WO2002036364A1

WO2002036364A1 - System for transferring a coloured pattern on the skin and uses thereof

Info

Publication number: WO2002036364A1
Application number: PCT/FR2001/003292
Authority: WO
Inventors: Nathalie Jager-Lezer
Original assignee: L"Oreal
Priority date: 2000-11-02
Filing date: 2001-10-23
Publication date: 2002-05-10
Also published as: FR2815906A1

Abstract

The invention concerns a system for transferring a coloured pattern on the skin comprising: i) a base layer; ii) an adhesive matrix (2) including a skin colouring agent, the base layer (1) being impermeable to the skin colouring agent. The invention also concerns a method for semi-permanent colouring of the skin using said system. The inventive system and method enable to create decorative patterns on the skin securely, simply, comfortably and inexpensively.

Description

SYSTEM FOR TRANSFERRING A COLORED PATTERN ON THE SKIN AND

USES

The present invention relates to a color pattern transfer system for creating semi-permanent decorative patterns on the skin. It also relates to its uses in the cosmetic field, in particular make-up and in particular make-up of the body.

One of the best known methods of creating decorative patterns on the skin is permanent tattooing. However, this process has many drawbacks: it involves a needle which not only must be handled by a specialist but which can also be a source of infections. In addition, this process is painful and expensive. Finally, its permanent nature can also have a drawback: the tattoo cannot be used as an accessory or as a temporary makeup which can be changed frequently and quickly. Nowadays, we want to decorate our body temporarily and to be able to change the decoration easily and at will.

There are many methods for creating non-permanent or semi-permanent decorative patterns on the skin. By non-permanent or semi-permanent is meant a coloration which remains on the skin for a period ranging from a few hours to several weeks.

There are thus tattoos which one qualifies as “solar” which use the principle of the stencil. The method consists in fixing adhesive images in the form of a stencil on an area of skin and then subjecting said area to UV radiation. The pattern is formed by the difference in pigmentation by the sun between tanned and non-tanned skin. However, it is known that UV-A radiation which causes browning of the skin is capable of inducing an alteration of the latter, in particular in the case of sensitive skin or of skin continuously exposed to solar radiation. Otherwise, obtaining and keeping such tattoos is random (depending on the intensity of the sunshine) and / or restrictive (use of UV lamps). In addition, the tattoo obtained lasts the time of the tan, time that we cannot always control.

Another common process for creating decorative patterns on the skin is through decals which transfer a printed image to the skin after moistening. However, the images thus obtained are not always very clear, the ink may smear. In addition, these images often disappear very quickly with water or rubbing.

To obtain a more durable coloring, many processes involve henna which tints the stratum corneum of the skin and which can thus remain on its surface for 1 to 4 weeks. However, the classic application of henna on the skin requires a certain mastery of drawing techniques and should preferably be performed by an artist. Indeed, henna is generally applied in the form of a paste or a cream that stains the skin. Thus, this paste can drool or be inadvertently applied to a place on the body not provided for by unskilled hands. Furthermore, once applied to the body, this paste can also stain clothing.

Document US Pat. No. 5,836,998 proposes an adhesive stencil on which a henna-based preparation is deposited to make temporary drawings and to facilitate the decoration on the skin. This preparation is applied for 3 to 4 hours. If this method makes it possible to avoid the unsightly effects due to the inexperience of the user, it obliges the latter to take precautions, throughout the time of the application (several hours) so that the preparation based on henna n '' does not come into contact with, and thus does not stain, supports such as clothing or other parts of the body. This method is therefore very restrictive.

There therefore remains the need for a system making it possible to decorate the skin in a semi-permanent manner which does not have the drawbacks of the prior art. On the other hand, French patent application FR-A-2,792,192 describes a device of the adhesive patch type for makeup intended to be applied to the. skin, then to be removed when makeup is no longer desired. Such a device comprises a detachable protective sheet or film, a reversible pressure-sensitive adhesive layer, which can contain a make-up material, at least one layer chosen from a layer linked to the adhesive layer and which can contain a make-up material, and an outer protective layer. It is therefore the makeup device which is the vehicle for the decorative pattern (colored or not), said pattern being visible in relief, and more or less blurred depending on the location, the nature and the thickness of the layer in which it is inserted make-up material. However, the decoration thus obtained is not intended to last semi-permanently, the device wearing out during the day and cannot be reasonably worn for more than a day. In addition, the wearing of such a device can be essential for some people by the unpleasant feeling which can result therefrom, and the images are dependent on the support on which they are fixed, giving an artificial character to the makeup. Finally, this device does not lead to a color transfer on the skin; it is therefore not a device for coloring the skin.

