WO2005030155A1 - Composition de photoprotection a base de phase aqueuse continue contenant un polymere comportant au moins de blocs mutuellement incompatibles et ayant differentes temperatures de transition vitreuse - Google Patents

Composition de photoprotection a base de phase aqueuse continue contenant un polymere comportant au moins de blocs mutuellement incompatibles et ayant differentes temperatures de transition vitreuse Download PDF

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Publication number
WO2005030155A1
WO2005030155A1 PCT/EP2004/010989 EP2004010989W WO2005030155A1 WO 2005030155 A1 WO2005030155 A1 WO 2005030155A1 EP 2004010989 W EP2004010989 W EP 2004010989W WO 2005030155 A1 WO2005030155 A1 WO 2005030155A1
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block
composition according
equal
monomers
polymer
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PCT/EP2004/010989
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English (en)
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Nathalie Seyler
Didier Candau
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L'oréal
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Priority claimed from FR0311308A external-priority patent/FR2860155A1/fr
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Publication of WO2005030155A1 publication Critical patent/WO2005030155A1/fr

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    • 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
    • A61K8/90—Block copolymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
    • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations

Definitions

  • UV-A rays having wavelengths of between 320 and 400 nm which cause tanning of the skin, are capable of inducing its impairment, in particular in the case of a sensitive skin or a skin continually exposed to solar radiation.
  • UV-A rays cause in particular a loss of elasticity of the skin and the appearance of wrinkles which lead to premature ageing. They promote the onset of the erythematous reaction or amplify this reaction in some subjects and may even be responsible for phototoxic or photoallergic reactions. It is therefore desirable to also screen out UV-A radiation.
  • UVA and UVB rays must therefore be screened out and there are currently numerous cosmetic compositions for protecting the human epidermis which contain UVA-screening agents and/or UVB-screening agents in continuous aqueous phase-based carriers.
  • These screening agents (and their quantities) being selected according to the desired sun protection factor, the sun protection factor (SPF) being mathematically expressed by the ratio of the dose of UV radiation necessary to reach the erythematogenic threshold to the UV-screening agent for the dose of UV radiation necessary to reach the erythematogenic threshold without UV-screening agent.
  • SPF sun protection factor
  • continuous phase-based carrier is understood to mean
  • any monophase carrier comprising a single aqueous phase: for example aqueous lotion, serum, suspension, gel or stick
  • any multiphase carrier comprising at least one aqueous dispersing continuous phase and at least one second dispersed immiscible phase such as an oily phase: for example oil-water simple emulsions or water/oil/water type multiple emulsions.
  • oily phase for example oil-water simple emulsions or water/oil/water type multiple emulsions.
  • a polymer termed block polymer, comprising at least one first block and at least one second block which are incompatible with each other and have different glass transition temperatures (Tg) , the said first and second blocks being linked to each other by an intermediate segment comprising at least one monomer constituting the first block and at least one monomer constituting the second block, the said polymer having a polydispersity value V greater than 2.
  • Tg glass transition temperatures
  • the first and second blocks of the block polymer are incompatible with each other.
  • blocks incompatible with each other is understood to mean that the mixture formed of the polymer corresponding to the first block and of the polymer corresponding to the second block is not miscible in the predominant polymerization solvent by weight of the block polymer, at room temperature (25°C) and atmospheric pressure (105 Pa) , for a content of the polymer mixture greater than or equal to 5% by weight relative to the total weight of the mixture (polymers and solvent), it being understood that: i) the said polymers are present in the mixture in a content such that the respective weight ratio ranges from 10/90 to 90/10, and that ii) each of the polymers corresponding to the first and second block has a (weight- or number-) average molecular mass equal to that of the block polymer +/- 15%.
  • the said polymer mixture is immiscible in at least one of them.
  • the latter is the predominant solvent.
  • the intermediate segment comprising at least one monomer constituting the first block and at least one monomer constituting the second block of the polymer makes it possible to "count" these blocks.
  • these block polymers may be incorporated into compositions having a high dry matter content, typically greater than 10% and exhibit ease of formulation. Used in anti-sun products, they improve both their sun protection factor and their qualities of spreading on the skin or the other human keratinous materials (hair, scalp, lips, nails, eyelashes, eyebrows) .
