380 to 400 nm; from violet to green for SiO2 layers from 410 to 420 nm; from copper to red for SiO2 layers from 430 to 440 nm.

It is also possible to use goniochromatic coloring agents with a multilayer structure comprising an alternation of polymeric layers. As an illustration of the materials that may constitute the different layers of the multilayer structure, mention may be made of this list not being limiting: polyethylene naphthalate (PEN) and its isomers, for example 2,6-, 1,4-, 1 , 5-, 2,7- and 2,3-PEN, polyalkylene terephthalates, polyimides, polyetherimides, atactic polystyrenes, polycarbonates, polymethacrylates and alkyl polyacrylates, syndiotactic polystyrene (sPS), syndiotactic poly-alpha-methylstyrene, syndiotactic polydichlorostyrene, copolymers and mixtures of polystyrenes, cellulose derivatives, polyalkylene polymers, fluorinated polymers, chlorinated polymers, polysulfones, polyethersulfones, polyacrylonitriles, polyamides, silicone resins epoxy resins, polyvinyl acetate, polyether amides, ionomeric resins, elastomers and polyurethanes. Also suitable are copolymers, for example copolymers of PEN (for example, 2,6-, 1,4-, 1,5-, 2,7-, and / or 2,3-naphthalene dicarboxylic acid copolymers or its esters with (a) terephthalic acid or its esters, (b) isophthalic acid or its esters, (c) phthalic acid or its esters, (d) alkane glycols, (e) cycloalkane glycols (eg cyclohexane dimethanol diol) (f) alkane dicarboxylic acids, and / or (g) cycloalkane dicarboxylic acids, polyalkylene terephthalate copolymers and styrene copolymers In addition, each individual layer may include mixtures of two or more previous polymers or copolymers The choice of the materials intended to constitute the different layers of the multilayer structure is of course carried out in such a way as to confer the desired optical effect on the particles thus formed: by way of example, pigments with a 25 "multilayer structure may be mentioned. lymeric, those marketed by 3M under the name COLOR GLITTER. The liquid crystal coloring agents comprise, for example, silicones or cellulose ethers onto which mesomorphic groups are grafted. As liquid crystal goniochromatic particles, it is possible, for example, to use those sold by CHENIX as well as those marketed under the name HELICONE HC by WACKER.

These agents may also be in the form of dispersed goniochromatic fibers. Such fibers may for example have a size of between 50 m and 700 m, for example about 300 m. In particular, interferential fibers with a multilayer structure can be used. Fibers with a multilayer structure of polymers are described in particular in EP-A-0 921 217, EP-A-0 686 858 and US-A-5,472,798. The multilayer structure may comprise at least two layers, each layer, independently or not of the other layer (s), being made of at least one synthetic polymer. The polymers present in the fibers may have a refractive index ranging from 1.30 to 1.82 and more preferably from 1.35 to 1.75. Preferred polymers for forming the fibers are polyesters such as polyethylene terephthalate, polyethylene naphthalate, polycarbonate; acrylic polymers such as polymethylmethacrylate; polyamides. Goniochromatic fibers with a polyethylene terephthalate / nylon-6 bilayer structure are marketed by TEIJIN under the name MORPHOTEX. In a variant, this goniochromatic coloring agent may be associated with at least one diffractive pigment. The combination of these two materials results in a composition or film that exhibits increased color variability, which is likely to allow an observer to perceive a color change, or even a color movement, under many conditions. observation and illumination. The weight ratio of the diffractive pigment to the goniochromatic coloring agent is preferably between 85/15 and 15/85, more preferably between 80/20 and 20/80, more preferably 60/40 and 40/60, for example of the order of 50/50. Such a ratio is favorable to obtaining a sustained rainbow effect and goniochromatic effect.