Similarly, it is known from document US 5, 120, 325 to color, in particular a shade close to the natural color of the skin, sterile bandages intended for wounds, with the aim of making them more discreet. But it is quite clear that no color transfer is carried out on the skin.

It has now been discovered that the application of skin coloring agents and their effects can be better controlled, when applied as a composite transfer system, rather than as a cream or paste, for example.

A subject of the present invention is therefore a system for transferring a colored pattern onto the skin, characterized in that it comprises: i) a support layer 1, - ii °) an adhesive matrix 2 comprising at least one coloring agent for the skin and at least one adhesive polymer, the support layer 1 being impermeable to the coloring agent for the skin.

Preferably, the adhesive matrix is a means of at least partial transfer of the coloring agent. According to a preferred embodiment of the invention, the coloring agent is present in the adhesive matrix at least on a part, preferably over practically the entire surface, of the adhesive matrix intended to be brought into contact with the skin.

The system according to the invention makes it possible to create decorative patterns on the skin in a safe, simple, comfortable and inexpensive manner. Indeed, the use of this system does not involve external tools, so it is safe and painless. In addition, the predrawn shapes avoid unsightly effects and "failures" (smearing, etc.) which may be due to the inexperience of the user. The pattern obtained is homogeneous. In addition, the makeup thus obtained by coloring is not in relief because it leads to a transfer of color from the system to the skin. This allows the user to keep his freedom of movement under reasonable conditions of use, without fear of damaging the makeup by contact with clothing or any other material coming into contact with the skin thus made up.

The use of the transfer system according to the invention is extremely easy: it suffices to apply the system to the place on the body where one wishes to create a pattern for the desired time for the desired intensity and then to remove the system . A decorative pattern is then obtained which will remain on the skin, under normal conditions of use, generally at least six hours, for example from more than six hours to a few weeks. The decorative pattern will be eliminated over time by successive washing and / or peeling. We can therefore speak of semi-permanent coloring.

The composition comprising the dye being protected by an impermeable membrane, it does not risk staining clothing or another part of the body. The user is free to move during the entire time of the application. The duration of the application and therefore the intensity of the resulting coloration can be controlled at will. In addition, the dyes are not subjected to air oxidation or degradation by UV radiation, they are stable and are more effective.

The transfer system of the present invention has a composite structure made up of at least two elements: a first element is the support layer, occlusive, that is to say made of a material impermeable to the coloring agent of the skin so as to prevent its evaporation and facilitate contact with, and transfer to, the skin and avoid stains on clothing; a second element is the adhesive matrix fixed to the support layer and comprising at least one adhesive polymer and the skin coloring agent, this matrix being able to come directly into contact with the skin; the system can possibly comprise other adhesive layers or not such as for example, a peelable protective layer, hermetically covering the matrix, so as to protect it from any external contamination during the storage time prior to use of the system , or an adhesive layer used to ensure the adhesion of the patch to the skin, or a stencil layer. According to a preferred embodiment, the matrix as defined above is a whole, that is to say that it is difficult on the macrospic and microscopic scale to differentiate the adhesive polymer and the coloring agent from the skin.

Other characteristics, aspects and advantages of the present invention will appear on reading the detailed description which follows.

The support layer of the system according to the invention must be occlusive, that is to say made of a material impermeable to the coloring agent of the skin, so as to prevent the evaporation of the latter and to facilitate its contact with the surface of the skin. Advantageously, the use of a color pattern transfer system according to the invention comprising such an occlusive layer means that the increase in color on the skin is favored under the occlusive conditions. application of said system, leading to a semi-permanent coloring of the skin according to the invention. Such an occlusive support layer also preferably preserves the coloring agent of the skin from air oxidation. It comprises a film structure which may consist of, or comprise, a woven or non-woven, natural or synthetic fibrous material; among the materials suitable for producing the support layer, mention may be made of high or low density polyethylenes, polypropylenes, polyvinyl chlorides, polyolefins, polyamides, polystyrenes, polytetrafluoroethylenes, cellophanes, cellulose acetates, polyesters such as polyethylene phthalate, ethylene-vinyl acetate and polyurethane copolymers, latex films, produced for example from aqueous dispersions of polyester-polyurethane or polyether-polyurethane particles and at least a plasticizing agent, and / or the complexes of these materials and / or the like. These materials can also be present in laminated form with at least one metal sheet such as an aluminum sheet for example.

