Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
  • A61Q1/02—Preparations containing skin colorants, e.g. pigments
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/0241—Containing particulates characterized by their shape and/or structure
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
  • A61K8/25—Silicon; Compounds thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • A61K8/8105—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • A61K8/8111—Homopolymers or copolymers of aliphatic olefines, e.g. polyethylene, polyisobutene; Compositions of derivatives of such polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • A61K8/8105—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • A61K8/8117—Homopolymers or copolymers of aromatic olefines, e.g. polystyrene; Compositions of derivatives of such polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • A61K8/8152—Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • A61K8/8158—Homopolymers or copolymers of amides or imides, e.g. (meth) acrylamide; Compositions of derivatives of such polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/86—Polyethers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/88—Polyamides
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/89—Polysiloxanes
  • A61K8/895—Polysiloxanes containing silicon bound to unsaturated aliphatic groups, e.g. vinyl dimethicone
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B82—NANOTECHNOLOGY
  • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
  • B82Y5/00—Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/41—Particular ingredients further characterized by their size
  • A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/42—Colour properties
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/42—Colour properties
  • A61K2800/43—Pigments; Dyes
  • A61K2800/436—Interference pigments, e.g. Iridescent, Pearlescent

Definitions

• the present invention relates to cosmetic compositions and more particularly, but not exclusively, those intended for the makeup of keratin materials, in particular the skin, the lips, the nails, the eyelashes and the hair.
• the use of such pigments and dyes can however raise difficulties.
• the pigments and dyes may have relatively low UV resistance and become light-impaired.
• the color produced may not be as bright and bright as desired.
• Pigments and dyes can still impose formulation constraints.
• the publication WO 02/056854 of the applicant company discloses an iridescent composition for topical application, comprising at least one water-soluble surfactant and monodisperse particles in aqueous dispersion, these particles having a number-average size ranging from 50 to 300 nm and the amount of these particles being at least 3% by weight relative to the total weight of the composition.
• the application WO 05/018566 discloses a topical system for application to the skin, comprising a colloidal crystalline lattice in a hydrophilic phase and at least one phase containing an oil.
• compositions for producing color through at least one ordered array of monodisperse particles such a grating being sometimes referred to as "photonic crystal”.
• a cosmetic composition according to the invention may comprise:
• a physiologically acceptable medium at least 15% by weight, better still 20% by weight, relative to the total weight of the composition, of monodisperse particles having an average size of preferably between 80 nm and 500 nm, better still between 150 nm and 450 nm, able to form an ordered network of monodisperse particles on a support on which the composition is applied.
• Such a content of monodisperse particles combined with the above selection in size, facilitates the formation of a compact ordered array of monodisperse particles having interesting optical properties, including a reflection of light in the visible or near-visible range. .
• the relatively high concentration of particles can facilitate the formation of a crystal lattice, for example using a cosmetic applicator.
• a relatively high concentration can indeed lead to a pre-organization of the particles by electrostatic repulsion in the composition and / or during the drying thereof.
• the particles can form a compact crystal lattice after application.
• the network may possibly be discontinuous with the presence of fractures and dislocations.
• the diffracted wavelength is therefore mainly dependent on the angle of observation and the distance between the particles. When the formed network is compact, this distance depends mainly on the size of the particles. It is therefore possible to obtain different goniochromatic stains by varying the size of the particles present.
• UV protection UV protection
• IR range antichemical coating
• the invention may also make it possible to form a colored deposit after application of an initially colorless composition.
• the invention can make it possible to produce, if desired, a cosmetic composition free of dye or pigment, the color being produced by the ordered network of monodisperse particles.
• the invention may also make it possible to produce a colored deposit sensitive to an external stimulus such as, for example, temperature, humidity or ultraviolet radiation.
• an external stimulus such as, for example, temperature, humidity or ultraviolet radiation.
• Such a stimulus can influence the distance between the particles of the network and thus change the color, as explained above.
• the distance between the particles can be modified, for example due to a variation of the particle size under the effect of the external stimulus and / or a variation of the distance between the particles with a substantially constant size, for example due to a variation of the repulsive forces therebetween and / or a variation in the size of at least one compound present between the particles.
• the refractive index of the medium may possibly vary under the effect of the external stimulus, for example the temperature.
• the invention can make it possible to obtain a durable and luminous coloration over a large surface.
• composition comprising: monodisperse particles,
• composition comprising:
• this medium having a relative dielectric constant of greater than or equal to 10, better still greater than or equal to 20, more preferably greater than or equal to 30.
• the subject of the invention is also a composition comprising: monodisperse particles,
• composition comprising:
• microdisperse particles denotes, according to the invention, particles whose average size has a coefficient of variation CV of less than or equal to 15%.
• the average size D and the standard deviation s can be measured on 250 particles by analysis of an image obtained by means of a scanning electron microscope, for example that of reference S-4500 from HITACHI.
• An image analysis software can be used to facilitate this measurement, for example the Winroof ® software, marketed by Mitani Corporation.
• the coefficient of variation of the monodisperse particles is less than or equal to 10%, better still less than or equal to 7%, and even better still less than or equal to 5%, being for example substantially of the order of 3.5%.
• a small dispersion of the particle size may be favorable to the quality of the compact crystal lattice formed and thus to obtaining bright and bright colors.
• the average size D of the monodisperse particles may be generally between 80 and 500 nm, better still between 100 and 500 nm or 150 and 450 nm, which may be chosen as a function, for example, of the color or colors to be obtained and of the surrounding medium.
• a preferential range of average size is from 150 to 450 nm, more preferably from 190 to
• the average size can range from 80 to 200 nm for UV filtration.
• the mass content of monodisperse particles can range, for example, from 15 to 70%, being for example greater than 20%, 25%, 30%, 35%, 40% or 45%.
• a different content, for example from 1 to 70% may be allowed according to some other aspects of the invention.
• the mass content in this aqueous phase may be greater than 15%, or even 20%, relative to the weight of the aqueous phase.
• the periodic network formed may be monolayer or multilayer, compact or not.
• the shape of the monodisperse particles must be compatible with the formation of an ordered network of monodisperse particles.
• the formed network may be at least partially cubic centered, cubic face-centered or hexagonal compact or hybrid, formed from these arrangements, or other.
• Various examples of formation of a crystal lattice from monodisperse particles are given in Xia et al., Adv. Mater., 12, 693-713 (2000).
• the shape of the monodisperse particles is spherical, but other forms, including axial symmetry, are possible.
• the monodisperse particles can be monomaterial or composite.
• the monodisperse particles may be solid or hollow. Hollow monodisperse particles have a lower density than solid particles and thus allow to occupy more volume for the same mass concentration.
• the monodisperse particles consist of a material of high density, for example an inorganic material
• the hollow particles make it possible to limit the phenomena of sedimentation in the composition.
• the presence of air or another gas inside the particles after drying makes it possible to obtain a large difference in refractive index between the particles and the surrounding medium, which is favorable in terms of peak intensity. diffraction and therefore the development of a very intense coloring.
• Many non-volatile compounds can be added to the composition or the composition without losing the color and ending up with a transparent composition.
• the monodisperse particles may be porous or non-porous. The presence of small pores within the particles can decrease the refractive index of these particles.
• the refractive index n p of the monodisperse particles is different from that n c of the continuous medium extending around the particles after application of the formulation and the difference of these refractive indices is preferably greater than or equal to 0.02, better greater than or equal to 0.05, more preferably greater than or equal to 0.1, being for example between 0.02 and 2, in particular between 0.05 and 1.
• a difference in refractive index n p- n c too low may require a large number of layers of particles of the ordered network to obtain the desired result.
• a too important index difference can accentuate the phenomena of light diffusion by the layer and bring about a bleaching of the deposit after application.
• the refractive index of the monodisperse particles is defined as the average refractive index. In the case of composite particles, it is calculated linearly as a function of the volume proportion of each component.
• the refractive index of the monodisperse particles may be greater than or equal to that of the medium, for example being greater than or equal to 1.4, especially between 1.4 and 1.7.
• All monodisperse particles corresponding to the same average size D may have substantially the same refractive index.
• the monodisperse particles may be colored, that is to say non-white, for example to enhance the intensity of the color produced and / or to avoid a whitening phenomenon of the composition after application to the keratin materials.
• the color of the monodisperse particles may be provided by the choice of the material or materials constituting each ⁇ onodisperse particle. It can have the effect of increasing the absorption of light by the particles and decrease the diffusion.
• the monodisperse particles may in particular incorporate at least one pigment or dye, organic or inorganic, the latter may optionally be fluorescent and have a fluorescence in the ultraviolet or infrared.
• the monodisperse particles may comprise an inorganic compound, or even be entirely mineral.
• the monodisperse particles when they are inorganic, they may for example comprise at least one oxide, in particular a metal, chosen for example from oxides of silica, iron, titanium, aluminum, chromium, zinc, copper, of zirconium and cerium and mixtures thereof.
• the monodisperse particles may also include a metal, including titanium, silver, gold, aluminum, zinc, iron, copper, and mixtures and alloys thereof.