  • the invention relates to photoprotective compositions, characterized in that they comprise, in a continuous aqueous phase-based physiologically acceptable carrier:
  • the invention also relates to the use of a block polymer as defined above in a photoprotective composition comprising, in a continuous aqueous phase- based physiologically acceptable carrier, at least one photoprotective system capable of screening out UV radiation, as agent making it possible to increase the sun protection factor (SPF) of the said composition.
  • a photoprotective composition comprising, in a continuous aqueous phase- based physiologically acceptable carrier, at least one photoprotective system capable of screening out UV radiation, as agent making it possible to increase the sun protection factor (SPF) of the said composition.
  • photoprotective system capable of screening out UV radiation is understood to mean any compound or mixtures of synthetic or natural, organic or inorganic compounds capable of screening out radiation ranging from 280 to 400 nm and having good compatibility with human keratinous materials (skin, hair, scalp, lips, nails, eyelashes, eyebrows).
  • the said compounds may be a simple molecule or a polymer.
  • the screening of UV radiation may result from a phenomenon of absorption, reflection and/or diffusion.
  • physiologically acceptable carrier is understood to mean any carrier which is compatible with human keratinous materials such as the skin, the hair, the scalp, the lips, the eyelashes, the eyebrows and the nails.
  • the invention also relates to the use of the polymer according to the invention in a cosmetic composition as an agent for improving the staying power of the said composition.
  • the polymer according to the invention is an ethylenic polymer having a linear structure.
  • a polymer having a non-linear structure is for example a polymer having a branched, a star-shaped or a graft structure, and the like.
  • the polymer according to the invention is not an elastomer.
  • non-elastomeric polymer is understood to mean a polymer which, when it is subjected to a stress designed to pull it (for example by 30% relative to its initial length) , does not return to a length substantially identical to its initial length when the stress ceases . More specifically, the expression “non- elastomeric polymer” denotes a polymer having an instantaneous recovery Ri ⁇ 50% and a delayed recovery R 2h ⁇ 70% after having been subjected to a 30% extension. Preferably, Ri is ⁇ 30%, and R 2h ⁇ 50%.
  • the non-elastomeric character of the polymer is determined according to the following protocol : a polymer film is prepared by pouring a solution of the polymer into a tefloned mould and then drying for 7 days in a controlled environment at 23 ⁇ 5°C and 50 ⁇ 10% relative humidity. A film of about 100 (im thick is then obtained from which rectangular test pieces are cut out (for example with a hollow punch) 15 mm wide and 80 mm long. A tensile stress is applied to this sample with the aid of an apparatus marketed under the reference Zwick, under the same temperature and humidity conditions as for the drying.
  • the test pieces are pulled at a speed of 50 mm/min and the distance between the jaws is 50 mm, which corresponds to the initial length (I 0 ) of the test piece.
  • the instant recovery Ri is determined in the following manner: - the test piece is pulled by 30% ( ⁇ max ) , that is to say about 0.3 times its initial length (I 0 ) the stress is released by applying a return speed equal to the pulling speed, that is 50 mm/min, and the residual extension of the test piece is measured as a percentage, after returning to zero stress ( ⁇ i) .
  • a polymer according to one embodiment of the invention has an instant recovery Ri of 10% and a delayed recovery R h of 30%.
  • the block polymer of the composition according to the invention comprises at least one first block and at least one second block incompatible with each other and which have different glass transition temperatures (Tg) , the said first and second blocks being linked to each other by an intermediate segment comprising at least one monomer constituting the first block and at least one monomer constituting the second block.
  • Tg glass transition temperatures
  • the block polymer of the composition according to the invention has a polydispersity value V greater than or equal to 2, for example ranging from 2 to 9 , preferably greater than or equal to 2.5, for example ranging from 2.5 to 8, and even better greater than or equal to 2.8 and in particular ranging from 2.8 to 6.
  • the polydispersity value V of the polymer is equal to the ratio of the weight-average mass Mw to the number-average mass Mn.
  • the weight-average (Mw) and the number- average (Mn) molar masses are determined by gel permeation liquid chromatography (solvent THF, calibration curve established with linear polystyrene standards, refractometric detector) .
  • the number-average mass (Mw) of the polymer according to the invention is preferably less than or equal to 300 000, it ranges for example from 35 000 to 200 000, and even better from 45 000 to 150 000.
  • the number-average mass (Mn) of the polymer according to the invention is preferably less than or equal to 70 000, it ranges for example from 10 000 to 60 000, and even better from 12 000 to 50 000.