The support layer not only has the function of supporting the adhesive matrix, but also of feeling a protective coating of the latter. It can be of the same dimension as the adhesive matrix or extend beyond the latter and towards the outside: in the latter case, it can itself be adhesive or receive adhesive means disposed at the periphery of the matrix , and thus contribute to the adhesion of the transfer system to the skin.

In an advantageous embodiment of the invention, the support layer is adhesive and extends beyond the periphery of the adhesive matrix. The support layer may for example be made of adhesive nonwoven.

In an advantageous embodiment of the invention, the support layer is opaque and comprises UV filters in order to protect the coloring agent from UV radiation. It can for example comprise one or more filters chosen from derivatives of dibenzoylmethane, benzophenone, triazines, cinnamates and / or mixtures thereof. The support layer can also include a perfume: a perfumed transfer system is then obtained.

The support layer may be of any suitable thickness to provide the desired support and protection functions. For example, it can have a thickness ranging from 0.02 mm to 1.5 mm approximately.

Advantageously, the support layer is sufficiently flexible so as to be able to perfectly match the profile of the skin and not to cause the user a feeling of discomfort.

The adhesive matrix is fixed to the support layer and comprises at least one adhesive polymer and the coloring agent. It is a whole as explained above. The fixing method is a conventional coating method well known to those skilled in the art, comprising deposition using at least one roller, and evaporation, by heat or infrared, if necessary.

In general, the adhesive polymer is present within the adhesive matrix in the form of a polymeric composition: the adhesive polymers which can smell basic to this composition are pressure-sensitive adhesives, i.e. materials that adhere instantly to the skin under the application of low pressure. Among these adhesive polymers, mention may be made of acrylic adhesive polymers, silicone adhesive polymers, polyisobutylenes and / or mixtures thereof. Mention may in particular be made of the acrylic polymers sold under the trade name "GELVA" by the company Monsanto or under the trade name "DURO-TAK" by the company National Starch, the silicone polymers sold under the trade name "BIO-PSA X7- 4302 Silicone "by Dow Corning.

Preferably, the adhesive polymer is chosen from acrylic adhesive polymers. Preferably, the adhesive polymer is present in the adhesive matrix at a content of up to 98% by weight, more preferably ranging from 2 to 98%, by weight, relative to the total weight of the matrix.

The adhesive matrix may optionally comprise polymers which aid in better cohesion of the matrix: mention may be made of the copolymer of butyl methacrylate and methyl methacrylate sold under the trade name "Plastoid B" by the company ROHM.

According to a first variant of the invention, the coloring agent is dispersed and / or solubilized within the polymer composition.

According to a second variant of the invention, the adhesive matrix further comprises a reservoir comprising a gel in which the coloring agent is dissolved. The polymeric composition of the adhesive matrix is then permeable to the coloring agent of the skin; it can take the form of an underlay which can alternatively take the sandwich tank (Fig. 2a) or simply cover the tank (Fig. 2b). A patch with reservoir is for example described in FR-A-2,738,744.

The gel can comprise a lipophilic or hydrophilic gelling agent. Among the lipophilic gelling agents, mention may be made of waxes of vegetable, animal or mineral origin, hectorites modified with quaternary ammonium, such as the products sold under the trade name "Bentone" by the company Rheox, copolymers of the polystyrene / polyisoprene type, polystyrene / poly-butadiene such as those sold under the name 'LUVITOL HSB' by BASF or those of the polystyrene / copoly (ethylene-propylene) type or also of the polystyrene / copoly (ethylene-butylene) type such as those sold under the brand 'KRATON' by Shell Chemical Co or Gelled Permethyl 99A by Penreco, modified polyamides such as those sold under the trade name "Uniclear 80" and "Uniclear 100" by the company Busch Boake Allen. In a preferred embodiment of the invention, the gel comprises a hydrophilic gelling agent.

