EP2208620B1 - Decorating assembly comprising a modular magnetisation device - Google Patents

Abstract

The assembly has a container that contains fluid composition having magnetic substances, and a magnetization device (8) to produce a pattern on a substrate i.e. nail (7), onto which the composition is deposited. The magnetization device has first and second magnets (10, 11), where one of the magnets is in the form of a flexible sheet. The magnets are partially superposed such that magnetic field lines of the first magnet are positioned at a right angle relative to magnetic field lines of the second magnet, where the sheet is made of a thermoplastic or resin material. An independent claim is also included for a method for decorating a substrate using a packaging assembly.

Description

The present invention relates to a set useful for decorating a substrate. In particular, it finds its utility in the field of cosmetic products where the consumers of these products wish to obtain different make-up effects without multiplying the number of different compositions necessary to obtain these effects. The invention is also applicable in the field of packaging where different decors are desired from a limited number of means, and limiting the number of changes to operate on the manufacturing lines of said packaging.

"Cosmetic product" means a product as defined in Council Directive 93/35 / EEC of 14 June 1993.

Document is known WO06 / 037900 a composition containing magnetizable bodies arranged in an assembly comprising means for depositing a quantity of this composition on a substrate and then subjecting it to a magnetic field, in order to freeze an orientation of the magnetizable bodies in the composition deposit as and when that the composition freezes itself.

Document is also known EP-1759610 a perfecting of such a type of ensemble.

In a completely different field of application, except cosmetics, the document WO-2008/046702 discloses a method and means for patterning a bank note with magnetically oriented particles when deposited on the note.

The object of the present invention is to obtain a plurality of decorative effects from a composition to be spread, which intrinsically does not have the desired decorative effect when it is spread out, but which can be brought to the surface. present when subjected to a magnetic field. For this purpose, the present invention provides an assembly comprising the composition to be spread contained in a container and a modulated magnetization device. Advantageously, the magnetization device may be adjustable such that it can provide at least two patterns of lines of different magnetic fields.

The subject of the invention is an assembly comprising a container containing a fluid composition comprising magnetic bodies and a magnetization device making it possible to produce a pattern on a substrate on which said composition has been deposited, this magnetization device comprising a support and two magnets, at least one of which is in the form of a flexible sheet, the two magnets being at least partially superimposed so that the field lines which they generate in association with one another result from the interference between the field lines of each of the magnets, characterized in that the magnetization device comprises a concave front face.

The magnets according to the invention have a remanent magnetization, and or permanent, in the absence of a magnetic field.

By flexible sheet is meant a structure of small thickness relative to its dimensions in width and length. This structure is deformable under the exercise of a manual constraint. In particular, this structure is deformable in at least one dimension, namely that it can be deformed manually in its length and in its width.

The advantage of the flexible sheet is that it can be easily shaped in different positions and thus modify the field lines that it generates in a plane.

The advantage conferred by such an embodiment of the magnetization device is understood when it is compared, in its manufacturing process to that of solid magnets pure ferrite or rare earth.

Indeed, such solid magnets are difficult to shape. They are not adaptable. The patterns proposed by solid magnets, once finalized, are not modifiable them either. Moreover, they are expensive to implement because they require the implementation of several steps, and in particular the step magnetization of the ferrite by a magnetization head is very expensive. Indeed, the only magnetization heads capable of magnetizing solid substrates are made of copper wire. Now it is necessary to replace these magnetization heads regularly because the rates and temperatures to which they are led lead to the melting of the copper son, and the loss of the desired magnetization pattern. These magnetization heads are subject to significant thermal and mechanical stress.

The soft sheet magnets are rolled into sheets and / or rolls and can be magnetized after rolling, while the material for forming the sheet is passing from liquid to solid state. The magnetization heads used are less fragile. These flexible sheets may be polarized on one or both opposite sides of the sheet.

The flexible sheets are deformable and therefore can adapt to the shape of the substrate to be decorated, especially when the substrate has curved surfaces.

In particular, the concave front face of the magnetization device is particularly adapted to the natural concavity of a nail to make up, in order to obtain a pattern on the entire surface of the nail. Similarly, one can use such magnetization devices according to the invention for the packaging completion having curved surfaces. Likewise, the magnetization devices according to the invention are particularly useful for makeup of the convex parts of the body, such as the lips, the cheeks, or any other surface area projecting from the body.

For example, the magnet in the form of a flexible sheet may form a front face of the magnetization device intended to be placed closest to the substrate.

In particular, one can choose to have the magnet of lower magnetic power among the two magnets, so that it forms a front face of the magnetization device intended to be placed closest to the substrate. Such an arrangement is advantageous for allowing the weakest magnet to have visible interference in the pattern resulting from the interference between the field lines of each of the magnets.

For example, the concave front face of the magnetization device may comprise at least one vertex where the radius of curvature is between 4 and 20 mm, in order to propose also concave field lines and thus allow uniform formation of a pattern on a substrate that would be convex. Advantageously, the radius of curvature of the concave front face is chosen so that it is complementary to the convex substrate to be decorated.

In particular, the two magnets can be secured to one another and their respective position can be fixed. For example, the two magnets can be immobilized relative to each other. For example, they are glued together via a film having two opposite adhesive faces.

In particular, the two magnets can be arranged to allow modifications of the field lines that they generate in association with each other, one of the two magnets being movable relative to the other of the magnets.