  • Each block of the polymer according to the invention is derived from one type of monomer or from several types of different monomers. That means that each block may consist of a homopolymer or of a copolymer; this copolymer constituting the block may in turn be random or alternating.
  • the intermediate segment comprising at least one monomer constituting the first block and at least one monomer constituting the second block of the polymer is a random polymer.
  • the intermediate block is essentially derived from monomers constituting the first block and the second block.
  • the expression "essentially” is understood to mean at least 85%, preferably at least 90%, even better 95% and better still 100%.
  • the intermediate sequence has a glass transition temperature Tg between the glass transition temperatures of the first and second blocks. According to the invention, the first and second blocks have different glass transition temperatures.
  • the glass transition temperatures indicated for the first and second blocks may be theoretical Tg values determined from the theoretical Tg values for the monomers constituting each of the blocks, which can be found in a reference manual such as Polymer Handbook, 3rd ed, 1989, John Wiley, according to the equation ,
  • Tgi being the glass transition temperature of the homopolymer of the monomer i .
  • Tg values indicated for the first and second blocks in the present application are theoretical Tg values.
  • the difference between the glass transition temperatures of the first and second blocks is generally greater than 10°C, preferably greater than 20°C, and even better greater than 30°C.
  • the first block may be chosen from: a) a block having a Tg greater than or equal to 40°C, b) a block having a Tg less than or equal to 20°C, c) a block having a Tg between 20 and 40°C, and the second block chosen from a category a) , b) or c) different from the first block.
  • the expression: "between ... and " is understood to mean in the present invention a range of values from which the limits mentioned are excluded, and "from ... to " and “ranging from ... to " is understood to mean in the present invention a range of values including the limits.
  • A) Block having a Tg greater than or equal to 40°C The block having a Tg greater than or equal to 40°C has for example a Tg ranging from 40 to 150°C, preferably greater than or equal to 50°C, ranging for example from 50°C to 120°C, and even better greater than or equal to 60°C, ranging for example from 60°C to 120°C.
  • the block having a Tg greater than or equal to 40°C may be a homopolymer or a copolymer. In the case where this block is a homopolymer, it is derived from monomers which are such that the homopolymers prepared from these monomers have glass transition temperatures greater than or equal to 40°C.
  • This first block may be a homopolymer consisting of a single type of monomer (for which the Tg of the corresponding homopolymer is greater than or equal to 40°C) .
  • the first block may be derived totally or partly from one or more monomers, the nature and concentration of which are chosen so that the Tg of the resultant copolymer is greater than or equal to 40°C.
  • the copolymer may for example comprise: monomers which are such that the homopolymers prepared from these monomers have Tg values greater than or equal to 40°C, for example a Tg ranging from 40 to 150°C, preferably greater than or equal to 50°C, ranging for example from 50°C to 120°C, and even better greater than or equal to 60°C, ranging for example from 60°C to 120°C, and monomers which are such that the homopolymers prepared from these monomers have Tg values less than 40°C, chosen from monomers having a Tg between 20 and 40°C and/or monomers having a Tg less than or equal to 20°C, for example a Tg ranging from -100 to 20°C, preferably less than 15°C, in particular ranging from -80°C to 15°C and even better less than 10°C, for example ranging from -50°C to 0°C, as described later.
  • R 7 and R 8 which are identical or different, each represent a hydrogen atom or a linear or branched Ci to C ⁇ alkyl group, such as an n-butyl, t-butyl, isopropyl, isohexyl, isooctyl or isononyl group; or R 7 represents H and R 8 represents a 1, 1-dimethyl-3-oxobutyl group, and R' denotes H or methyl.
  • monomers there may be mentioned N-butylacrylamide, N-t-butyl- acrylamide, N-isopropylacrylamide, N, N-dimethyl- acrylamide and N,N-dibutylacrylamide, and mixtures thereof .
  • Particularly preferred principal monomers are methyl methacrylate, isobutyl (meth) acrylate, isobornyl (meth) acrylate and mixtures thereof.
  • Block having a Tg less than or equal to 20°C has for example a Tg ranging from -100 to 20°C, preferably less than or equal to 15°C, in particular ranging from -80°C to 15°C and even better less than or equal to 10°C, for example ranging from -50°C to 0°C .
  • the block having a Tg less than or equal to 20°C may be a homopolymer or a copolymer. In the case where this block is a homopolymer, it is derived from monomers which are such that the homopolymers prepared from these monomers have glass transition temperatures less than or equal to 20°C.