Among the hydrophilic gelling agents, mention may be made of cellulose derivatives such as cellulose, carboxymethylcellulose, hydroxypropylcellulose, methylcellulose, hydroxypropylmethylcellulose or hydroxyethylcellulose as well as celluloses modified in particular by grafting an alkyl group, acrylic derivatives such as the products sold under the trade name "Carbopols" by the company Goodrich, polysacharrides such as algae extracts such as agar-agar, carrageenans (iota, kappa, lambda), alginates, in particular of Na or Ca, exudates from microorganisms such as xanthan gum and its derivatives such as the product sold under the trade name "Rheosan" by the company Rhodia Chimie, gellan, fruit extracts such as pectins, agents animal gelling agents such as protein derivatives, in particular gelatin, beef or fish, caseinates, polysacchari having a side chain and 6 neutral sugars as described in document FR-A-2759377, associative polymers, clays, and / or mixtures thereof.

According to the present invention, the term “skin coloring agent” is intended to mean a compound having a particular affinity for the skin enabling it to impart to the latter a lasting artificial coloring optionally by reacting with the amino acids of the skin or by accumulation and / or diffusion of coloring agents in the stratum corneum. By lasting coloring is meant a coloring which resists both rubbing and being washed several times with a solution containing surfactants. Such a lasting coloration is therefore distinguished from the surface and momentary coloration provided for example by a makeup product based on pigments.

Such coloring has the advantage of not rubbing off and of not transferring onto supports with which the skin may be brought into contact such as clothing, other parts of the body, etc. Thus, the coloring agents which can be used according to the present invention are chosen from dyes, of vegetable or synthetic origin, lipodispersible or liposoluble, lacquers which result from the fixing of a vegetable or synthetic dye on an inorganic support or on a polymer. , direct dyes, fluorescent, photochromic or thermochromic dyes and / or mixtures thereof.

Among the lipodispersible dyes, mention may be made of extracts of dye plants, such as, for example, Aleurites Moluccana Willd, Alkanna Tinctoria Tausch, Areca Catechu L, PArrabidaea Chica E. and B., Bixa Orellana L (annatto) , Butea Monosperma Lam, Caesalpina Echinata Lam, Caesalpina Sappan L., Calophylium Inophyllum L., Carthamus Tinctorius L., Cassia Alata L., Chrozophora Tinctoria L., Crocus Sativus L., Curcuma Longa L., Diospyros Gilletii de Wild, Eclipta Prostrata L., Gardenia Erubescens Stapf. and Hutch., Gardenia Terniflora Schum. and Thonn., Genipa Americana L., Genipa Brasiliensis L., Guibourtia Demeusei (Harms) J. Léon, Haematoxylon Campechianum L., Helianthus annuus, Humiria Balsamifera (Aubl.) St-Hil. , Isatis Tinctoria L., Mercurialis perenis, Monascus purpureus, Monascus ruber, Monascus pilosus, Morus Nigra L., Picramnia Spruceana, Pterocarpus Erinaceus Poir., Pterocarpus Soyauxii Taub., Rocella Tinctoria L ., Rothmannia Whitfieldii (Lindl.) Dand., Schlegelia Violacea (Aubl.) Griseb., Simira Tinctoria Aublet, Stereospermum Kunthianum Cham., Symphonia Globulifera L., Terminalia Catappa L., Sorghum, Aronia melanocarpa, naphthoquinone including làwsone, from Lawsonia Inermis L. also called henna or Impatiens Balsamina, red wood extracts as described in document WO98 / 44902, beet juice, anthocyanins such as extracts of red fruits, dihydroxyacetone, mono or polycarbonylated derivatives such s that isatin, alloxane, ninhydrin, glyceraldehyde, mesotartaric aldehyde, pyrazoline-4,5-dione derivatives, and mixtures thereof, these skin coloring agents may or may not be associated with direct dyes or indole derivatives, and / or mixtures thereof. These extracts of dye plants can be in the form of lyophilisate, paste, or even a solution: generally, the leaves of the dye plant are ground to obtain a powder. This powder is dissolved in an aqueous phase for a few hours. The mixture is then centrifuged and then filtered. The filtrate obtained is frozen and then lyophilized.