For example, a first magnet is held in a fixed position relative to the support of the magnetization device. A second magnet of the magnetization device may be movably mounted about an axis of rotation relative to the support and may be mounted to move relative to said support.

The support may comprise a fixing means to be retained on the container comprising the composition. Thus the handling of the whole can be facilitated. For example, in the case where the container is a bottle with a neck, then the support may include an opening to engage around the neck. In the case where the assembly comprises an applicator mounted integral with a closure member of the container, the closure member may cooperate with the magnetization device to hold it integral with the container.

Preferably, an assembly according to the invention is useful for a substrate consisting of a fingernail, and in this case the support may be adapted to receive said fingernail. For this purpose, the support may comprise a first abutment forming a bearing zone for the end of this nail to expose to the magnetic field generated by the magnets of the magnetization device. Alternatively, and or in addition, when the substrate is a fingernail, the magnetization device may comprise a second abutment for bearing on the top of the finger, when the fingernail is exposed to the magnetic field generated by the magnets. The location of the nail relative to the magnetic field can thus be better controlled, and it can thus avoid the contact of the nail covered with the composition with the magnetization device.

For example, one of the magnets of the magnetizer may be multipolar. By multipolar is meant a structure which comprises several zones generating a magnetic field and spaced apart from each other.

Advantageously, the two magnets can be both in the form of flexible sheet and or be multipole.

According to a preferred embodiment, the magnet in the form of flexible sheet may be formed by the inclusion of magnetized particles in a sheet made of thermoplastic material or resin. The magnetized particles may be chosen from the list defined below for the magnetic bodies. For example, the magnetized particles may be unipolar ferrite particles. When the material is a resin, this material may be an elastomer. In particular, the magnetized particles may be arranged to form straight lines, possibly parallel to each other, in the sheet.

For example, the two magnets can be identical. Advantageously, they are chosen of different magnetic power. Both magnets can both be in the form of flexible sheet and be multipolar.

In the case where the two magnets are sheets creating lines of magnetic fields parallel to each other, then depending on the position of a first sheet relative to the second sheet, or the lines of fields respectively created remain parallel to each other, possibly overlapping or they intersect. When a formula containing magnetic bodies is applied to a substrate, the latter will orient and regroup along the field lines in order to create on the substrate a pattern that is the replica of the field lines of the magnetization device. .

• on dépose un film de composition fluide sur le substrat, le substrat pouvant être une matière kératinique, par exemple un ongle, la peau ou une muqueuse, telle qu'une lèvre, ou encore une pièce destinée à former un emballage, par exemple un emballage primaire ou secondaire en papier, carton, verre ou plastique dudit ensemble selon l'invention, et
• on soumet le film déposé au champ magnétique généré par le dispositif d'aimantation avant solidification du film.

Advantageously, an assembly according to the invention is used in a method of decorating a substrate comprising the following steps:

• a film of fluid composition is deposited on the substrate, the substrate possibly being a keratin material, for example a fingernail, the skin or a mucous membrane, such as a lip, or a part intended to form a package, for example a package primary or secondary paper, cardboard, glass or plastic of said assembly according to the invention, and
• the deposited film is subjected to the magnetic field generated by the magnetization device before solidification of the film.

In the case where the method is used to form a pattern on a package of the assembly according to the invention, then preferably this pattern reproduces the pattern generated by at least one of the magnetization devices of said assembly.

For example, the magnet in the form of a flexible sheet may be embossed before incorporation into a magnetization device of an assembly according to the invention. It is in this case distorted in its thickness.

• Figure 1 : une vue en perspective de face d'un récipient d'un ensemble selon l'invention ;
• Figure 2 : une représentation particulière de l'étape de dépose d'un film de composition fluide sur un substrat à décorer ;
• Figure 3a : une vue en perspective de face d'un dispositif d'aimantation d'un ensemble selon l'invention ;
• Figure 3b : une vue selon un plan de coupe longitudinal de la figure 3a ;
• Figure 4 : une représentation particulière de l'étape de soumission d'un film déposé sur le substrat à un champ magnétique généré par une première variante de réalisation d'un dispositif d'aimantation selon l'invention avant solidification du film ;
• Figure 5 et 6 : des vues de dessus schématiques des lignes de champs générées par différents dispositifs d'aimantation d'ensembles selon l'invention ;
• Figure 7 : une vue de face en perspective d'une variante illustrative de réalisation d'un dispositif d'aimantation
• Figure 8 : une vue de face en perspective d'une deuxième variante de réalisation d'un dispositif d'aimantation d'un ensemble selon l'invention ;
• Figure 9 : une vue de face en perspective d'une autre variante illustrative de réalisation d'un dispositif d'aimantation;
• Figures 10a et 10b : des vues de dessus schématiques des lignes magnétiques résultant de l'interférence entre les deux aimants selon deux configurations possibles d'un dispositif d'aimantation d'un ensemble selon l'invention.