• the monodisperse particles may comprise an organic compound, or even be entirely organic.
• polymers in particular with a carbon or silicone chain, for example polystyrene (PS), polymethylmethacrylate (PMMA), polyacrylamide (PAM), polymers of silicone.
• PS polystyrene
• PMMA polymethylmethacrylate
• PAM polyacrylamide
• the monodisperse particles may comprise at least one polymer or copolymer capable of ionizing in order to improve the dispersibility in the medium and the electrostatic stabilization.
• this polymer or copolymer preferably contains carboxylic acid or sulfonic functions.
• the monodisperse particles may for example comprise a core and a bark made of different materials, for example organic and / or mineral materials.
• the material of the core or bark may be chosen for example in order to improve the stability in the environment of the monodisperse particles, to increase their refractive index and / or to color these. and / or to impart to them fluorescence or magnetic susceptibility.
• the core may consist of an insoluble material in the medium containing the particles, for example an inorganic material, such as silica for example, or an organic material, such as an acrylic polymer, for example.
• the bark may consist of polymer chains, which may be soluble in the medium containing the particles, the polymer chains may comprise polymers grafted to the surface of the core of the monodisperse particles, which may be insoluble in the medium.
• Such core particles and polymeric chains also called “hairy” particles, can be stabilized in the medium not only by electrostatic interactions but also by steric interactions of excluded volume type.
• the additional stabilization and volume provided by the polymer chains makes it easy to incorporate other components into the composition without the risk of destabilization and aggregation of the particles.
• these other components are, for example, coloring agents or fillers intended, for example, to modify the appearance of the composition or of the support coated therewith.
• the polymer chains may comprise graft polymer chains, which may contain chemical functions (carboxylic acid, amine, amide, thiol, etc.) capable of interacting with the keratin materials and of improving the adhesion of the composition to the covered support.
• Polymeric chains can also improve the resistance of the particle network after application to keratin materials. Examples of "hairy" particles are given for example in the publication Ishizu et al., Kagalcu To Kogyo, 57 (7) (2004) in the case of a polymer core or in the publication Okubo et al., Colloid & Polymer Science, 280 (3), pp290-
• the presence of a bark may make it possible to encapsulate therein a compound for which direct contact with the keratin materials or the medium is undesirable.
• Composite monodisperse particles may further comprise inclusions of a first material in a matrix of a second material.
• the first material may have a high refractive index to increase the overall refractive index of the particle.
• the particle may for example comprise inclusions of nanoparticles, for example nanoparticles of titanium oxide.
• the monodisperse particles may be manufactured according to synthetic methods as described, for example, in the publication Xia et al, Adv. Mater., 12, 693-713 (2000), incorporated by reference.
• Commercial references for monodisperse particles that may be suitable include Seahoster ® KE-W10 (silica), Seahoster ® KE-W20 (silica), Seahoster ® KE-W25 (silica), Seahoster ® KE-W30 (silica), Seahoster ® KE-P20 (silica), Seahoster ® KE-P30 (silica) from Nippon Shokubai, Optibind ® (polystyrene) 216 or 290 nm microparticles from Seradyn company, Cosmo ® 30 (silica) of the CCIC, Hipresica ® FQ (silica) in Ube-Nitto company Eposter ® MX-100W (PMMA) and Eposter ® MX-200W (PMMA) from
• the monodisperse particles may, where appropriate, have a size which is sensitive to an external stimulus, for example the concentration of a compound and / or the temperature and / or the pressure.
• the monodisperse particles are, for example, particles of a polymer which are swollen in a solvent, these particles forming a microgel.
• the publication HU et al, Angevandte Chemie 42, 4799-4802 (2003) discloses particles based on poly-N-isopropylacrylamide and a method for obtaining colloidal crystals with these particles. Such particles swell more or less depending on the temperature and thus make it possible to obtain a color sensitive to temperature.
• the polymers based on poly-N-isopropylacrylamide may also be present in a bark of monodisperse particles . composites, in particular "hairy" particles. Medium containing monodisperse particles
• the monodisperse particles can be contained at least before application in a physiologically acceptable medium for forming on the support on which the composition is applied an ordered network of monodisperse particles.
• physiologically acceptable medium synonymous with the expression
• Cosmetically acceptable medium means a non-toxic medium that can be applied to keratin materials of human beings, in particular the skin, mucous membranes or superficial body growths.
• the physiologically acceptable medium is generally adapted to the nature of the support on which the composition is to be applied and to the form in which the composition is intended to be packaged.
• the monodisperse particles may be contained in a liquid phase.
• the medium containing the monodisperse particles may be entirely liquid or may contain other particles, as appropriate.
• the medium may be chosen so as to promote the dispersion of the particles in the medium before the application thereof, in order to avoid aggregation of the particles.
• the medium may be chosen such that the ordered network of monodisperse particles is formed by regular stacking thereof, after application to the keratin materials, the network not existing in the composition before application and forming for example during the evaporation of a solvent contained in the composition.
• the refractive index of the medium advantageously has, as indicated previously, a difference with that of the monodisperse particles, this difference being in absolute value preferably greater than or equal to 0.02, better still greater than or equal to 0.05, in particular between 0.05 and 1, more preferably greater than or equal to 0.1.
• the medium may be aqueous, the monodisperse particles may be contained in an aqueous phase.
• aqueous medium is meant a liquid medium at room temperature and atmospheric pressure which contains a significant fraction of water based on the total weight of the medium.
• the additional fraction may contain or consist of physiologically acceptable organic solvents miscible with water, for example alcohols or alkylene glycols.
• the mass content of water of the aqueous medium is preferably greater than or equal to 30%, better still 40%, even more preferably 50%.
• the medium may be monophasic or multiphasic and may or may not include solids other than monodisperse particles, especially smaller particles or larger particles.
• the amount of these bodies will be small enough not to interfere with the formation of the ordered network of monodisperse particles and obtaining the desired result in terms of coloring in particular.
• the medium may comprise at least one compound having an OH bond, especially an alcohol function, in a mass content for example greater than or equal to 5%, more preferably 10%.
• a compound having an OH bond especially an alcohol function
• a mass content for example greater than or equal to 5%, more preferably 10%.
• the medium may comprise an alcohol, such as pethanol or isopropanol, for example, or a glycol derivative, especially ethylene glycol or propylene glycol.
• an alcohol such as pethanol or isopropanol
• a glycol derivative especially ethylene glycol or propylene glycol.
• the medium has a relative dielectric constant ⁇ greater than or equal to 10, more preferably 20, more preferably 30.
• the dielectric constant is measured at a temperature of 25 ° C.
• a relatively high dielectric constant favors the scheduling of networked monodisperse particles.
• the conductivity of the composition may be between 5 and 2,000 ⁇ S.cm -1 , in particular between 10 and 4,000 ⁇ S cm -1 , or even between 20 and 400 ⁇ S cm -1 .
• the medium can be transparent or translucent, and colored or not.
• the medium containing the monodisperse particles may contain no pigment or dye.
• the coloration of the medium may correspond to the addition of an additional coloring agent.
• the color of the medium corresponds for example to one of the colors likely to be generated by the ordered network of monodisperse particles, for example the color produced by the network when observed at normal incidence.
• the color of the medium can also be black in order to limit the diffusion of light.
• the ordered network of monodisperse particles can make it possible to easily obtain the colors green, red or blue.
• the colonel domain can be extended by the presence of an additional coloring agent, for example a dye, an absorbing pigment or an effect pigment, for example at a concentration ranging from 0.1 to 15% by weight.
• effect pigment is meant, inter alia, reflective particles, nacres, goniochromatic coloring agents or diffractive pigments, as defined below.
• pigments of a relatively large size such as nacres for example, may not prevent the formation of the network next to the pigment particles, but on the contrary promote its formation by improving the confinement of the monodisperse particles, the large particles which can be introduced in certain dislocations of the network.
• the medium may thus comprise larger particles having a size at least 3, better 5 times that of the monodisperse particles, more preferably 10 times higher. These large particles may be particles of a pigment or a non-coloring filler. The medium may thus comprise at least one effect pigment.
• the presence of monodisperse particles makes it possible to produce a periodic network after application to the keratin materials.
• This network makes it possible to obtain a color effect by diffraction of light and the Applicant has found that it is possible to associate a second optical effect with an effect pigment while maintaining the periodic grating.
• the two optical effects will be additional and the presence of the pigment thus makes it possible to extend the color range and the optical effects obtained by the network formed on the keratin materials.
• the effect pigment may be present in the formulation at a concentration of between 0.1 and 70%, preferably 1 to 50%, preferably 5 to 20%. Reflective particles
• Reflective particles can be used to create highlight points visible to the naked eye.
• Reflective particles can have various shapes. These particles may in particular be in the form of platelets or globular, in particular spherical. These particles may comprise a substrate covered with a reflective material.
• the substrate may be chosen from glasses, metal oxides, aluminas, silicas, silicates, especially aluminosilicates and borosilicates, mica, synthetic mica, synthetic polymers and mixtures thereof.
• the reflective material may include a layer of metal or a metal compound.