Among the liposoluble dyes, there may be mentioned Sudan Red III (name CTFA D&C red 17), lutein, quinizarin green (name CTFA DC green 6), Alizurol SS purple (name CTFA DC purple N ° 2) , carotenoid derivatives such as lycopene, beta-carotene, bixin, capsantein, and / or mixtures thereof. Such liposoluble dyes correspond to a preferred color pattern transfer system according to the invention.

Among the synthetic dyes, mention may be made of dye complexes such as, for example, those produced by complexing conventional synthetic dyes with lysine palmitate-myristate and dipropylene glycol: mention may therefore be made of the eosin (10%) / palmitate-myristate complex of lysine / dipropylene glycol sold under the trade name "MMB red 21/1 OR" by the company Phytocos.

Examples of lacquers that may be mentioned include aluminum lacquers, curcumin lacquers, in particular the product marketed under the trade name "Eurovit curcumin Iake" by the company Warner Jenkinson, coated phloxine B lacquer perfluoropolymethylisopropyl ether ethoxyl phosphate sold under the trade name "D&C Red # 27 Al Iake" by the company Cardre, tartrazine lacquer coated with polydimethylsiloxane sold under the trade name "Chroma wrap yellow 5 aluminum Iake" by the company Enhance Technologies; calcium lakes, such as burgundy red B in a mixture of acrylate / water copolymers sold under the trade name "Rubis Covacryl WNL 4723", or red Lithol B coated with polydimethylsiloxane sold under the trade name "Chroma wrap red 7 calcium Iake" by Enhance Technologies, zirconium, barium, barium-strontium lakes and / or mixtures thereof. Mention may also be made of direct dyes such as benzene nitro dyes, nitrophenylenediamines, nitrodiphenylamines, nitroanilines, nitro phenol ethers or nitrophenols, nitropyridines, anthraquinone dyes, mono- or di-azo dyes, triarylmethanics, , acridinic and xanthenic, or metalliferous dyes and / or their mixtures.

The coloring agent can also be heated prior to its incorporation into the matrix of the system according to the invention in order to modify its color. Thus, it is possible to heat naphthoquinones up to 90 ° C in order to make their color darker.

Preferably, the skin coloring agent is present in the adhesive matrix according to the present invention in proportions sufficient to give the skin, after application, a coloring. It is thus generally present in proportions ranging from 0.5 to 50% by weight of active material relative to the total weight of the adhesive matrix, and preferably ranging from 10 to 35% by weight of active material relative to the total weight of the adhesive matrix.

In a preferred embodiment of the invention, the skin coloring agent is chosen from liposoluble dyes. In a still more preferred form, the agent for coloring the skin is Sudan Red II, beta-carotene or bixin.

The adhesive matrix according to the invention can also comprise a film-forming polymer in the form of particles in aqueous dispersion, generally known under the name of latex or pseudolatex. In the present application, the term "film-forming polymer" means a polymer capable of forming on its own or in the presence of an auxiliary film-forming agent, an isolable film.

Among the film-forming polymers which can be used in the present invention, mention may be made of synthetic polymers, of radical type or of polycondensate type, polymers of natural origin, and mixtures thereof. As commercial products, mention may be made of the acrylate copolymer sold under the trade name “Néocryl BT-24” by the company Zeneca, the mixture of polyvinylpyrrolidone / polyurethane (1/1) in water at 15% sold under the name “Aquamere H-1511” by HYDROMER INC., the acrylic copolymer in aqueous dispersion at 60% sold under the trade name “Neocryl A-523” by ZENECA RESINS.

The adhesive matrix according to the invention can also comprise at least one antioxidant agent in order to stabilize the coloring agent such as for example phytic acid; it can also comprise at least one sequestering agent such as sodium diethylenetriamine pentamethylenephosphonate sold under the trade name "Dequest" by the Company Monsanto.

The adhesive matrix according to the invention can also comprise agents which modify the shade of the color: mention may be made of lactic acid and egg protein (ovomucin) which darken the color. These agents can be present in the matrix at a concentration of up to 5% by weight, relative to the weight of the matrix.

The matrix according to the invention can also contain one or more sunscreens active in UVA and / or UVB (absorbers), hydrophilic or lipophilic, or even metallic oxide pigments coated or not.