The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These are presented only as an indication and in no way limitative of the invention. The figures show:

• Figure 1 : a front perspective view of a container of an assembly according to the invention;
• Figure 2 : a particular representation of the step of depositing a film of fluid composition on a substrate to be decorated;
• Figure 3a : a front perspective view of a magnetization device of an assembly according to the invention;
• Figure 3b : a view along a longitudinal sectional plane of the figure 3a ;
• Figure 4 : a particular representation of the step of submitting a film deposited on the substrate to a magnetic field generated by a first embodiment of a magnetization device according to the invention before solidification of the film;
• Figure 5 and 6 schematic top views of the field lines generated by different magnetization devices sets according to the invention;
• Figure 7 : a front view in perspective of an illustrative variant embodiment of a magnetization device
• Figure 8 a front view in perspective of a second variant embodiment of a magnetization device of an assembly according to the invention;
• Figure 9 a front view in perspective of another illustrative variant embodiment of a magnetization device;
• Figures 10a and 10b schematic top views of the magnetic lines resulting from the interference between the two magnets according to two possible configurations of a magnetization device of an assembly according to the invention.

The present invention relates to a set for decoration comprising a container 1 containing a fluid composition comprising magnetic bodies. The definition of magnetic bodies is given below. The fluid composition in which they are contained may be a cosmetic composition when, in particular, the makeup of the keratin materials is desired. The term "keratinous material" is intended to mean keratin materials of human beings, and includes keratin fibers, skin, superficial body growths such as nails and mucous membranes such as the lips.

The composition is fluid, this definition covers any composition capable of being spread on a substrate. In particular, as shown figure 2 , the assembly according to the invention comprises an applicator 2 for spreading the composition taken from the container 1. In particular, the applicator is placed at the end of a rod 3 so as to be soaked in the composition contained in the container 1. This rod 3 is retained integrally inside a closure cap 4 In particular, an opening of the container 1, through which the composition can be taken, is located at the end of a neck of said container 1.

The neck may correspond to a not shown tubular zone erected from a shoulder 5 formed by the side walls 6 of the container 1. In particular, the neck may have a relief, for example a thread, in order to cooperate with a complementary relief provided on the inside perimeter of closure cap 4.

When it comes to applying a varnish on a nail 7, as shown Figure 2 , the applicator 2 is preferably a brush. When it comes to applying a smooth foundation to the skin, the applicator 2 is preferably a sponge tip, such as a foam.

MAGNETIC BODIES

By "magnetic bodies" are meant bodies having a non-zero magnetic susceptibility, that is to say sensitive to the action of a magnetic field and tending for example to align with the field lines. The term "magnetic body" thus encompasses magnetizable bodies.

Preferably, the magnetic bodies used do not exhibit remanent magnetization in the absence of a magnetic field.

The magnetic bodies may comprise any magnetic material having a sensitivity to the lines of a magnetic field, whether this field is produced by a permanent magnet or derived from an induction, this material being for example chosen from nickel, cobalt, iron , their alloys and oxides, especially Fe ₃ O ₄ , and also gadolinium, terbium, dysprosium, erbium, their alloys and oxides. The magnetic material may comprise metal iron, especially soft iron, possibly coated.

The magnetic bodies may or may not have a multilayer structure, comprising at least one layer of a magnetic material, such as for example iron, nickel, cobalt, their alloys and oxides, especially Fe ₃ O ₄ .

The magnetic bodies are preferably aspherical, having for example an elongate shape. Thus, when these bodies are subjected to the magnetic field, they tend to orient themselves with their longitudinal axis in the alignment field lines, and undergo a change of orientation which results in a change of appearance of the composition.

When the magnetic bodies are substantially spherical, preferably their appearance is inhomogeneous, so that a change of orientation induces a change of appearance.

The amount of magnetic bodies is sufficient for the appearance of the composition to depend on their orientation and / or location.

The concentration of magnetic bodies is, for example, between about 0.05 and about 97% by weight, especially between about 0.1 and about 95% by weight, more preferably between about 0.1 and about 90% by weight, for example the order of 3% by mass. The size of the magnetic bodies is for example between 1 nm and 700 μm, better between 1 μm and 500 μm, better still between 10 μm and 150 μm. By "dimension" is meant the dimension given by the statistical size distribution at half of the population, called D50.

Magnetic pigments

The magnetic bodies of the composition may comprise magnetic pigments. Particularly suitable pigments are nacres comprising Fe ₃ O ₄ iron oxide. Pigments having magnetic properties are, for example, those sold under the trade names COLORONA BLACKSTAR BLUE, COLORONA BLACKSTAR GREEN, COLORONA BLACKSTAR GOLD, COLORONA BLACKSTAR RED, CLOISONNE NU ANTIQUE SUPER GREEN, MICRONA MATTE BLACK (17437), MICA BLACK (17260), COLORONA PATINA SILVER (17289) and COLORONA PATINA GOLD (117288) by MERCK or FLAMENCO TWILIGHT RED, FLAMENCO TWILIGHT GREEN, FLAMENCO TWILIGHT GOLD, TWILIGHT BLUE FLAMENCO, TIMICA NU ANTIQUE SILVER 110 AB, TIMICA NU ANTIQUE GOLD 212 GB, TIMICA NU-ANTIQUE COPPER 340 AB, ANCIENT TIMICA NU BRONZE 240 AB, CLOISONNE NU ANTIQUE GREEN 828 CB, CLOISONNE NU ANTIQUE BLUE 626 CB, GEMTONE MOONSTONE G 004, ANTIQUE CLOISONNE NU RED 424 CB, CHROMA-LITE BLACK (4498), CLOISONNE ANTIQUE RED FLAMBE NU (code 440 XB), ANCIENT BRONZE NARROW CLOISONNE (240 XB), CLOISONNE NU ANTIQUE GOLD (222 CB) and CLOISONNE NU ANTIQUE COPPER (340 XB) by the company ENGELHARD.