• Platelet-coated silver-coated glass substrate particles are sold under the name METASHINE by Nippon Sheet Glass.
• reflective particles mention may also be made, for example, of particles comprising a synthetic mica substrate coated with titanium dioxide, or particles of coated glass of brown iron oxide, of titanium oxide, of tin oxide or a mixture thereof such as those sold under the trade name REFLECKS® by ENGELHARD.
• the pigments of the METASHINE range are also suitable for the invention.
• These pigments are C-GLASS glass flakes comprising 65 to 72% SiO 2 , covered with a layer of rutile titanium oxide (TiO 2 ) . These glass flakes have an average thickness of 1 micron and an average size of 80 microns, a ratio in average size / average thickness of 80. They have blue, green, yellow or silver-tone reflections depending on the thickness of the glass. TiO 2 layer.
• 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 reflective particles 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 reflective particles may be particles derived from a multilayer polymeric film. Such particles are described in particular in WO 99/36477, US Pat. No. 6,299,979 and US Pat. No. 6,387,498.
• Reflective particles comprising a stack of at least two polymer layers are marketed by the company 3M under the name MIRROR GLITTER. These particles comprise 2,6-PEN and polymethyl methacrylate layers in a weight ratio of 80/20. Such particles are described in US Patent 5,825,643.
• nacres it is necessary to include colored particles of any shape, iridescent or not, in particular produced by certain shellfish in their shell or else synthesized and which exhibit a color effect by optical interference.
• the nacres may be chosen from pearlescent pigments such as iron oxide coated titanium mica, bismuth oxychloride-coated mica, chromium oxide-coated titanium mica, dyed-coated titanium mica. organic especially of the aforementioned type as well as 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.
• the goniochromatic coloring agents in the sense of the present invention have a color change, also called “color flop”, depending on the angle of observation, greater than that which can be encountered with nacres.
• the goniochromatic coloring agent may be chosen, for example, from interferential multilayer structures and liquid crystal coloring agents.
• examples of symmetrical interferential multilayer pigments that can be used in compositions produced in accordance with the invention are, for example:
• goniochromatic coloring agents having a multilayer structure comprising an alternation of polymeric layers, for example of the polyethylene naphthalate and polyethylene terephthalate type.
• Such agents are described in particular in WO-A-96/19347 and WO-A-99/36478.
• Mention may be made, by way of example of pigments with a polymeric multilayer structure, those marketed by 3M under the name COLOR GLITTER or those marketed by Venture Chemical under the name Micro Glitter Pearl.
• the liquid crystal coloring agents comprise, for example, silicones or cellulose ethers onto which mesomorphic groups are grafted.
• liquid crystal goniochromatic particles it is possible to use, for example, those sold by the company Chenix as well as those sold under the name Helicone® HC by the company SICPA.
• the composition may further comprise dispersed goniochromatic fibers.
• Such fibers may, for example, have a size of between 50 ⁇ m and 2 mm.
• Goniochromatic fibers with a polyethylene terephthalate / nylon-6 bilayer structure are sold by the company TEIJIN under the name
• a diffractive pigment is understood to mean a pigment comprising a periodic pattern constituting a diffraction grating. Since the distance between the periodic patterns is of the same order of magnitude as the visible light, this pigment will be able to diffract the light and produce, for example, a rainbow effect.
• Such pigments are commercially available under the name SPECTRAFLAIR from JDS Uniphase Corporation.
• Such pigments can also be made according to the methods taught by the patents US6818051, US6894086 and EP 1634619. These patents describe pigments consisting of a 3-dimensional network of silica particles similar to the opal structure. Inverse opal structures can also be obtained and used.
• the medium in which the ordered network of monodisperse particles is formed can evaporate or not after application of the composition.
• the medium may comprise a volatile solvent.
• volatile solvent means any liquid capable of evaporating on contact with the skin at ambient temperature and under atmospheric pressure.
• the medium can in particular be chosen so that the composition contains at least 10%, or even at least 30% of volatile solvent.
• the pH of the composition may range from 1 to 11, for example from 3 to 9.
• the pH most suitable for the formation of the network may depend on the nature of the monodisperse particles.
• a basic pH is preferred when the monodisperse particles are inorganic, especially comprising silica.
• the medium may comprise smaller particles having an average size D less than that of the monodisperse particles by a factor of at least 2, better still at least 3, in order to allow their insertion into the voids left between the monodisperse particles.
• These interstitial particles can be inorganic or organic and can improve the cohesion of the network or change the absorption of light by the layers of the network.
• interstitial particles As an example of interstitial particles, mention may be made of nanoparticles of titanium dioxide, silica, iron oxide, carbon black, of average size ranging from 5 to 150 nm, for example from 10 to 100 nm.
• interstitial particles there may be mentioned particles of a polymer, which is for example in the already polymerized state in the composition before its application to keratin materials, the medium comprising, for example, a latex.
• the size of the interstitial particles may, where appropriate, vary depending on an external stimulus and / or the concentration of a compound in the medium.
• the Interstitial particles may be water-absorbing. The size of the particles may then for example vary according to the concentration of water in the medium.
• the variation in size of the interstitial particles may, if necessary, exert an action on the distance between the monodisperse particles and thus have an action on the color produced by the network.
• the medium may comprise at least one polymer to improve the behavior of the network after its formation.
• This polymer is for example in the not completely polymerized and / or crosslinked state in the composition before the application thereof and its drying.
• the medium contains a polymer which is not completely polymerized and / or crosslinked before the application of the composition to the keratin materials, the crosslinking and / or polymerization may take place after the application of the composition to the keratin materials.
• the polymerization and / or crosslinking may occur for example after formation of the monodisperse particle network or alternatively before and / or concomitantly with the latter.
• the medium may comprise a film-forming polymer.
• the term "film-forming polymer” is intended to mean a polymer capable of forming, by itself or in the presence of an auxiliary film-forming agent, a film which is macroscopically continuous and adheres to the keratin materials, and preferably a cohesive film. and more preferably a film whose cohesion and mechanical properties are such that said film can be isolable and manipulable in isolation, for example when said film is produced by casting on a non-stick surface such as a Teflon or silicone surface.
• the composition may comprise an aqueous phase and the film-forming polymer may be present in this aqueous phase.
• the film-forming polymer may be present in this aqueous phase.
• it will preferably be a dispersion polymer or an amphiphilic or associative polymer.
• aqueous dispersion polymers can be used: Ganz Chemical's Ultrasol 2075, Daito Kasei's Daitosol 5000AD, Noveon's Avalon UR 450, National Starch's DYNAMX, Interpolymer's Syntran 5760, Rohm & Haas Acusol OP 301, Neocryl A 1090's from Avecia.
• Neocryl XK-90® The acrylic dispersions sold under the names Neocryl XK-90®, Neocryl A-1070®, Neocryl A-1090®, Neocryl BT-62®, Neocryl A-1079® and Neocryl A-523® by the company Avecia-Neoresins, Dow Latex 432® by DOW CHEMICAL, Daitosol 5000 AD® or Daitosol 5000 SJ® by DAITO KASEI KOGYO; Syntran 5760® by the company Interpolymer, Allianz OPT by the company Rohm & Haas, aqueous dispersions of acrylic or styrene / acrylic polymers sold under the trade name JONCRYL® by the company JOHNSON POLYMER or the aqueous polyurethane dispersions sold under the denominations Neorez R-981® and Neorez R-974® by the company AVECIA-NEORESINS, Avalure UR-405®, Avalure UR-410
• amphiphilic or associative polymers polymers having one to several hydrophilic moieties which render them partially soluble in water and one or more hydrophobic moieties through which the polymers associate or interact.
• the following associative polymers may be used: Nuvis FX1100 from Elementis, Aculyn 22, Aculyn 44, Aculyn 46 from Rohm & Haas, Viscophobe DB 1000 from Amerchol.
• the diblock copolymers consisting of a hydrophilic block (polyacrylate, polyethylene glycol) and a hydrophobic block (polystyrene, polysiloxane, can also be used.
• Soluble polymers in an aqueous phase containing the monodisperse particles can be avoided because they can cause an aggregation of the monodisperse particles.
• the film-forming polymer may thus be insoluble in such a phase.
• the composition may comprise an oily phase and the film-forming polymer may be present in this oily phase.
• the polymer may then be in dispersion or in solution.
• NAD (non-aqueous dispersion) or microgel (for example KSG) polymers may be used, as well as PS-PA polymers or styrene-based copolymers (Kraton, Regalite).
• non-aqueous dispersions of lipid-dispersible film-forming polymer in the form of non-aqueous dispersions of polymer particles in one or more silicone and / or hydrocarbon oils and which can be stabilized at their surface by at least one stabilizing agent, in particular a block polymer, grafted or statistical
• acrylic dispersions in isododecane such as Mexomère PAP® from Chimex
• particle dispersions of a grafted ethylenic polymer preferably acrylic polymer, in a liquid fatty phase, the ethylenic polymer advantageously being dispersed in the absence of additional stabilizer at the surface of the particles as described in particular in WO 04/055081.