Optical brighteners Optical brighteners are compounds well known to those skilled in the art. Such compounds are especially described in Fluorescent Whitening Agent, Encyclopedia of Chemical Technology, Kirk-Othmer, Vol 11, p. 227-241, 4th edition, 1994, Wiley. They can more particularly be defined as compounds which absorb essentially in the UVA between 300 and 390 nm and re-emit essentially between 400 and 525 nm. Among the optical brighteners, mention may be made more particularly of stilbene derivatives, in particular polystyrylstilbenes and triazinstilbenes, coumarin derivatives, in particular hydroxycoumarines and aminocoumarines, oxazole, benzoxazole, imidazole, triazole and pyrazoline derivatives, and derivatives thereof. pyrene and porphyrin derivatives and mixtures thereof. Such compounds are readily available commercially. There may be mentioned for example: the stilbene derivative of naphtho-triazole sold under the trade name Tinopal GS, di-styryl-4,4 'biphenyl di-sodium sulfonate (CTFA name: disodium distyrylbiphenyl disulfonate) sold under the trade name Tinopal CBS -X, the cationic derivative of aminocoumarin sold under the trade name Tinopal SWN CONC. sodium 4,4'-bis [(4,6-dianilino-1,3,5-triazin-2-yl) amino] stilbene-2,2'-disulfonate sold under the trade name Tinopal SOP, 4 4'-bis [(4-anilino-6-bis (2-hydroxyethyl) amino-1,3,5-triazin-2-yl) amino] stilbene-2,2'-disulfonic acid sold under the trade name Tinopal UNPA-GX, 4,4'-bis [anilino-6-morpholine-1,3,5-triazin-2-yl) amino] stilbene sold under the trade name Tinopal AMS-GX, 4,4 ' Bis - [(4-anilino-6- (2-hydroxyethyl) methylamino-1,3,5-triazin-2-yl) amino] stilbene-2,2'-disodium sulphonate sold under the trade name Tinopal 5BM-GX , all by the company CIBA Specialty Chemicals, 2,5-thiophene di-yl bis (5-tert-butyl-1,3-benzoxazole) sold under the trade name Uvitex OB by the company CIBA, the anionic derivative of di-aminostilbene in dispersion in water sold under the trade name Leucophor BSB liquid by Clariant, brighteners of optical brightener sold under the trade name COVAZUR by the company WACKHERR.

Optical brighteners that may be used in the present invention may also be in the form of copolymers, for example acrylates and / or methacrylates, grafted with optical brightening groups as described in application FR 99 10942. They may be used as they are or introduced into the film in the form of particles and / or fibers covered with said brightener, such as those described below.

In particular, it is possible to use the fibers coated with optical brighteners as marketed by LCW under the trade reference Fiberlon 54 ZO3, having a length of approximately 0.4 mm and a titer of 0.5 denier. - Material with relief effect The relief effect may or may not be associated with an optical effect. A material of this type is generally present in an amount sufficient to confer a perceptible relief effect to the touch or to the naked eye. It can in particular be a rough effect and / or hammered. - Material conferring a rough appearance The particles of substantially spherical or ovoid shape can give a soft touch to the makeup. Advantageously, the solid particles have a substantially spherical shape, to allow their good distribution during their application.

The solid particles used according to the invention may have an average size ranging from 2.5 m to 5 mm, and better still from 50 m to 2 mm. The smaller the particles, the better the resistance of the particles. The use of particles is also compatible with pattern making. The solid particles may be of any material satisfying the properties of densities defined above. For example, the solid particles may be made of a material chosen from glass, zirconium oxide, tungsten carbide, plastics such as polyurethanes, polyamides, polytetrafluoroethylene, polypropylene, metals such as steel, copper, brass, chrome, marble, onyx, jade, natural mother-of-pearl, precious stones (diamond, emerald, ruby, sapphire), amethyst, aquamarine. Glass beads such as those sold under the name SILIBEADS by the company SIGMUND LINDNER are preferably used; these beads also have the advantage of also giving a shiny effect and flicker to the makeup. The solid particles, deformable or not, may be solid or hollow, colorless or colored, coated or not. As regards the fibers that may be used according to the invention, they may be fibers of synthetic or natural, mineral or organic origin.

By fiber, it is necessary to understand an object of length L and of diameter D such that L is much greater than D, D being the diameter of the circle in which the section of the fiber is inscribed. In particular, the L / D ratio (or form factor) is chosen in the range from 3.5 to 2500, preferably from 5 to 500, and more preferably from 5 to 150.

It may in particular be fibers used in the manufacture of textiles and in particular silk fibers, cotton, wool, flax, cellulose fibers, especially extracted from wood, vegetables or seaweed, rayon, polyamide (nylon), viscose, acetate especially rayon acetate, poly- (p-phenylene terephthalamide) (or aramid) including Kevlar, acrylic polymer including polymethyl methacrylate or poly 2 hydroxyethyl methacrylate, polyolefin and in particular polyethylene or polypropylene, glass, silica, carbon in particular in graphite form, polytetrafluoroethylene (such as Teflon), insoluble collagen, polyesters, polyvinyl chloride or vinylidene , polyvinyl alcohol, polyacrylonitrile, chitosan, polyurethane, polyethylene phthalate, fibers formed from a mixture of polymers such as those mentioned above, such as polyamide / polyester fibers.