Mention may also be made of black iron oxide particles marketed by BASF or soft iron-based particles.

Magnetic bodies can be fibers.

Magnetic fibers

The term "fibers" refers to generally elongate bodies, having for example a form factor ranging from 3.5 to 2500 or from 5 to 500, for example from 5 to 150. The form factor is defined by the ratio L / Where L is the length of the fiber and D is the diameter of the circle in which the largest cross-section of the fiber is inscribed.

The cross section of the fibers may be, for example, in a circle with a diameter ranging from 2 nm to 500 μm, for example ranging from 100 nm to 100 μm, or even from 1 μm to 50 μm.

The fibers may have, for example, a length ranging from 1 μm to 10 mm, for example from 0.1 mm to 5 mm, or even from 0.3 mm to 3.5 mm.

The fibers may have a mass ranging, for example, from 0.15 to 30 denier (mass per gram per 9 km of yarn), for example from 0.18 to 18 denier.

The cross-sectional shape of the fibers may be arbitrary, for example circular or polygonal, in particular square, hexagonal or octagonal.

The composition may comprise solid or hollow fibers, independent or interconnected, for example braided.

The composition may comprise fibers having blunt and / or rounded ends, for example by polishing.

The fibers may not have their shape substantially modified when they are introduced into the composition, being for example initially rectilinear and sufficiently rigid to retain their shape. Alternatively, the fibers may have a flexibility allowing them to deform substantially within the composition.

The fibers may comprise a non-zero content, up to 100%, of a magnetic material based on iron, zinc, nickel, cobalt or manganese and their alloys and oxides, in particular Fe ₃ O ₄ , rare earths, barium sulphate, silicon iron alloys, possibly loaded with molybdenum, Cu ₂ MnAl, MnBi, or a mixture thereof, this list not being limiting.

When the composition comprises fibers containing magnetic particles, the latter may be present for example at least on the surface of the fiber, or even on the surface of the fibers only, inside the fiber alone or else be dispersed within the fiber substantially homogeneously.

The fibers may comprise for example a non-magnetic core with a plurality of magnetic particles on its surface.

The fibers may further comprise a synthetic matrix containing a plurality of magnetic grains dispersed therein.

If necessary, a synthetic material filled with magnetic particles may itself be coated with a non-magnetic bark. Such bark constitutes for example an insulating barrier or the magnetic materials of the ambient medium and / or can bring color. The fibers may comprise a monolithic magnetic core and be coated with a non-magnetic bark, or it may be the opposite.

The composition may comprise fibers made by extrusion or co-extrusion of one or more polymeric materials, in particular thermoplastics and / or elastomers. One of the extruded materials may contain a charge of dispersed magnetic particles.

The fibers may comprise a synthetic material chosen from polyamides, PET, acetates, polyolefins, in particular PE or PP, PVC, polyester amide block, plasticized Rilsan ^® , elastomers, in particular polyester elastomers, PE elastomers, silicone elastomers, elastomers of nitrile or a mixture of these materials, this list not being limiting.

The composition may contain composite fibers comprising a magnetic core at least partially coated with at least one non-magnetic, synthetic or natural material. The coating of the magnetic core can be done for example by coextrusion, around the heart, of a bark in a non-magnetic material.

The coating of the core can still be carried out differently, for example by in situ polymerization .

The core may be monolithic or have a charge of magnetic grains dispersed in a matrix.

The composition may also contain composite fibers obtained by coating with a synthetic material, loaded with magnetic particles, a non-magnetic, synthetic or natural core, the core being composed for example of a wood fiber, rayon, polyamide, a plant material, polyolefin, especially polyethylene, nylon ^® , polyimide-amide, aramid, this list is not limiting.

The composition may further comprise magnetic composite particles, in particular a magnetic latex.

Magnetic composite particles

A magnetic composite particle is a composite material consisting of an organic or inorganic matrix and magnetic grains. The magnetic composite particles may thus comprise on their surface and / or within them grains of a magnetic material. The composite particles may consist of a magnetic core coated with an organic or mineral matrix, or vice versa.

The magnetic composite particles comprise for example one of the aforementioned magnetic materials.

The size of the magnetic composite particles is for example between 1 nm and 1 mm, better between 100 nm and 500 μm, better still between 500 nm and 100 μm. By "dimension" is meant the dimension given by the statistical size distribution at half of the population, called D50.

The thesis of C. GOUBAULT, 23 March 2004, incorporated herein by reference, recalls in chapter 1 the state of the art in the field of magnetic composite particles, and lists a process of preparation that can be used to prepare composite particles magnetic, namely a separate synthesis of the magnetic grains and the matrix, a synthesis of magnetic grains in contact with the matrix or a synthesis of the matrix in the presence of magnetic grains.

The company KISKER markets composite magnetic particles with a mineral matrix, composed of silica. The companies DYNAL, SERADYN, ESTAPOR and ADEMTECH propose magnetic particles organic matrix composites, which can also be used in the invention.