• polymeric polymers that may be used in the composition of the present invention, mention may be made of synthetic polymers, of radical type or of polycondensate type, polymers of natural origin, and mixtures thereof.
• radical-forming film-forming polymer is meant a polymer obtained by polymerization of unsaturated monomers, especially ethylenic monomers, each monomer being capable of homopolymerizing (unlike polycondensates).
• the radical-type film-forming polymers may in particular be polymers, or copolymers, vinylic polymers, in particular acrylic polymers.
• the vinyl film-forming polymers may result from the polymerization of ethylenically unsaturated monomers having at least one acidic group and / or esters of these acidic monomers and / or amides of these acidic monomers.
• ⁇ , ⁇ -ethylenic unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid. It is preferable to use (meth) acrylic acid and crotonic acid, and more preferably (meth) acrylic acid.
• the acidic monomer esters are advantageously chosen from esters of (meth) acrylic acid (also called (meth) acrylates), in particular alkyl (meth) acrylates, in particular C 1 -C 30 alkyl, preferably C 1 -C 20, (meth) acrylates of aryl, in particular of C 6 -C 10 aryl, hydroxyalkyl (meth) acrylates, in particular hydroxy C 2 -C 6 alkyl.
• alkyl (meth) acrylates mention may be made of methyl methacrylate, ethyl methacrylate, butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, cyclohexyl methacrylate.
• hydroxyalkyl (meth) acrylates mention may be made of hydroxyethyl acrylate, 2-hydroxypropyl acrylate, hydroxyethyl methacrylate and 2-hydroxypropyl methacrylate.
• aryl (meth) acrylates mention may be made of benzyl acrylate and phenyl acrylate.
• Particularly preferred (meth) acrylic acid esters are alkyl (meth) acrylates.
• the alkyl group of the esters can be either fluorinated or perfluorinated, ie some or all of the hydrogen atoms of the alkyl group are substituted by fluorine atoms.
• Amides of the acidic monomers include, for example, (meth) acrylamides, and especially N-alkyl (meth) acrylamides, in particular C 2 -C 12 alkyl.
• N-alkyl (meth) acrylamides mention may be made of N-ethyl acrylamide, N-t-butyl acrylamide, N-t-octyl acrylamide and N-undecylacrylamide.
• the vinyl film-forming polymers can also result from the homopolymerization or copolymerization of monomers chosen from vinyl esters and styrene monomers.
• these monomers can be polymerized with acidic monomers and / or their esters and / or their amides, such as those mentioned above.
• vinyl esters include vinyl acetate, vinyl neodecanoate, vinyl pivalate, vinyl benzoate and vinyl t-butyl benzoate.
• Styrene monomers include styrene and alpha-methyl styrene.
• film-forming polycondensates mention may be made of polyurethanes, polyesters, polyester amides, polyamides, and epoxy ester resins, polyureas.
• the polyurethanes may be chosen from anionic, cationic, nonionic or amphoteric polyurethanes, polyurethane-acrylics, poly-urethanes-polyvinylpyrrolidones, polyester-polyurethanes, polyether-polyurethanes, polyureas, polyurea-polyurethanes, and their polyurethanes. mixtures.
• the polyesters can be obtained, in known manner, by polycondensation of dicarboxylic acids with polyols, especially diols.
• the dicarboxylic acid can be aliphatic, alicyclic or aromatic.
• examples of such acids are: oxalic acid, malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, 2,2-acid.
• dicarboxylic acid monomers may be used alone or in combination with at least two dicarboxylic acid monomers. Among these monomers, phthalic acid, isophthalic acid and terephthalic acid are preferably chosen.
• the diol may be chosen from aliphatic, alicyclic and aromatic diols.
• the polyester amides can be obtained in a similar manner to the polyesters by polycondensation of diacids with diamines or amino alcohols.
• diamine there can be used ethylenediamine, hexamethylenediamine, meta- or para-phenylenediamine.
• aminoalcohol monoethanolamine can be used.
• the polyester may further comprise at least one monomer bearing at least one -SO3M group, with M representing a hydrogen atom, an NH4 + ammonium ion or a metal ion, for example an Na +, Li +, K +, Mg2 + or Ca2 + ion. , Cu2 +, Fe2 +, Fe3 +.
• M representing a hydrogen atom, an NH4 + ammonium ion or a metal ion, for example an Na +, Li +, K +, Mg2 + or Ca2 + ion. , Cu2 +, Fe2 +, Fe3 +.
• a bifunctional aromatic monomer comprising such a group -SO3M.
• the aromatic nucleus of the bifunctional aromatic monomer additionally carrying a group -SO3M as described above may be chosen for example from benzene, naphthalene, anthracene, diphenyl, oxydiphenyl, sulfonyldiphenyl and methylenediphenyl nuclei.
• An example of a bifunctional aromatic monomer also bearing an -SO 3 M group is sulphoisophthalic acid, sulphoterephthalic acid, sulphophthalic acid and 4-sulphonamethyl-2,7-dicarboxylic acid.
• the film-forming polymer may be a polymer solubilized in a liquid fatty phase comprising organic oils or solvents (it is said that the film-forming polymer is a liposoluble polymer).
• the liquid fatty phase comprises a volatile oil, optionally mixed with a non-volatile oil.
• a fat-soluble polymer mention may be made of vinyl ester copolymers (the vinyl group being directly connected to the oxygen atom of the ester group and the vinyl ester having a saturated hydrocarbon radical, linear or branched, from 1 to 19 carbon atoms, linked to the carbonyl ester group) and from at least one other monomer which may be a vinyl ester (different from the vinyl ester already present), an ⁇ -olefin (having from 8 to 28 carbon atoms), an alkyl vinyl ether (the alkyl group of which contains 2 to 18 carbon atoms), or an allyl or methallyl ester (having a linear or branched, saturated hydrocarbon radical of 1 to 19 carbon atoms, bonded to the carbonyl ester group).
• vinyl ester copolymers the vinyl group being directly connected to the oxygen atom of the ester group and the vinyl ester having a saturated hydrocarbon radical, linear or branched, from 1 to 19 carbon atoms, linked to the carbonyl ester group
• copolymers may be crosslinked using crosslinking agents which may be of the vinyl type, or of the allyl or methallyl type, such as tetraallyloxyethane, divinylbenzene, divinyl octanedioate, divinyl dodecanedioate, and octadecanedioate. divinyl.
• crosslinking agents which may be of the vinyl type, or of the allyl or methallyl type, such as tetraallyloxyethane, divinylbenzene, divinyl octanedioate, divinyl dodecanedioate, and octadecanedioate. divinyl.
• copolymers examples include copolymers: vinyl acetate / allyl stearate, vinyl acetate / vinyl laurate, vinyl acetate / vinyl stearate, vinyl acetate / octadecene, vinyl acetate / octadecylvinylether vinyl propionate / allyl laurate, vinyl propionate / vinyl laurate, vinyl stearate / octadecene-1, vinyl acetate / dodecene-1, vinyl stearate / ethyl vinyl ether, vinyl propionate / cetyl vinyl ether, stearate of vinyl vinyl / allyl acetate, 2,2-dimethyl-2 vinyl octanoate / vinyl laurate, 2,2-dimethyl-2-allyl pentanoate / vinyl laurate, vinyl dimethyl propionate / vinyl stearate, dimethyl allyl propionate / stearate,
• liposoluble polymeric polymers of vinyl ester copolymers and at least one other monomer which may be a vinyl ester, in particular vinyl neodecanoate, vinyl benzoate and vinyl t-butyl benzoate, an ⁇ olefin, an alkyl vinyl ether, or an allylic or methallyl ester.
• fat-soluble liposoluble polymers of liposoluble copolymers, and in particular those resulting from the copolymerization of vinyl esters having from 9 to 22 carbon atoms or of alkyl acrylates or methacrylates, the alkyl radicals having from 10 to 20 carbon atoms.
• Such liposoluble copolymers may be chosen from copolymers of vinyl polycrystearate, vinyl polystearate crosslinked with divinylbenzene, diallyl ether or diallyl phthalate, copolymers of stearyl poly (meth) acrylate, polyvinylpolate , poly (meth) acrylate lauryl, these poly (meth) acrylates can be crosslinked using dimethacrylate ethylene glycol or tetraethylene glycol.
• the liposoluble copolymers defined above are known and in particular described in application FR-A-2232303; they can have a weight average molecular weight ranging from 2,000 to 500,000 and preferably from 4,000 to 200,000.
• fat-soluble liposoluble polymers that can be used in the invention, mention may also be made of polyalkylenes and in particular copolymers of C2-C20 alkenes, such as polybutene, alkylcelluloses with a linear or branched alkyl radical, saturated or otherwise saturated with Cl to CS as ethylcellulose and propylcellulose, copolymers of vinylpyrrolidone (VP) and in particular copolymers of vinylpyrrolidone and of C2 to C40 and better still of C3 to C20 alkene.