Material conferring a hammered appearance The inventors have also found that it is possible to condition in the invention a material comprising a fumed silica, metal pigment and organopolysiloxane compound to give it a hammered appearance. Such a mixture is described in particular in patent application EP 1 040 813.

iii) Material with an olfactory effect Advantageously, the article according to the invention may also be provided with olfactory properties by incorporation in particular into at least one of the layers of at least one odorous material or perfume substance. The fragrancing substance may be chosen from any odoriferous substance well known to those skilled in the art, and in particular from essential oils and / or essences. This olfactory material can, if necessary, be introduced via a solvent-plasticizer.

By solvent-plasticizer is meant a compound which at least partially solubilizes the olfactory material and is capable of slowly evaporating. The solvent-plasticizer may be chosen from glycols such as dipropylene glycol, ethyldiglycol, n-propylglycol, n-butylglycol, methyldiglycol, n-butyldiglycol, alcohols such as cyclohexanol, ethyl-2 butanol, 3-methoxybutanol, 2-ethylhexanol, phenoxyethanol, esters, such as glycol monoacetate, ethylglycol acetate, n-butylglycol acetate, ethyldiglycol acetate, n-butyldiglycol acetate, methyl abietate, isopropyl myristate, propylene glycol diacetate, propylene glycol methyl ether acetate, glycol ethers such as dipropylene glycol methyl ether butyl ether of dipropylene glycol, alone or as a mixture.

Any of the layers of the article according to the invention may also contain one or more formulation additives commonly used in cosmetics and more particularly in the cosmetics and / or nail care sector. They may especially be chosen from vitamins, trace elements, softeners, sequestering agents, basifying or acidifying agents, wetting agents, thickening agents, dispersing agents, defoamers, leveling agents, co-resins, preservatives, UV filters, actives, moisturizers, neutralizers, stabilizers, antioxidants and mixtures thereof. Thus, they may in particular incorporate, as active agents, curing agents or hardeners for keratin materials, active agents promoting the growth of the nail, such as methylsulfonylmethane and / or active agents for treating various conditions localized at the level of the skin. nail, such as antimycotic or antimicrobial active agents.

The amounts of these various ingredients are those conventionally used in this field and, for example, from 0.01 to 20% by weight, and especially from 0.01 to 10% by weight relative to the total weight of the flexible sheet and / or adhesive material.

The invention is illustrated in detail in the following example which is presented for illustrative and not limiting of the invention.

Unless otherwise indicated, the amounts are given as a percentage by weight of raw material relative to the total weight of the composition.

EXAMPLE In this example, a first polymeric film is made from a deproteinized Hevea latex (1) of solids content of about 60%. The Hevea latex coating is carried out at 150 m wet on a contrast card, marketed by BYK Gardner under the product name Prüfkarte 2853. A second composition, useful for the formation of the adhesive layer, 10 (see table next) is coated at 300 m wet on a backing tape (Scotchpak 1022 Release liner 3.0 mil available from 3M). Ethylguar (2) 5% Elemi gum (3) 15% Triglycerides of capric / capric acids (4) 10% Ethyl acetate (5) 70% marketed by SRI Hybrid marketed by Hercules marketed by Emiga marketed by the company Cognis marketed by the company Rhodia After drying of the two films, the latex film is put in contact with the film 20 of the composition of the table. Pressure is exerted to adhere the films together. Then, carefully remove the contrast card and then the adhesive tape. An adhesive laminate is obtained which makes it possible to obtain good adhesion on the nails. (1) (2) (3) 15 (4) (5)

Claims (18)