More particularly, the ESTAPOR company markets under the reference M1-070 / 60 magnetic latexes consisting of ferrite grains evenly distributed in a polystyrene matrix, this latex comprising 65% of iron oxide, the average diameter of the polystyrene particles being 890 nm and the solids content by weight of 10%.

ferrofluid

The composition may comprise a ferrofluid, that is to say a stable colloidal suspension of magnetic particles, especially magnetic nanoparticles.

The particles, of a size for example of the order of a few tens of nanometers, are dispersed in a solvent (water, oil, organic solvent), either with the aid of a surfactant or a dispersing agent, or by electrostatic interactions.

Ferrofluids are for example prepared by grinding ferrites or other magnetic particles until nanoparticles are obtained which are then dispersed in a fluid containing a surfactant, which is adsorbed on the particles and stabilizes them, or by precipitation in a basic medium. a solution of metal ions.

Each particle of the ferrofluid has a magnetic moment determined by the size of the particle and the nature of the magnetic material.

Under the action of a magnetic field, the magnetic moments of the particles tend to align along the field lines, with the appearance of a non-zero magnetization in the liquid. If the field is canceled, there is no hysteresis and the magnetization vanishes.

Beyond a threshold field value, it is also possible to cause macroscopic changes in the liquid, for example the appearance of peaks or a change in the rheological properties.

The term "ferrofluid" also includes an emulsion of ferrofluid droplets in a solvent. Each drop then contains colloidal magnetic particles in stable suspension. This makes it possible to have a ferrofluid in any type of solvent. The size of the magnetic particles suspended in the ferrofluid is for example between 1 nm and 10 μm, better between 1 nm and 1 μm, better still between 1 nm and 100 nm. By "dimension" is meant the dimension given by the statistical size distribution at half of the population, called D50.

• WHKS1S9 (A, B ou C), qui est un ferrofluide à base aqueuse comportant de la magnétite (Fe₃O₄), ayant des particules de 10 nm de diamètre,
• WHJS1 (A, B ou C), qui est un ferrofluide à base d'iso-paraffine et de particules de magnétite (Fe₃O₄) de 10 nm de diamètre,
• BKS25_dextran, qui est un ferrofluide à base aqueuse stabilisé par du dextran, comportant des particules de magnétite (Fe₃O₄) de 9 nm de diamètre.

Ferrofluids marketed by the company LlQUIDS RESEARCH LTD under the references:

• WHKS1S9 (A, B or C), which is an aqueous ferrofluid having magnetite (Fe ₃ O ₄ ), having particles of 10 nm in diameter,
• WHJS1 (A, B or C), which is a ferrofluid based on iso-paraffin and magnetite particles (Fe ₃ O ₄ ) 10 nm in diameter,
• BKS25_dextran, which is a dextran-stabilized aqueous base ferrofluid, having magnetite (Fe ₃ O ₄ ) particles 9 nm in diameter.

Particle chains and / or magnetic fibers

The composition may further comprise chains of particles and / or magnetic fibers.

The composition may thus comprise agglomerates of particles or fibers whose largest dimension, for example the length, is for example between 1 nm and 10 mm, for example between 10 nm and 5 mm, or between 100 nm and 1 mm, or between 0.5 μm and 3.5 mm, for example between 1 μm and 150 μm. Dimension refers to that given by the statistical size distribution at half of the population, called D50.

Strings of magnetic particles can be obtained for example by assembling colloidal magnetic particles, as described in the publications Permanently linked monodisperse paramagnetic chains, EM Furst, C. Suzuki, M. Fermigier, AP Gast, Langmuir, 14, 7334-7336 (1998). ) "Suspensions of magnetic particles", M. Fermigier, Y. Grasselli, Bulletin of the SFP (105) July 96 , and "Flexible magnetic filaments and micromechanical sensors", C. Goubault, P. Jop, M. Fermigier, J. Baudry, Bertrand E., J. Bibette, Phys. Rev. Lett., 91, 26, 260802-1 to 260802-4 (2003). ), the contents of which are incorporated by reference.

It is in particular described in these articles how to proceed to obtain magnetic latex particle chains comprising a matrix of polystyrene containing iron oxide grains and functionalised at the surface, permanently bonded to each other following a chemical reaction, in particular covalent bonds between the surfaces of the adjacent particles; a method is also described for obtaining ferrofluid emulsion droplet chains, linked together by interactions of a physical nature. The length as well as the diameter of the permanent chains thus obtained can be controlled. Such magnetic chains constitute anisotropic magnetic objects orientable and movable under the effect of a magnetic field.

The dimensions of the magnetic chains can meet the same conditions as the magnetic fibers.

EXAMPLE OF FLUID COMPOSITION

The composition may be a nail polish or any other product to be applied to the skin, superficial body growths or mucous membranes.

In particular, fluid compositions that can be used in an assembly according to the invention are described in the document US-2006-0088484 incorporated herein by reference.