• VP vinylpyrrolidone
• a copolymer of VP which may be used in the invention, mention may be made of the copolymer of VP / vinyl acetate, VP / ethyl methacrylate, polyvinylpyrrolidone (PVP) butylated, VP / ethyl methacrylate / methacrylic acid, VP / eicosene, VP / hexadecene, VP / triacontene, VP / styrene, VP / acrylic acid / lauryl methacrylate.
• PVP polyvinylpyrrolidone
• silicone resins generally soluble or swellable in silicone oils, which are crosslinked polyorganosiloxane polymers.
• the nomenclature of the silicone resins is known under the name of "MDTQ", the resin being described according to the different siloxane monomeric units that it comprises, each of the letters "MDTQ” characterizing a type of unit.
• siloxysilicate resins such as those sold under the reference SR100O by the company General Electric or under the reference TMS 803 by the company Wacker. Mention may also be made of timethylsiloxysilicate resins sold in a solvent such as cyclomethicone, sold under the name "KF-7312J” by la. Shin-Etsu Company, "DC 749", “DC 593” by Dow Corning Corporation.
• TMS trimethylsiloxysilicate
• silicone resin copolymers such as those mentioned above with polydimethylsiloxanes, such as the pressure-sensitive adhesive copolymers marketed by Dow Corning under the reference BIO-PSA and described in document US 5 162 410 or the silicone copolymers resulting from the reaction of a silicone resin, such as those described above, and a diorganosiloxane as described in document WO 2004/073626.
• the film-forming polymer is a film-forming linear ethylenic block polymer, which preferably comprises at least a first sequence and at least a second block having different glass transition temperatures (Tg), said first and second sequences being interconnected by an intermediate sequence comprising at least one constituent monomer of the first block and at least one constituent monomer of the second block.
• Tg glass transition temperatures
• the. first and second sequences and the block polymer are incompatible with each other.
• the film-forming polymer may be chosen from block or static polymers and / or copolymers comprising in particular polyurethanes, polyacrylics, silicones, fluorinated polymers, butyl gums, copolymers of ethylene, natural gums and polyvinyl alcohols and mixtures thereof.
• the monomers of the block or static copolymers comprising at least one combination of monomers whose polymer results in a glass transition temperature below room temperature (25 ° C.) may be chosen from, in particular, butadiene, ethylene, propylene, acrylic, methacrylic, isoprene, isobutene, silicone and mixtures thereof.
• the film-forming polymer may also be present in the composition in the form of particles in dispersion in an aqueous phase or in a non-aqueous solvent phase, generally known under the name of latex or pseudolatex.
• the techniques for preparing these dispersions are well known to those skilled in the art.
• composition according to the invention may comprise a plasticizer promoting the formation of a film with the film-forming polymer.
• a plasticizer may be chosen from all compounds known to those skilled in the art as being capable of performing the desired function.
• the medium containing the monodisperse particles contains a film-forming polymer
• the latter is, for example, an aqueous dispersion of acrylic, vinylic, fluorinated or silicone polymer, or mixtures thereof.
• the mass content of the film-forming polymer (s) in the composition containing the monodisperse particles ranges, for example, from 0.1 to 10%.
• the polymerization and / or crosslinking may be carried out by thermal initiation or by ultraviolet radiation.
• the polymerization can also be carried out by adding an initiator and optionally a crosslinking agent.
• This method allows the production of high molecular weight polymers or crosslinked polymers. This can make it possible to vary the rheology of the system formed.
• the medium may also comprise a polymer allowing the formation of a gel, for example before or after the application of the composition to the support to be made up.
• a polymer allowing the formation of a gel
• the formation of a gel may, for example, improve the cohesion of the network of monodisperse particles and / or render the latter sensitive to an external stimulus and / or to the concentration of a compound in the medium, for example the concentration of water.
• the polymer that makes possible the formation of a gel may be chosen from cellulose derivatives, alginates and their derivatives, in particular their derivatives such as propylene glycol alginate, or their salts, such as sodium alginate, alginate or calcium, polyacrylic or polymethacrylic acid derivatives, polyacrylamide derivatives, polyvinylpyrrolidone derivatives, ether or polyvinyl alcohol derivatives, and mixtures thereof, among others.
• the polymer may in particular be chosen from chemically modified cellulose derivatives, for example chosen from carboxymethylcellulose, sodium carboxymethylcellulose, carboxymethylhydroxyethylcellulose, carboxyethylcellulose, hydroxyethylcellulose, hydroxyethylethylcellulose,
• Hydroxypropylcellulose hydroxypropyl methylcellulose, methylcellulose, sodium methylcellulose, microcrystalline cellulose, sodium cellulose sulfate, and mixtures thereof.
• the polymer that makes possible the formation of a gel may also be chosen from natural polymeric derivatives, for example gelatin and glucomannan and galactomannan polysaccharides extracted from seeds, plant fibers, fruits, seaweeds, starch, plant resins, or of microbial origin.
• natural polymeric derivatives for example gelatin and glucomannan and galactomannan polysaccharides extracted from seeds, plant fibers, fruits, seaweeds, starch, plant resins, or of microbial origin.
• the mass quantity of polymer intended for the formation of a gel in the composition may be between 0.5 and 40%, better still between 1 and 20%.
• the polymer intended for the formation of a gel can polymerize after the application of the composition to the support to be made up. Alternatively, the gel is formed before applying the composition to the keratin materials, and then applied thereto.
• Hydrogels can be obtained from acrylamide monomers, acrylic monomers, vinylpyrrolidone for example.
• An example of a hydrogel obtained by this method based on N-isopropylacrylamide polymerized under a UV lamp in a colloidal polystyrene crystal is for example described in the patent WO 98/41859.
• the article by FOULGER et al, Advanced Materials, 13, 1898-1901 (2001) describes a hydrogel based on polyethylene glycol methacrylate and dimethacrylate.
• the realization of the gel can also take place before the manufacture of the composition. It is possible, for example, to produce an oily gel based on polydimethylsiloxane elastomer from a network of polystyrene spheres as described in the article by H. Fudouzi et al, Langmuir, 19, 9653-9660 (2003). Fatty phase
• composition containing the monodisperse particles may be oil-free
• the composition according to the invention may nevertheless comprise, in certain embodiments, a fatty phase.
• the monodisperse particles may or may not be present in this fatty phase.
• the fatty phase can in particular be volatile.
• the introduction of one or more oils can be done so as not to lose the staining effect or spectral reflectance sought.
• the composition may comprise an oil such as, for example, esters and synthetic ethers, linear or branched hydrocarbons of mineral or synthetic origin, fatty alcohols having from 8 to 26 carbon atoms, partially hydrocarbon-based fluorinated oils and / or or silicone, silicone oils such as volatile or non-volatile polymethylsiloxanes (PDMS) with a linear or cyclic silicone chain, liquid or pasty at room temperature, and mixtures thereof, other examples being given below.
• a composition according to the invention may comprise at least one volatile oil. Volatile oils
• volatile oil means an oil (or non-aqueous medium) capable of evaporating on contact with the skin in less than one hour, at ambient temperature and at atmospheric pressure.
• the volatile oil is a volatile cosmetic oil which is liquid at ambient temperature, in particular having a non-zero vapor pressure, at ambient temperature and atmospheric pressure, in particular having a vapor pressure ranging from 0.13 Pa to 40 000 Pa (10 "3 to 300 mm Hg), in particular ranging from 1.3 Pa to 13 000 Pa (0.01 to 100 mm Hg), and more particularly ranging from 1.3 Pa to 1300 Pa (0.01 to 10 mm Hg)
• the volatile hydrocarbon oils may be chosen from hydrocarbon oils of animal or vegetable origin having from 8 to 16 carbon atoms, and in particular branched C 8 -C 16 alkanes (also known as isoparaffins), such as isododecane (still known as 2,2,4,4,6-pentamethyl), isodecane isohexadecane, and for
• volatile oils for example volatile linear or cyclic silicone oils, in particular those having a viscosity ⁇ 8 centistokes (8 ⁇ 10 -6 m 2 / s), and having in particular from 2 to 10 silicon atoms, and in particular 2 to 7 silicon atoms, these silicones optionally containing alkyl or alkoxy groups having from 1 to 10 carbon atoms, for example the volatile silicone oil that can be used in the invention.
• volatile linear or cyclic silicone oils in particular those having a viscosity ⁇ 8 centistokes (8 ⁇ 10 -6 m 2 / s), and having in particular from 2 to 10 silicon atoms, and in particular 2 to 7 silicon atoms, these silicones optionally containing alkyl or alkoxy groups having from 1 to 10 carbon atoms, for example the volatile silicone oil that can be used in the invention.
• dimethicones of viscosity 5 and 6 cSt dimethicones of viscosity 5 and 6 cSt, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyl disiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, and their mixtures.
• Fluorinated volatile oils such as nonafluoromethoxybutane or perfluoromethylcyclopentane and mixtures thereof can also be used.
• Non-volatile oils A composition according to the invention may comprise a non-volatile oil.
• non-volatile oil means an oil having a vapor pressure of less than 0.13 Pa and in particular high molar.
• the non-volatile oils may in particular be chosen from fluorinated hydrocarbon oils which may be fluorinated and / or non-volatile silicone oils.