The matrix of the present invention can also comprise conventional cosmetic adjuvants in particular chosen from organic solvents such as alcohols, glycols, lower polyols, ionic thickeners or not

, ionic, softeners, anti-free radical agents, opacifiers, stabilizers, emollients, silicones, α-hydroxy acids, anti-foaming agents, hydrating agents, vitamins, perfumes, preservatives, surfactants , fillers, polymers, propellants, basifying or acidifying agents, repellants or any other ingredient usually used in the cosmetic and / or dermatological field and their mixtures. Of course, those skilled in the art will take care to choose the optional compound (s) mentioned above and / or their amounts in such a way that the coloring properties of the coloring agent used are not, or not substantially, altered by the planned addition (s).

The transfer system according to the invention can optionally also comprise at least one other layer, adhesive or not: this layer can for example be a regulatory membrane, it can optionally include one or more cosmetic active agents, it can be a predesigned layer in paper or material impermeable to the coloring agent and serving as a stencil. Depending on its function, this layer can be arranged either between the adhesive matrix and the support layer or over the adhesive matrix.

In an advantageous embodiment of the invention, the system further comprises a peelable protective layer covering the adhesive matrix.

In another embodiment of the invention, the system also includes a stencil layer.

When the transfer system is protected by a peelable protective layer, this is removed at the time of use. It can be made of any material impermeable to the coloring agent of the skin as well as to any other component present in the adhesive matrix. Among the materials that can be used, there may be mentioned preferably a sheet of silicone paper or a sheet of thermoplastic material treated to make it non-stick, for example using a varnish. Preferably, this peelable protective layer is made of polyethylene.

In the case where the system according to the invention comprises a peelable protective layer, the adhesive matrix comprising the coloring agent being protected within the system both by the support layer and by the peelable protective layer, the system can be easily transported, in a bag for example, and can be used for travel, for example. It is therefore extremely practical, quick and easy to use.

The transfer system according to the invention can have any desired shape and any dimension, corresponding to the intended use; it can be adapted to the skin surface intended to receive makeup. Its adhesion to the skin is of course reversible. Preferably, it represents a decorative motif which it is desired to transfer to the skin and then keep on the skin for a period which can vary from several hours to several weeks. The transfer system according to the invention can comprise an integrated stencil layer, covering the adhesive matrix, or separate, and to be applied to the skin before applying the system: in this case, the system can have any shape, the design on the skin being produced by the stencil. In another variant, the transfer system can itself represent a decorative motif.

It is also possible to produce systems according to the invention in several colors using different coloring agents, distributed in different places of the matrix, possibly in different layers or reservoirs. A decorative pattern in several colors is thus obtained on the skin.

FIG. 1 illustrates an embodiment of the invention in which the transfer system comprises a support layer 1, an adhesive matrix 2 in which the coloring agent is dissolved and / or dispersed. The system also includes a peelable protective layer 3.

Figures 2a and 2b illustrate an embodiment of the invention in which the matrix 2 comprises a reservoir 4, which comprises the coloring agent, and a sublayer 5 which comprises the adhesive polymer. FIG. 2a illustrates the case where the reservoir is sandwiched by the sublayer 5. FIG. 2b illustrates the case where the reservoir is sandwiched between the sublayer 5 and the support layer 1. FIG. 3 illustrates an embodiment of the invention in which the support layer 1 is adhesive and extends beyond the periphery of the adhesive matrix 2.

i

FIG. 4 illustrates the case of a transfer system according to the invention further comprising a regulating membrane 6 and a stencil layer 7. In this figure, the support layer 1 is adhesive and extends beyond the periphery of the adhesive matrix 2 and beyond the periphery of the regulatory layers 6 and stencil 7. The system also includes a protective film layer 3.

FIG. 5 illustrates a separate stencil which can be used with any system according to the invention, by applying it between the skin and said system.

The subject of the present invention is also a process for semi-permanent coloring of the skin comprising the following steps:

1) a transfer system as defined above is applied to the skin for a sufficient period of time,

2) the skin transfer system is then removed.

The transfer system according to the invention can be used, after removal of the peelable protective layer if necessary, on the surface of the skin which it is desired to decorate, by applying the system directly to said surface.

The duration of application can vary depending on the coloring agent used, depending on the concentration of said coloring agent within the matrix.