For example, a particular composition for the practice of the invention comprises the compounds indicated below in the following proportions % in weight CITRIC ACID monohydrate 0.06 TARTRAZINE ALUMINUM LACQUER ON ALUMINA (26/74) (CI: 19140: 1 + 77002) 0.435 CALCIUM LACQUER LITHOL B RED ON BARIUM SULFATE (60/40) (CI: 15850: 1 + 77120) 0.05 PIGMENT OF LAMELLAR IRON, GRINDING WHITE OIL (90% PIGMENT -10% SOLVENTS) / GRANULOMETRY 18 μM 1.25 BLACK IRON OXIDE (CI: 77499) 0.2 SILICA-BROWN IRON OXIDE (CI: 77491) 0.7 SILICA TITANIUM-MICA OXIDE TIN-OXIDE (35 / 40.5 / 24 / 0.5) (PARTICLE SIZE 10-60μM) 1.55 NITROCELLULOSE 30% ISO-PROPYL ALCOHOL (VISCOSITY: E22 - 1/2 S) (NITROCELLULOSE IDYL EMV IPA 30% Bergerac) 11.08 NITROCELLULOSE 30% ISO-PROPYL ALCOHOL (AZUR NITROCELLULOSE E80 IPA 30% Bergerac) 4.45 PHTHALIC COPOLYMER ANHYDRIDE / GLYCERIN / GLYCIDYL DECANOATE IN 70% ETHYL ACETATE (BECKOSOL ODE 230 70 E DAINIPPON INK & CHEMICALS) 1.43 PURE ISOPROPYL ALCOHOL 3.14 ETHYL ACETATE QSP 100 ACETYL TRIBUTYL CITRATE 4.35 N-ETHYL O, P-TOLUENESULFONAMIDE 2.99 N-PROPYL ACETATE 17.42 BUTYL ACETATE 16.63 MODIFIED HECTORITY STEARYL BENZYL DIMETHYL AMMONIUM (BENTONE 27 V ELEMENTIS) 11.47 Total 100

MAGNET DEVICE

The magnetization device 8 comprises figure 3 a support 9 and two magnets 10 and 11 superimposed one above the other so that the magnetic field lines they generate respectively interfere with each other so as to define an overall pattern of field lines for said device d magnetization 8.

Figure 3a , the support 9 comprises a wall 12 on which are arranged the two magnets 10 and 11. The two magnets are glued to each other by means of a first double-sided adhesive film 100 arranged between them, which is for example, less than 1/10 mm thick. The wall 12 has a radius of curvature perpendicular to a main elongation axis X of the wall which is 10 mm. As visible on the figure 3b , the wall 12 has a housing 101 configured so that the two magnets are retained. They are there for example retained by means of a second adhesive film 102 stuck on the bottom 103 of this housing. In particular, the housing 101 is configured such that the two magnets can have a front face 104 which is in the continuity of the face of the wall 12 defined around said housing 101. In this case then, the front face 104 magnets then have the same radius of curvature as the face 12.

The magnets are parallel to one face of this wall 12. In this example, the two magnets 10 and 11 are superimposed and are substantially of the same rectangular section. For example, one of the magnets covers the entire surface of the other magnets.

Figures 3a and 3b the wall 12 is connected to a second portion 15 erected substantially perpendicularly to the wall 12. This second portion 15 has means forming a positioning stop for the substrate to be decorated. In the case where this substrate is a nail having at least one portion 16 protruding from the pulp 17 located at the end of a finger, the second portion 15 comprises a relief 18, forming a positioning stop, to engage against a lower face of this nail portion 16. Preferably this relief 18 is erected perpendicular to the second portion 15 and parallel to the wall 12. It has a height such that the pulp of the finger which is abutted against the edge of this relief prevents the contact between the nail and the second portion 15, for lengths of nail portion 16 exceeding the pulp less than 0.5 cm.

As shown Figure 4 for a first embodiment of the magnetization device 8, this wall 12 is connected to a first portion 13 erected perpendicularly to the wall 12. This first portion 13 has an opening 14 of sufficiently large section to be engaged around the container neck 1.

Other means of fixing the magnetization devices according to the invention on the container 1 can be envisaged.

The wall 12, the first portion 13 and the second portion 15 are obtained from a single molding piece.

In the case where the magnets 10 and 11 are obtained from a flexible sheet in which are formed parallel lines between them including permanently oriented magnetized particles, for example sheets called FLEXAM ® marketed by the French company ARELEC, we can observe at least the two field line patterns represented on the figures 5 and 6 when the magnets 10 and 11 are superimposed.

For example, the magnets 10 and 11 are obtained by mixing highly loaded Strontium ferrite powders with a synthetic elastomer. They are for example obtained from an extruded or calendrical mixture of fine sheets having opposite faces perfectly smooth and parallel to each other. The leaves have a hardness of between 60 and 65 Shore D.

Figures 5 the lines of magnetic particles 110, or magnetic lines 110, of the first magnet 10 are superimposed on those 111 of the second magnet 11, and in this case, the pattern generated by the magnetization device 8 will have several patterns of field lines substantially parallel to each other.

On the other hand, Figure 6 , the magnetic lines 110 of the first magnet 10 are arranged at right angles to those 111 of the second magnet 11, and in this case, the pattern generated by the magnetization device will present field lines forming corrugations, or arabesques. The observed amplitude of the undulations is dependent on the respective magnetic forces of each of the magnets. When the power difference between the two sheets is large, the weakest magnetic field is poorly represented within the overall magnetic field created by the magnetization device, and in this case the corrugations are of low amplitude.

In cases where the magnetic magnets are of the same strength, the one at the back tends to be of less importance in the overall motive of the magnet. magnetization device. In the invention, magnets of different magnetic force are preferably chosen, the magnet of smaller magnetic force being arranged to form the outer face, or front face of the magnet device. The difference between the magnetic forces of the magnets is preferably chosen to be less than 10 g / cm ² .