• non-volatile hydrocarbon oil which may be suitable for the implementation of the invention, mention may notably be made of:
• hydrocarbon oils of vegetable origin such as phytostearyl esters, such as phytostearyl oleate, physostearyl isostearate and lauroyl / octyldodecylglutanate / phytostearyl glutanate, for example sold under the name ELDEW PS203 by AJINOMOTO, triglycerides consisting of esters of fatty acids and of glycerol, the fatty acids of which can have various chain lengths of C 4 to C 24 , the latter being linear or branched, saturated or unsaturated; these oils are in particular heptanoic or octanoic triglycerides, wheat germ, sunflower, grape seed, sesame, corn, apricot, castor oil, shea, avocado, olive, soya, sweet almond, palm, rapeseed, cotton, hazelnut, macadamia, jojoba, alfalfa, poppy, pumpkin, squash, blackcurrant, evening prim
• Synthetic ethers having from 10 to 40 carbon atoms
• Linear or branched hydrocarbons of mineral or synthetic origin such as petroleum jelly, polydecenes, hydrogenated polyisobutene such as sesam, squalane and their mixtures, and in particular hydrogenated polyisobutene,
• Synthetic esters such as the oils of formula R 1 COOR 2 in which R 1 represents the residue of a linear or branched fatty acid comprising from 1 to 40 carbon atoms and R 2 represents a hydrocarbon chain, especially branched, containing from 1 to 40 carbon atoms provided that R 1 + R 2 is> 10.
• esters may in particular be chosen from esters, in particular of fatty acids, for example: Cetostearyl poctanoate, esters of isopropyl alcohol, such as isopropyl myristate, isopropyl palmitate, ethyl palmitate, 2-ethylhexyl palmitate, stearate or isostearate.
• esters of fatty acids for example: Cetostearyl poctanoate, esters of isopropyl alcohol, such as isopropyl myristate, isopropyl palmitate, ethyl palmitate, 2-ethylhexyl palmitate, stearate or isostearate.
• esters of diol dimers and diacid dimers such as the Lusplan DD-DA5® and Lusplan DD-D A7®, marketed by the company NIPPON FINE CHEMICAL and described in the application FR 03 02809, the liquid fatty alcohols at room temperature to branched and / or unsaturated carbon chain having 12 to 26 carbon atoms such as 2-octyldodecanol, isostearyl alcohol, oleic alcohol, 2-hexyldecanol, 2-butyloctanol, and 2-undecylpentadecanol,
• Higher fatty acids such as oleic acid, linoleic acid, linolenic acid and mixtures thereof, and
• Di-alkyl carbonates the 2 alkyl chains which may be identical or different, such as dicaprylyl carbonate sold under the name Cetiol CC®, by Cognis,
• Non-volatile silicone oils such as, for example, non-volatile polydimethylsiloxanes (PDMS), polydimethylsiloxanes comprising pendant alkyl or alkoxy groups and / or silicone chain ends, groups each having from 2 to 24 carbon atoms, silicones phenylated as phenyl trimethicones, phenyl dimethicones, phenyl trimethylsiloxy diphenylsiloxanes, diphenyl dimethicones, diphenyl methyldiphenyl trisiloxanes, and 2-phenylethyl trimethylsiloxysilicates, dimethicones or phenyltrimethicone with a viscosity less than or equal to 100 Cst, and mixtures thereof, and mixtures thereof.
• PDMS non-volatile polydimethylsiloxanes
• composition containing the monodisperse particles may be free of oil, in particular containing no non-volatile oil.
• the invention also relates to kits comprising a composition according to the invention.
• kits may comprise at least one composition intended to form a base layer, also called “base coat” and / or a recoaming layer also called “top coat”.
• the kit may thus comprise: a first composition comprising:
• a medium allowing the formation on a support on which the composition is applied of an ordered network of monodisperse particles; a second composition comprising a film-forming polymer.
• Such a composition may allow the formation of a base layer or covering.
• the kit may also comprise, according to a variant:
• a first composition comprising: monodisperse particles,
• a second composition comprising at least one coloring agent, for example a black pigment or dye, or an effect pigment (reflecting particles, nacres, goniochromatic coloring agents, diffracting pigments).
• a coloring agent for example a black pigment or dye, or an effect pigment (reflecting particles, nacres, goniochromatic coloring agents, diffracting pigments).
• Such a second composition can improve or modify the optical properties of the first composition.
• kit may then comprise: a first cosmetic composition comprising:
• a physiologically acceptable medium allowing the formation on a support on which the composition is applied of an ordered network of monodisperse particles; a second cosmetic composition to be applied to the support before the application of the first composition, so as to improve the adhesion of the latter on the support and smooth the keratinous surfaces,
• Base layer
• the base layer is compatible with its application on keratin materials, for example skin, lips, nails, eyelashes or hair, depending on the nature of the desired makeup, including one of those listed above.
• the base layer may comprise a polymer chosen in particular from film-forming polymers.
• the base layer can, according to different aspects of the invention, perform one or more of the following functions:
• the base layer can smooth the support before the application of the composition comprising the monodisperse particles in order to facilitate the formation of the first layers of the network and to obtain a network with the widest possible monocrystalline zones,
• the base layer can color the support in order to bring out or modify the color produced by the network.
• the base layer may comprise at least one coloring agent making it possible to reduce the clarity of the support.
• the base layer may for example comprise a pigment or a black dye, or another color, to create a colored background for adding an additional color to a color given by the network of monodisperse particles.
• the dyes or pigments that may be present in the base layer there may be mentioned in particular black iron oxide, carbon black, black titanium dioxide;
• the base layer can improve the adhesion of the composition containing the monodisperse particles to the coated support.
• the base layer may comprise at least one polymer having adhesive or adhesive properties, that is to say capable of becoming adhesive by interaction with another compound.
• the polymer may in particular have adhesive or adhesive properties in the meaning given in patents FR 2834884, FR 2811546 and FR 2811547.
• the base layer may also exert an action on the surface tension of the keratin materials in order, for example, to allow a good wettability by the composition layer containing the monodisperse particles and promote the stacking of monodisperse particles.
• the base layer may comprise the same polymer providing at least two of the aforementioned functions, for example those of smoothing and increasing adhesion, or possibly a coloring function.
• the base layer can be formulated according to the nature of the monodisperse particles.
• the monodisperse particles may be of polystyrene and the base layer comprise a non-aqueous dispersion NAD in isododecane or polymers DAITOSOL (Daito Kasei) or ULTRASOL (Ganz Chemical ).
• the monodisperse particles being silica
• the base layer may comprise Eastman AQ polymer (20%) or PVA (10%).
• the base layer may comprise a volatile phase.
• the polymer is preferably capable of forming a film after application and drying of the composition.
• the formation of the film can be done with the aid of a coalescing agent.
• the polymer may be in dispersion or in solution in an aqueous or anhydrous phase. This polymer is preferably dispersed in water or in an oil. Even more preferably, the polymer contains at least one function capable of being ionized in aqueous solution, such as a carboxylic acid.
• the polymer will preferably be insoluble in contact with an aqueous phase after application and drying. It is also possible to use according to this process in the base layer monomers or prepolymers which are also able to polymerize after application to the skin, either by UV action, heat or the presence of water for example. Examples that may be mentioned include cyanoacrylate monomers or low mass silicone polymers carrying reactive functions.
• polymers in aqueous dispersion examples include: Ultrasol 2075 from Ganz Chemical, Daitosol 5000AD from Daito Kasei, Avalure UR 450 from Noveon, DYNAMX from National Starch, Syntran 5760 from Interpolymer, Acusol OP 301 from Rohm & Haas, Neocryl A 1090 of Avecia.
• an oily dispersion polymer mention may be made of: NAD and polymers as disclosed in the patent application EP-AI 411 069 from the company L'Oréal or the acrylic-silicone polymer dispersion ACRIT 8HV-1023 from the company Tasei Chemical industries.
• the volatile phase may be an aqueous phase or an anhydrous phase.
• an aqueous phase it is constituted, preferably water, alcohol and glycol.
• anhydrous phase it is preferably composed of at least one volatile oil.
• the particular function of the cover layer may be to change a visible characteristic such as the color or the gloss and / or the function of improving the resistance of the network of monodisperse particles to the support, in particular to increase the resistance to friction of the network and avoid its crumbling.
• the covering layer may comprise one or more polymers capable of penetrating or not into the particle network, the penetration of the polymer may cause a change in the refractive index of the medium around the particles and therefore a change in color, as mentioned upper.
• the covering layer may have a volatile phase, which may make it possible to limit the color change over time, which may cease during the evaporation of the volatile phase.
• the second composition may especially comprise a volatile oil, as defined above.
• the cover layer may include a non-volatile solvent, which may increase the durability of the color change. This solvent will penetrate and remain in the medium between the particles and modify the refractive index around the particles.
• the second composition intended to form the covering layer may thus comprise a non-volatile oil, as defined above.
• the cover layer may have a high transparency to avoid affecting color and / or color intensity from the monodisperse particle array.