, adhesive and depending on the intensity of the desired color on the skin. In fact, the total or partial transfer of the coloring agent from the adhesive matrix into the stratum corneum of the skin will depend on the time of application to the latter of the system. By sufficient duration is meant, within the meaning of the present invention, a duration necessary for the coloring agent to develop its color on the skin. Generally, this duration can range from 2 minutes to 15 hours, preferably from 6 minutes to 12 hours. The system can thus be applied overnight without fear of staining clothing or other parts of the body due to the protective function of the support layer. The system is then simply peeled off from the skin and a semi-permanent decorative pattern is obtained on the skin, obtained by transfer of the coloring agent from the adhesive matrix into the stratum corneum of the skin, this pattern possibly remaining on the layer. superficial skin up to several weeks.

According to a preferred embodiment of the invention, a mixture is produced from a polymer, in particular an acrylic polymer, dissolved in a solvent such as an alcohol, for example ethyl or ethyl acetate. The coloring agent and optionally the other optional compounds of the adhesive matrix are added to the mixture. The mixture is deposited on a non-adherent surface, in particular a silicone polyethylene. Solvents are evaporated at a temperature between 30 ° C and 100 ° C. An adhesive layer is thus obtained, on which a support is deposited.

According to another embodiment of the present invention, in the case of a silicone or polyurethane matrix, the polymer matrix constituting the polymer layer is prepared by intimate mixing with stirring of a silicone or polyurethane prepolymer, the coloring agent and. other optional compounds of matrix 2.

To the mixture thus obtained, a crosslinking catalyst is then added at low temperature, generally at room temperature, if the prepolymer is a silicone polymer, or an isocyanate or polyisocyanate if the prepolymer is a polyester-polyol or a polyether-polyol. .

The mixture is then introduced into a hopper and poured onto a polyethylene sheet for example. Downstream of the hopper is disposed a doctor blade making it possible to equalize the thickness of the polymer layer of the polymer matrix, this thickness generally being between 10 μm and 300 μm. Then applied, before calendering, a sheet of the support layer, occlusive or not, which may also be a sheet of polyethylene.

The polymerization or polyaddition is preferably carried out at room temperature, this in order not to deteriorate the coloring agent. Generally, the polymerization or polyaddition is complete after approximately 24 hours at room temperature.

After calendering and before the polymerization or polyaddition is complete, the composite structure obtained can be immediately cut to the desired shapes, which makes it possible to obtain gripper edges avoiding any pouring phenomenon.

When the adhesive matrix comprises a reservoir, a matrix without the coloring agent is produced as above. The gel which comprises the coloring agent is produced separately according to the conventional methods known to those skilled in the art. This gel is then injected into the polymer matrix before calendering.

Concrete, but in no way limiting, examples illustrating the invention will now be given.

EXAMPLE 1:

A color pattern transfer system according to the invention is prepared, as shown in FIG. 1 with the exception that there is no peelable protective layer 1. The support layer 3 consists of '' a layer of 2 cm x 2 cm in non-woven polyamide with a thickness of 1 mm. The adhesive matrix 2 is produced as follows: A matrix is produced by adding 10 g of bixin and 2 g of sorbitan monoleate to 88 g of acrylic / vinyl acetate copolymer in 50% solution in ethyl acetate.

The mixture is stirred at room temperature until homogenized. After removing the air bubbles, the mixture is applied by means of a conventional coating device to the layer 3 of polyamide support, then heated for about 15 min in the oven at 75-80 ° C to evaporate the acetate. 'ethyl.

A color pattern transfer system according to the invention is thus obtained.

The application is made to the skin (forearm of a person), the application times varying from 20 min to 12 hours. One thus obtains, after removal of the transfer system, a colored marking on the skin of red-orange tone, the intensity of the color being all the stronger the longer the duration of application.

Claims

1. Color pattern transfer system on the skin, characterized in that it comprises: - i °) a support layer 1,

- ii °) an adhesive matrix 2 comprising at least one coloring agent for the skin and at least one adhesive polymer, the support layer 1 being impermeable to the coloring agent for the skin.

2. System according to claim 1 such that the adhesive matrix is a means of at least partial transfer of the coloring agent.

3. System according to claim 2 such that the coloring agent is present in the adhesive matrix at least on a part, preferably over practically the entire surface of the adhesive matrix intended to be brought into contact with the skin.

4. System according to one of the preceding claims such that the support layer 1 comprises a film structure consisting of, or comprising, a woven or non-woven, natural or synthetic fibrous material.