The magnetic sheets according to the invention have a thickness which is correlated with their magnetic force. The thicker the sheet, the greater the pitch between two parallel magnetic lines, and the greater the magnetic force generated. For example, the magnetic force can be measured by the load-bearing method.

In the invention, for example, the following magnet association was realized: the first magnet 10 is in the form of a magnet sheet 4/10 mm thick, with a pitch 112 between its magnetic lines 110 of 1 mm, and attached to the second magnet 11 which is in the form of a magnet sheet 5/10 mm thick, with a pitch 113 between its magnetic lines 111 of 2 mm.

In a first configuration of this magnetization device, the resultant of which is represented Figure 10a the lines of the two magnets are arranged so that they are perpendicular to each other in order to obtain a "braided" pattern. In a second configuration of this magnetization device, the resultant of which is represented Figure 10b , the respective lines of the two magnets are at 45 ° from each other to obtain a "wave" pattern. In the "braided" pattern the undulations are more frequent, when observed along an identical distance D of the resulting field pattern generated by the magnetizer, and larger amplitudes A than those obtained in the pattern. "Waves".

As a function of the distance D1 between the two magnets parallel to each other, the pattern of field lines generated by the magnetization device is more or less vague. Indeed, the larger D1 is, and the less the pattern of field lines observed on one side of the magnetizer will account for the interference produced by the farthest magnet on the other side. To get the most net possible, related to the interference between the two magnets, we choose preferably the distance D1 so that it is less than 5/10 mm and preferably less than 3/10 mm. In some embodiments, the distance D1 may be zero. In the first embodiment described, and corresponding to Figures 3a and 3b the distance D1 corresponds to the thickness of the first double-sided adhesive film 100.

Only the elements of the alternative embodiments described below, differing from the elements of the embodiments described above, will be described. Similar references, plus a prime sign, have been assigned to elements of the alternative embodiments similar to the elements of the embodiment described above.

In the example shown Figure 4 , corresponding to a first embodiment, the first magnet 10 'is integral with the wall 12'. He is, for example, stuck against her. The first magnet 10 'and the wall 12' are traversed by a pivot 19 secured to the second magnet 11 '. This pivot 19 is free to rotate through a first orifice 20 formed in the first magnet 10 ', and free to rotate relative to a second orifice 21 of the wall 12'. This second orifice 21 does not necessarily open on both sides of the wall 12 '. In the example shown Figure 4 , the second orifice 21 opens on both sides of the wall 12 '.

The pivot 19 is for example erected on a plate 22 carrying the second magnet 11, in order to make this plate 22, and therefore the second magnet rotatable relative to the first magnet 10 '. The second magnet 11 'is for example glued on the plate 22. According to this first embodiment, it is the second magnet which constitutes the front face of the magnetization device.

Alternatively, the pivot 19 can cooperate directly with the wall 12 ', without passing through the first magnet, it is then erected at the periphery of the first magnet 10'.

In the case where the magnets are mounted movable relative to each other as is the case in the embodiments shown in FIGS. Figures 4 , 7 , 8 and 9 the respective positions of the second magnet 11 'relative to the first magnet 10' can be indexed. For this purpose, the pivot 19 may comprise reliefs adapted to cooperate with a finite number of complementary reliefs, for example made in the wall 12 ', in order to index a finite number of relative positions. To facilitate the movement of the second magnet 11 ', the plate 22 may be provided with a wheel 23 facilitating handling. This wheel 23 may comprise a stop for cooperating with a phalanx of a finger when the substrate to be decorated is a fingernail.

In an illustrative variant embodiment, figure 7 , unlike the Figure 4 there is no pivot 19. The rotation of the plate 22 is allowed inside a circular periphery housing formed in the wall 12 ', at the rear of the first magnet 10'. In this case, the plate 22 is also circular around. The plate 22 can be retained by snapping into the housing, but free to rotate. In this case, it is the plate 22 which carries reliefs to cooperate with a finite number of complementary reliefs formed in the periphery of said housing of the wall 12 ', in order to index a finite number of relative positions of the magnets.

In addition, as shown Figure 7 , the wall 12 'may be covered on its front face with pictograms such as 24 which will be located near the wheel 23 for certain positions of the second magnet 11' relative to the first magnet 10 '.

In the case where the two magnets respectively have lines of fields parallel to each other, then the rotation of the magnet relative to that which is fixed is designed such that the angular displacement of the second magnet 11 'relative to the first is limited to an angle 25 of the order of 90 °.

In a second particular embodiment described, figure 8 , the wall 12 'has a curved face to adapt to the convex profile of the upper surface of a fingernail forming substrate to decorate. At least the second magnet 11 ', movable relative to this wall 12' is made in a flexible sheet to allow its rotation or translation relative to this wall, while the conforming to the shape of this wall, whatever the position taken. In this case, the second magnet 11 'is mounted on a plate 22 which is itself flexible in order to allow said conformation.

In embodiments where only the second magnet 11 'is movable relative to the wall 12', it may be chosen to make the second magnet in a flexible sheet, while the first magnet is made conventionally, for example with a magnet permanent. Permanent magnets can be replaced by at least one electromagnet.