• the covering layer can be colored further, for example to exert an influence on the color and / or the brightness produced by the network of monodisperse particles.
• the cover layer can further slow down moisture uptake or drying of the composition layer containing the ordered network and reduce the variability of the result over time.
• the covering layer can, on the contrary, increase the sensitivity to the environment, in order to create, for example, a dependence of the color on the ambient temperature or humidity.
• the covering layer preferably comprises a film-forming polymer.
• the formulation of the covering layer can be adapted to the nature of the monodisperse particles.
• the coating layer may comprise a non-aqueous NAD dispersion in isododecane.
• the coating layer may comprise, for example, an acrylic copolymer or PVA.
• the covering layer comprises, for example, a non-aqueous dispersion NAD, PVA (10%) or Eastman AQ (20%), DAITOSOL or ULTRASOL polymers.
• the cover layer may contain monodisperse particles having an average size different from those of the monodisperse particles covered by the cover layer. This can change the color of the underlying composition.
• the covering layer may in this case be covered, optionally, by a layer intended to improve the holding. additives
• the cosmetic composition containing the monodisperse particles, the base layer and the covering layer may comprise at least one additive chosen from the usual adjuvants in the cosmetics field, such as fillers, hydrophilic or lipophilic gelling agents, and active, water-soluble or fat-soluble agents. preservatives, moisturizers such as polyols and in particular glycerin, sequestering agents, antioxidants, solvents, perfumes, physical and chemical sunscreens, in particular with UVA and / or UVB, odor absorbers, pH adjusters (acids or bases) and mixtures thereof.
• the at least one additive may be chosen from those mentioned in
• composition containing the monodisperse particles may be in different galenical forms used in the cosmetic field, used for topical application: direct, inverse or multiple emulsions, gel, creams, solutions, suspensions, lotions.
• the composition may be in the form of an aqueous solution or an oily solution, in particular gelled, of emulsion of liquid or semi-liquid consistency of the milk type, obtained by dispersion of a fatty phase in an aqueous phase (HfE) or conversely (E / H), a triple emulsion (W / O / E or H / E / H), or suspension or emulsion of soft consistency.
• HfE a fatty phase in an aqueous phase
• E / H conversely
• W / O / E or H / E / H a triple emulsion
• suspension or emulsion of soft consistency obtained by dispersion of a fatty phase in an aqueous phase (HfE) or conversely (E / H), a triple emulsion (W / O / E or H / E / H), or suspension or emulsion of soft consistency.
• the composition according to the invention containing the monodisperse particles may constitute a skincare, make-up and / or sun protection composition.
• the composition may be in the form of a facial makeup product, especially the skin and / or lips, eyes or nails. Makeup processes
• the subject of the invention is also a method for making up keratin materials, comprising the following steps:
• a base layer to a support to be made up, applying to the base layer a cosmetic composition comprising monodisperse particles and a medium allowing the formation of an ordered network of monodisperse particles.
• Such a process makes it possible to improve the quality of application of the composition comprising the monodisperse particles, especially when they are in an aqueous medium, and also makes it possible to obtain good "crystallization" after application to the skin or the hair for example.
• the base layer makes it possible, as mentioned above, to control and standardize the surface properties of the keratin materials, especially the surface tension. It also smoothes and evenens surface roughness. An electrostatic repulsion effect can also occur if the base layer is likely to create an electrostatic charge in contact with water.
• the base layer may optionally have the effect of fixing the layer of monodisperse particles, making it more stable with respect to external aggressions.
• the base layer preferably contains a polymer and a volatile phase.
• composition containing the monodisperse particles may comprise an aqueous medium.
• the base layer may comprise, as mentioned above, a polymer having adhesive properties and / or a coloring agent, in particular of black color.
• the application of the composition containing the monodisperse particles may be carried out after drying of the base layer, for example for a duration greater than or equal to 30 s.
• the subject of the invention is, according to another of its aspects, a method comprising the following steps: applying a composition comprising monodisperse particles and a medium allowing the formation of an ordered network of monodisperse particles to be applied to a support for makeup, optionally covered with a base layer,
• the covering layer may comprise a film-forming polymer as mentioned above.
• the application of the covering layer can be carried out after drying of the composition layer containing the monodisperse particles, for example for a duration greater than or equal to 30 s.
• the subject of the invention is also a method in which a first network of monodisperse particles having a mean size is formed, and then a second network of monodisperse particles having an average size different from those of the first network is formed above this first network. .
• the subject of the invention is, according to another of its aspects, a method comprising the following steps: applying a first composition comprising monodisperse particles and a medium allowing the formation of a network of these particles, - applying to the first composition a second composition for changing the color or other visible characteristic of the first composition, in particular by modifying the refractive index of the medium around the particle network and / or by changing the distance between the particles of the network.
• the applicant has in particular found that it is possible to modify the coloration obtained by a first cosmetic composition by a second non-colored composition, subsequently applied.
• the crystal lattice formed by the first composition may be composed of a continuous layer or of discontinuous islands.
• the light is diffracted by this crystal lattice and the diffracted wavelength depends on the distance between the particles and the refractive index.
• the second composition which forms the covering layer, may contain at least one liquid medium capable of penetrating into the first composition and of change the distance between the particles and / or the refractive index.
• the liquid medium may be volatile or not. In the case where it is completely volatile, the color change is temporary and the color gradually returns to the initial state. In the case where a large proportion of the liquid medium is non-volatile, a lasting change in the color can be obtained.
• the crystal lattice may be compact or not, continuous or not. It can be formed prior to application or formed during application.
• the second composition may contain at least one liquid phase, which may come to swell the network or change the refractive index of the medium.
• the liquid phase may have a different refractive index of the medium surrounding the mondispersed particles.
• the second composition may also contain a polymer to fix the first composition.
• monomers or prepolymers which are also able to polymerize after application to the skin, either by UV action, heat or the presence of water, for example.
• examples that may be mentioned include cyanoacrylate monomers or low mass silicone polymers carrying reactive functions.
• a colored or non-colored base layer may optionally be applied before these two compositions to the keratin materials.
• the subject of the invention is a process in which an array of monodisperse particles on keratin materials is formed and a composition is applied to this network making it possible to modify the refractive index around the particles of the keratinous material. networks, especially those of the network surface layer, which may make it possible to change the color. Modes of application
• the composition containing the monodisperse particles, and possibly the compositions intended to form the base and covering layers, can be applied using an applicator, preferably flocked, for example a tip or a flocked foam, or a brush, especially with fine and supple hair.
• the application may also be carried out differently, for example by means of a foam, a felt, a spatula, a frit, a brush, a comb, a woven or not woven.
• the application may also be carried out with the finger or by directly depositing the composition on the support to be treated, for example by spraying or spraying using for example a piezoelectric device or by transfer of a layer of composition deposited on an intermediate support.
• the composition containing the monodisperse particles may be applied in a thickness of, for example, between 1 and 10 ⁇ m, better still between 2 and 5 ⁇ m.
• composition containing the monodisperse particles is carried out for example with a specific gravity of between 1 and 5 mg / cm 2 .
• the network of monodisperse particles that is formed comprises for example at least six layers of particles, better between six and 20 layers.
• the application of the composition to the keratin materials can be done in such a way as to allow the network of monodisperse particles to form after the deposition.
• the medium of the composition can be formulated in such a way that the evaporation of the solvent (s) it contains is sufficiently slow to allow the particles to time to order and also to limit the risk of disorderly agglomeration of the particles. before application.
• the covering layer is for example applied to a thickness ranging from 0.5 to 10 ⁇ m.
• the base layer is for example applied to a thickness ranging from 0.5 to 10 ⁇ m.
• the application of the covering layer can be done by spraying, which reduces the risk of damage to the underlying lattice. Conditioning
• the composition may be packaged in any receptacle or on any support provided for this purpose.
• the composition may be in the form of a kit comprising two compositions packaged in two separate receptacles.
• the composition may be in the form of a kit comprising a first receptacle containing the composition comprising the monodisperse particles and a second receptacle containing at least one of the compositions intended to form the base layer and the covering layer.
• the white-colored composition After applying 2 mg.cm- 2 of the composition to a keratin material, for example an artificial skin sample, the white-colored composition turns green and very bright in a few seconds, then takes on a dominant blue color during drying. The final color is dependent on the observation angle.
• the electron microscopic observation of the deposit reveals a compact crystalline stack of particles in a face-centered cubic lattice.
• Monodisperse silica particles (average size 220 nm) 30% Ultrapure water 70%
• This composition can be prepared by diluting the Nippon Shokubai Seahoster ® KE-W20 product (monodisperse silica of average size 220 nm at a concentration of 20% in water, with a conductivity of 180 ⁇ S.cm -1 ) up to mass concentration of 10% with ultrapure water (conductivity 0.5 ⁇ S.cm -1 ), then centrifuging the mixture for 30 minutes at a speed of 4000 rpm. The supernatant is removed after centrifugation. The final concentration of silica particles is adjusted to 30% by mass.