REVENDICATIONS1. A flexible article intended to be applied to the nails and / or false nails for their makeup and / or care including at least one adhesive layer, characterized in that said adhesive layer comprises at least one natural resin or gum, at least one plasticizer, and at least one polysaccharide or polysaccharide derivative. 2. Article according to claim 1, characterized in that the resin or natural gum is chosen from optionally modified compounds of natural origin, such as rosin or its derivatives, terpene resins, shellac, sandaraque gum, dammars, elemi, copals, benzoin, gum putty and mixtures thereof, in particular sardarac gum, benzoin or elemi. 3. Article according to any one of the preceding claims, characterized in that the adhesive layer comprises from 0.1 to 90% by weight of resin or gum relative to the total weight of the solids content of the adhesive layer, in particular from 30 to 80% by weight, and still more particularly from 40 to 70% by weight. 4. Article according to any one of the preceding claims, characterized in that the plasticizer is selected from optionally modified compounds of natural origin such as oils comprising at least one fatty acid selected from caprylic acid, capric acid , lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, rinoleic acid, linoleic acid, linolenic acid, arachidic acid, gadoleic acid , behenic acid, erucic acid, brassidic acid, cetoleic acid, lignoceric acid, nervonic acid and a mixture thereof, and in particular oils comprising a caprylic acid mixture and capric, or alternatively caprylic and / or capric acid esters or caprylic and / or capric alcohol esters. 5. Article according to the preceding claim, characterized in that the oils are chosen from triglycerides consisting of esters of fatty acids and glycerol whose fatty acids have chain lengths of C4 to C24, the latter may be linear or branched, saturated or unsaturated. 6. Article according to the preceding claim, characterized in that the oils are selected from heptanoic or octanoic triglycerides, peanut, babassu, coconut, grape seed, cotton, corn, corn sprouts, mustard seed, palm kernel, rapeseed, sesame seed, soya bean, sunflower seed, wheat germ, canola seed, apricot kernel, mango seed, castor kernel, shea kernel, avocado kernel, olive, sweet almond, peach almond, walnut, hazelnut, macadamia, jojoba, alfalfa, poppy, pumpkin, squash, blackcurrant, evening primrose, millet, barley , quinoa, rye, safflower, bancoulier, passionflower, rose hip, shea butter or the triglycerides of caprylic / capric acids, and mixtures thereof, and in particular caprylic / capric acid triglycerides. 7. Article according to any one of the preceding claims, characterized in that the adhesive layer comprises from 0.1 to 70% by weight of plasticizer relative to the total weight of the dry extract of the adhesive layer, in particular 5 60% by weight, and more particularly 10 to 50% by weight. 8. Article according to any one of the preceding claims, characterized in that it further comprises at least one polysaccharide or polysaccharide derivative, in particular chosen from alkyl ethers and cellulose or guar esters, in particular chosen from ethylguars, ethylcelluloses, acetopropionates or cellulose acetobutyrates. 9. Article according to the preceding claim, characterized in that the adhesive layer comprises from 5 to 60% by weight of polysaccharide or polysaccharide derivative relative to the total weight of the solids of the adhesive layer, in particular from 10 to 30 % by weight, and more particularly from 10 to 20% by weight. 10. Article according to any one of the preceding claims, characterized in that said article further comprises at least one polymeric layer. 11. Article according to the preceding claim, characterized in that the polymeric layer comprises either: - either at least one polysaccharide or polysaccharide derivative, such as an ester or alkyl ether of cellulose, preferably a cellulose acetate butyrate, a cellulose acetopropionate ethylcellulose or ethyguar; or at least one latex of natural origin, optionally deproteinized, preferably the natural latex of polyisoprene, in particular chosen from the latexes of rubber, Parthernium Argentatum, solidago virgaurea minuta, Taraxacum koksaghyz, Gutta percha, Gutta balata, sapodilla, and their mixture. 12. Article according to any one of the preceding claims, characterized in that said article comprises more than 80% by weight of compounds of natural origin, in particular more than 90% by weight, preferably more than 95% by weight by weight. relative to the total weight of said article, or even consists exclusively of compounds of natural origin. 13. Article according to any one of the preceding claims, characterized in that the adhesive layer of said article has a thickness of 5 to 100 m, preferably 10 to 80 m, preferably 15 to 50 m and preferably 20 to 100 m. at 30 m. 14. Article according to any one of the preceding claims, characterized in that said article has a thickness ranging from 6 m to 1 mm, in particular from 10 m to 500 m, and even more particularly from 50 m to 200 m. 15. Article according to any one of the preceding claims, characterized in that said article is capable of being cleansed using a solvent selected from acetone, alkyl acetates such as acetate of ethyl, and mixtures thereof. 16. Article according to any one of the preceding claims, characterized in that the weight of the dry extract of said article is greater than or equal to 95% by weight relative to the total weight of the article. 17. Makeup and / or care product for the nails and / or false nails comprising in a substantially airtight packaging, at least one article according to any one of claims 1 to 15, the packaging being such that the article is kept in a partially dry form. 18. A method of makeup and / or care of nails and / or false nails comprising at least one step of applying to a natural nail and / or false nail, a dry article as defined in claims 1 to 16, or an article in partially dry form as included in the product according to claim 17.