Alternatively, according to another illustrative embodiment of a magnetization device, shown Figure 9 , the first magnet 10 ', fixed relative to the wall 12', is the one which is the outermost of the magnetization device, and therefore the magnet which will be brought closest to the substrate to be decorated. In this embodiment, the plate 22 carrying the second magnet 11 'is slidably mounted between the wall 12' and the first magnet 10 '. In this embodiment, relative positions of the second magnet 11 'relative to the first magnet 10' can be provided such that the two magnets do not overlap completely. The plate 22 preferably comprises two opposite lateral reinforcements 26 and 27 to promote the indexing of at least two extreme relative positions of the second magnet 11 'relative to the first.

In a preferred mode of use of any alternative embodiment of the invention of a magnetization device, the substrate covered with a film of fluid composition having magnetic bodies near the device is approached. The faster the composition tends to freeze, ie less than 1 minute after removal of the film, the shorter it will be necessary to shorten the time between the removal of said film and its exposure to the magnetic field. When the composition freezes in less than 1 minute, a relative position of the second magnet relative to the first is first chosen.

The effectiveness of the magnetization device is a function of a distance D2 defined between the substrate covered with its film and the magnet which can be presented closer to the substrate. In particular, the spatial configuration of the second portion 15 and the positioning stop 18 are chosen such that this distance D2 is preferably between 0.3 and 3 mm, in particular of the order of 1 mm.

The magnetic power of a magnet is less than 2000 Gauss when the magnet is made in a flexible sheet. In particular, its magnetic power is of the order of 1300 G.

The higher the viscosity of the composition spread on the film on the substrate, the more magnetic bodies included in the film will be subjected to resistance preventing them from being placed along the lines of the magnetic field to which they will be subjected. Thus, the higher the viscosity of the composition, the more important it is to place the film near the magnetizer, and thus to choose a position in which the film is at a distance D2 close to its lower limit. When the viscosity at 25 ° C of the composition is greater than 0.6 Pa.s, the magnetizer is designed such that the distance D2 is non-zero and less than 1 mm.

Viscosity measurement

The viscosity of the composition is measured at 25 ° C. using a Rhéomat 180 (Company LAMY) equipped with a mobile MS-R1, MS-R2, MS-R3, MS-R4 or MS-R5 chosen from depending on the consistency of the composition, rotating at a speed of rotation of 200 t.min-1. The measurement is taken after 10 minutes of rotation. The viscosity measurements are carried out at most 1 week after manufacture of the composition.

Throughout the description, the phrase "having one" should be considered synonymous with "having at least one", unless the opposite is specified.

Claims (16)

1. Assembly comprising a container (1) that contains a fluid composition comprising magnetic substances and a magnetization device (8) that makes it possible to produce a pattern on a substrate (7) onto which said composition has been deposited, this magnetization device comprising a holder (12) and two magnets (10, 11), at least one of which is in the form of a flexible sheet, the two magnets being at least partially superposed so that the field lines that they generate in combination with one another result from the interference between the field lines of each of the magnets, characterized in that the magnetization device comprises a concave front face.
2. Assembly according to Claim 1, characterized in that the magnet in the form of a flexible sheet forms a front face of the magnetization device intended to be placed closest to the substrate.
3. Assembly according to Claim 1 or 2, characterized in that the magnet of lower magnetic power among the two magnets is positioned so as to form a front face of the magnetization device intended to be placed closest to the substrate.
4. Assembly according to any one of the preceding claims, characterized in that the concave front face comprises at least one peak where the radius of curvature is between 4 and 20 mm.
5. Assembly according to any one of the preceding claims, characterized in that the two magnets are arranged so as to allow modifications of the field lines that they generate in combination with one another, one of the two magnets being movable relative to the other of the magnets.
6. Assembly according to Claim 5, characterized in that a first magnet (10) is held at a fixed position relative to the holder.
7. Assembly according to Claim 5 or 6, characterized in that a second magnet (11) is movably mounted about an axis of rotation (19) relative to the holder.
8. Assembly according to any one of the preceding claims, characterized in that the holder comprises a fastening means (14) in order to be retained on the container comprising the composition.
9. Assembly according to any one of the preceding claims, characterized in that the container is a bottle equipped with a neck and the holder comprises an opening (14) in order to fit around the neck.
10. Assembly according to any one of the preceding claims, characterized in that one of the magnets is multipolar.
11. Assembly according to any one of the preceding claims, characterized in that the two magnets are in flexible sheet form and are multipolar.
12. Assembly according to any one of the preceding claims, characterized in that the magnet in the form of a flexible sheet is formed by the inclusion of magnetized particles in a sheet made from a thermoplastic or from a resin.
13. Assembly according to either one of Claims 10 and 11, characterized in that the magnetized particles are arranged so as to form lines in the holder.
14. Assembly according to any one of the preceding claims, characterized in that the assembly comprises an applicator (2) mounted so as to be firmly attached to a closure member (4) of the container, this closure member possibly cooperating with the magnetization device in order to keep it firmly attached to the container.
15. Method for decorating a substrate using an assembly according to any one of the preceding claims, characterized in that it comprises the following steps:

    - a film of fluid composition is deposited on the substrate (7), the substrate being a keratin material, for example a nail, the skin or a mucosa, such as a lip, or a part intended to form packaging, for example primary or secondary packaging of said assembly; and

    - the film deposited is subjected to the magnetic field generated by the magnetization device before solidification of the film.
16. Method according to the preceding claim, characterized in that the magnet in the form of a flexible sheet was previously embossed before its incorporation into the magnetization device so as to have a concave front face.

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