• the base layer a) is first applied (applied amount 2.5 mg.cm -2 ), for example on the skin, then after a few minutes of drying, the composition b) is applied (amount applied 3 mg.cm "2 ).
• the application can be done for example with a flocked tip.
• the color obtained varies from violet to green according to the angle of observation, with a dominant blue.
• the base layer is identical to that of Example 2.
• composition containing the monodisperse particles may be prepared by replacing the product Seahoster KE-W20 ® by the product Seahoster KE-W25 of NipponShokubai company (monodisperse silica having a mean size of 250 nm at a concentration of 20% in the conductivity of water 55 ⁇ S.cm -1 ), following an identical procedure.
• the base layer is first applied (applied amount 2.5 mg.cm -2 ), for example on the skin, then after a few minutes of drying, the composition containing the monodisperse particles (amount applied 2.5 mg.cm -2 ).
• the application can be done for example using a flocked tip.
• the color obtained varies from blue to yellow according to the angle of observation, with a dominant green.
• Example 4 Makeup Kit The base layer is identical to that of Example 2.
• the base layer is first applied (applied amount 2.5 mg.cm -2 ), for example on the skin, and after a few minutes of drying, the composition containing the monodisperse particles (applied amount 2.5 mg.cm "2 ).
• the color obtained after application and drying varies according to the angle of observation, with a dominant red.
• the base layer is identical to that of Example 2.
• the composition containing the monodisperse particles has the following formulation:
• Polystyrene particles (average size 290 nm) 30%
• the base layer is first applied (applied amount 2.5 mg.cm -2 ), for example on the skin, and after a few minutes of drying, the composition containing the monodisperse particles (applied amount 2 mg.cm "2 ).
• Example 6 Makeup Kit The base layer is identical to Example 2.
• composition containing the monodisperse particles has the following formulation:
• This composition can be prepared by centrifuging the product Optibind ®
• the base layer is first applied (applied amount 2.5 mg.cm -2 ), for example on the skin, and after a few minutes of drying, the composition containing the monodisperse particles (applied amount 2 mg.cm "2 ).
• the color obtained after application and drying varies according to the angle of observation, with a dominant red.
• the presence of the polymer in the composition containing the monodisperse particles makes it possible to improve the frictional resistance of the product.
• the base layer can be obtained as follows:
• the iron oxide is first ground in butylene glycol.
• the water and the other components are added with stirring to the aqueous polymer dispersion.
• composition containing the monodisperse particles is identical to that of Example 3.
• the base layer is first applied (applied amount 2.5 mg.cm -2 ), for example on the skin, and after a few minutes of drying, the composition containing the monodisperse particles (amount applied 3 mg.cm '2 ).
• the color obtained is a very bright green.
• Example 8 Makeup Kit The aqueous base layer and the composition containing the monodisperse particles are identical to those of Example 3. Recoat layer
• the cover layer is prepared as follows: A dispersion of copolymers of methyl acrylate and acrylic acid in a 95: 5 ratio in isododecane is prepared according to the method of Example 1 of EP-A -749 746 incorporated by reference, replacing heptane with isododecane. A dispersion of particles surface-stabilized in isododecane with a diblock copolymer polystyrene / copoly (ethylene-propylene), sold under the name KRATON Gl 701 ® (shell) having a dry matter content of 24.6% in weight. This copolymer is film-forming.
• the base layer is first applied (applied amount 2.5 mg.cm -2 ), for example on the skin, and after a few minutes of drying, the composition is applied. containing the monodisperse particles (amount applied 2.5 mg.cm -2 ) After complete drying, the covering layer (applied amount 1 mg.cm -2 ) is applied.
• the formulations are applied (amount applied 2 mg / cm 2) on a mimetic support of the skin.
• the color obtained after application and drying varies according to the angle of observation, with a dominant red.
• the observation under the electron microscope of the deposit reveals a compact crystalline stack of the silica particles.
• the formulations are applied (applied amount 2 mg / cm 2 ) on eyelashes.
• the color obtained after application and drying is blue.
• the observation under the electron microscope of the deposit reveals a compact crystalline stack of the silica particles.
• the formulations are applied (quantity applied 2 mg / cm 2 ) on a mimetic support of the skin. No color is obtained after application and drying, the deposit being simply white. The observation under the electron microscope of the deposit does not show any compact crystal lattice of the silica particles.
• the formulation is applied (quantity applied 2 mg / cm 2) on a mimetic support of the skin.
• the deposit is substantially transparent after application and drying and selectively reflects light in PUV.
• the electron microscopic observation of the deposit reveals a compact crystal lattice of silica particles.
• Such a formulation thus makes it possible to effectively protect the skin from UV radiation.
• the formulation is prepared as follows: the PS particles are concentrated by centrifugation to reach a concentration of 40% in water. Bentone is predispersed separately in the silicone oil. The two phases are mixed under gentle stirring at room temperature so as to produce a water-in-oil emulsion with a size of about 20 microns. This formulation gives a green color just after application then blue after complete drying of the two phases.
• the formulation is prepared as follows: the PS particles are concentrated by centrifugation to arrive at the desired concentration.
• the oily phase is mixed separately. Both phases are mixed at room temperature under low stirring to produce a water-in-oil emulsion with a size of about 20 microns.
• This formulation gives a green color after application on the skin.
• the formulation is prepared as follows: the PS particles are concentrated by centrifugation to reach the desired concentration.
• the oily phase is mixed separately.
• the two phases are mixed at room temperature with gentle stirring so as to produce an oil-in-water emulsion.
• This formulation gives a green color just after application then blue after complete drying of the two phases.
• the base layer is first applied (amount applied 2.5 mg.cm -2 ), for example on the skin, and after a few minutes of drying, the composition containing the monodisperse particles (applied amount 2.5 mg) is applied. .cm- 2 ).
• the color obtained after application and drying varies according to the angle of observation, with a dominant red.
• the application can be done for example with a flocked tip.
• the resulting color is much brighter and less whitish than without a base coat.
• the friction resistance of the second layer is also improved by the presence of the base layer.
• Example 24 Makeup Kit a) Base layer The base layer is prepared as follows:
• a dispersion of copolymers of methyl acrylate and acrylic acid in a ratio of 95: 5 in isododecane is prepared according to the method of Example 1 of EP-A-749,746, replacing heptane by isododecane.
• a dispersion of surface-stabilized particles in isododecane is obtained by a polystyrene / copoly (ethylene-propylene) block diblock copolymer sold under the name Kraton® G1701 (shell), having a solids content of 24.6% by weight. weight. This copolymer is film-forming.
• composition containing the monodisperse particles Particles of monodisperse PS of size 290nm * 30
• the base layer is first applied (amount applied 2.5 mg.cm -2 ), for example on the skin, and after a few minutes of drying, the composition containing the monodisperse particles (applied amount 2.5 mg) is applied. .cm- 2 ). After complete drying, the initial composition can be applied as an overlay (amount applied 1 mg.cm -2 ).
• composition containing the monodisperse particles has the following formulation:
• a basecoat consisting of Ultrasol® 2075C (Ganz Chemical) is first applied (applied amount 2.5 mg.cm- 2 ), for example on the skin, and after a few minutes of drying, the composition containing monodisperse particles (quantity applied 2 mg.cm -2 ).
• the color obtained after application and drying varies according to the angle of observation, with a dominant red.
• the presence of the polymer in the composition containing the monodisperse particles makes it possible to improve the frictional resistance of the product.
• Example 26 Water-in-oil emulsion Monodisperse PS particles of size 216 nm * 28 Water 42 Cyclomethicone 10
• composition is prepared in the following manner: the PS particles are concentrated by centrifugation to arrive at the desired concentration.
• the oily phase is mixed separately.
• the two phases are mixed at room temperature with gentle stirring to produce a water-in-oil emulsion.
• This composition gives a green color just after application then blue after complete drying of the two phases.
• the different compositions are applied on a black support.
• the composition of Example 27 has a violet color.
• the composition of Example 28 has a green-yellow color with highlight points.
• the composition of Example 29 is green in color with blue highlights.
• the composition of Example 30 is blue in color with midnight blue highlights.
• the composition of Example 31 is blue in color with green highlight points in the form of rods.
• compositions that change the color Composition A (Example 32) Eastman AQ 55 Sl 20%
• Polyester marketed by Eastman Chemical.
• composition B (Example 33) Sylgard 184 Silicone Elastomer Base 50%
• Hexamethyldisiloxane 45% The initially blue composition becomes blue-green after application and drying of compositions A or B.
• Example 34 Water-in-oil emulsion
• composition is prepared in the following manner: the PS particles are concentrated by centrifugation to arrive at the desired concentration.
• the oily phase is mixed separately.
• the two phases are mixed at room temperature with gentle stirring to produce a water-in-oil emulsion.
• This formulation gives a green color just after application then blue after complete drying of two phases.
• mica particles of size 10 ⁇ m marketed by SCIAMA *** mica particles of size 10 ⁇ m marketed by SCIAMA
• the photograph corresponding to FIG. 2 represents the network of the composition of Example 35 after deposition and drying, using the HITACHI S-4500 electron microscope.

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