5. System according to one of the preceding claims, such that the material is chosen from high or low density polyethylene, polypropylenes, polyvinyl chlorides, polyolefins, polyamides, polystyrenes, polytetrafluoroethylenes, cellophanes, acetates of cellulose, polyesters, ethylene-vinyl acetate and polyurethane copolymers, latexes and / or complexes of these materials and / or the like.

6. System according to one of the preceding claims, such that the support layer is adhesive and extends beyond the periphery of the adhesive matrix.

7. System according to one of the preceding claims, such that the support layer comprises at least one UV filter.

8. System according to one of the preceding claims, such that the support layer has a thickness ranging from 0.02 mm to 1.5 mm approximately.

9. System according to one of the preceding claims, such that the adhesive polymer is present within the adhesive matrix in the form of a polymer composition.

10. System according to one of the preceding claims, such that the adhesive polymer is chosen from acrylic adhesive polymers, silicone adhesive polymers, polyisobutylenes and / or mixtures thereof.

11. System according to one of the preceding claims, such that the adhesive polymer is chosen from acrylic adhesive polymers.

12. System according to one of the preceding claims, such that the adhesive polymer is present in the adhesive matrix at a content which can range up to 98% by weight, more preferably ranging from 2 to 98% by weight, relative to the total weight of the matrix.

13. System according to one of the preceding claims, such that the matrix further comprises a copolymer of butyl methacrylate and of methyl methacrylate.

14. System according to one of claims 9 to 13 such that the coloring agent is dispersed and / or solubilized within the polymeric composition.

15. System according to one of claims 9 to 13 such that the adhesive matrix further comprises a reservoir comprising a gel in which the coloring agent is dissolved.

16. The system of claim 15 such that the polymeric composition is permeable to the coloring agent of the skin.

17. The system of claims 15 or 16 such that the gel comprises a hydrophilic gelling agent.

18. System according to one of the preceding claims, such that the skin coloring agent is chosen from dyes, of vegetable or synthetic origin, lipodispersible or liposoluble, lacquers, direct dyes, fluorescent dyes, photochromes or still thermochromes and / or their mixtures.

19. System according to one of the preceding claims, such that the skin coloring agent is present in the adhesive matrix according to the present invention in proportions ranging from 0.5 to 50% by weight of active material relative to the weight. total of the adhesive matrix, and preferably ranging from 10 to 35% by weight of active material relative to the total weight of the adhesive matrix.

20. System according to one of the preceding claims, such that the skin coloring agent is chosen from liposoluble dyes.

21. System according to the preceding claim such that the agent for coloring the skin is Sudan Red II, beta-carotene or bixin.

22. System according to one of the preceding claims, such that the adhesive matrix comprises at least one antioxidant agent.

23. System according to one of the preceding claims, such that the adhesive matrix comprises at least one sequestering agent.

24. System according to one of the preceding claims, such that the adhesive matrix comprises at least one color-modifying agent chosen from lactic acid and egg protein.

25. System according to one of the preceding claims, such that the adhesive matrix comprises at least one or more sun filters active in UVA. and / or UVB, hydrophilic or lipophilic, or even metallic oxide pigments coated or not.

26. System according to one of the preceding claims, such that the adhesive matrix also comprises conventional cosmetic adjuvants in particular chosen from organic solvents such as alcohols, glycols, lower polyols, ionic or nonionic thickeners, softeners, anti-free radical agents, opacifiers, stabilizers, emollients, silicones, α-hydroxy acids, anti-foaming agents, hydrating agents, vitamins, perfumes, preservatives, surfactants, fillers, polymers, propellants, basifying or acidifying agents, repellants or any other ingredient usually used in the cosmetic and / or dermatological field and their mixtures.

27. System according to one of the preceding claims as it comprises at least one other layer, adhesive or not.

28. The system of claim 27 such that it further comprises a peelable protective layer covering the adhesive matrix.

29. System according to one of the preceding claims, as further comprising a stencil layer.

30. A method of semi-permanent coloring of the skin comprising the following steps:

1 °) a transfer system as defined in any one of claims 1 to 29 is applied to the skin for a sufficient period of time, 2 °) the transfer system is then removed from the skin.

31; Method according to the preceding claim, such that the duration ranges from 2 minutes to 15 hours, preferably from 6 minutes to 12 hours.