  • This second block may be a homopolymer consisting of a single type of monomer (for which the Tg of the corresponding homopolymer is less than or equal to 20°C) .
  • the block having a Tg less than or equal to 20°C is a copolymer, it may be derived totally or partly from one or more monomers, the nature and concentration of which are chosen so that the Tg of the resulting copolymer is less than or equal to 20°C.
  • It may for example comprise one or more monomers whose corresponding homopolymer has a Tg less than or equal to 20°C, for example a Tg ranging from -100°C to 20°C, preferably less than 15°C, in particular ranging from -80°C to 15°C and even better less than 10°C, for example ranging from -50°C to 0°C, and one or more monomers whose corresponding homopolymer has a Tg greater than 20°C, such as monomers having a Tg greater than or equal to 40°C, for example a Tg ranging from 40 to 150°C, preferably greater than or equal to 50°C, ranging for example from 50°C to 120°C, and even better greater than or equal to 60°C, ranging for example from 60°C to 120°C and/or monomers having a Tg between 20 and 40°C, as described above.
  • a Tg ranging from -100°C to 20°C preferably less than 15°C, in particular ranging
  • the block having a Tg less than or equal to 20°C is a homopolymer.
  • the principal monomers particularly preferred for the block having a Tg less than or equal to 20°C are alkyl acrylates whose alkyl chain comprises from 1 to 10 carbon atoms, with the exception of the tert-butyl group, such as methyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate and mixtures thereof.
  • C) Block having a Tg between 20 and 40°C The block which has a Tg between 20 and 40°C may be a homopolymer or a copolymer. In the case where this block is a homopolymer, it is derived from monomers (or principal monomer) which are such that the homopolymers prepared from these monomers have glass transition temperatures between 20 and 40°C.
  • This first block may be a homopolymer, consisting of a single type of monomer (for which the Tg of the corresponding homopolymer ranges from 20°C to 40°C) .
  • the monomers whose homopolymer has a glass transition temperature between 20 and 40°C are preferably chosen from n-butyl methacrylate, cyclodecyl acrylate, neopentyl acrylate, isodecylacrylamide and mixtures thereof.
  • the block having a Tg between 20 and 40°C is a copolymer, it is derived totally or partly from one or more monomers (or principal monomer) , the nature and concentration of which are chosen so that the Tg of the resulting copolymer is between 20 and 40°C.
  • the block having a Tg between 20 and 40°C is a copolymer derived totally or partly: from principal monomers for which the corresponding homopolymer has a Tg greater than or equal to 40°C, for example a Tg ranging from 40°C to 150°C, preferably greater than or equal to 50°C, ranging for example from 50 to 120°C, and even better greater than or equal to 60°C, ranging for example from 60°C to 120°C, as described above, and/or principal monomers whose corresponding homopolymer has a Tg less than or equal to 20°C, for example a Tg ranging from -100 to 20°C, preferably less than or equal to 15°C, in particular ranging from -80°C to 15°C and even better less than or equal to 10°C, for example ranging from -50°C to 0°C, as described above, the said monomers being chosen such that the Tg of the copolymer forming the first block is between 20 and 40°C.
  • Such principal monomers are for example chosen from methyl methacrylate, isobornyl acrylate and methacrylate, butyl acrylate, 2-ethylhexyl acrylate and mixtures thereof.
  • Each of the first and/or the second block may comprise, in addition to the monomers indicated above, one or more other monomers called additional monomers, different from the principal monomers cited above. The nature and quantity of this or these additional monomers are chosen such that the block in which they are present has the desired glass transition temperature .
  • each of the first and second blocks comprises at least one monomer chosen from acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters and mixtures thereof.
  • the polymer according to the invention does not comprise styrene or styrene derivatives such as for example methylstyrene, chlorostyrene or chloromethylstyrene.
  • Each of the blocks may nevertheless contain in a minor proportion at least one monomer constituting the other block.
  • the first block may contain at least one monomer constituting the second block and conversely.
  • the polymer according to the invention is a non-silicon polymer, that is to say a polymer free of silicon atoms .
  • This or these additional monomer (s) generally represent (s) a quantity less than or equal to 30% by weight, for example from 1 to 30% by weight, preferably from 5 to 20% by weight, and preferably still from 7 to 15% by weight of the total weight of the first and/or second blocks.
  • the polymer according to the invention may be obtained by free-radical polymerization in solution according to the following method of preparation: a portion of the polymerization solvent is introduced into a suitable reactor and heated until the temperature appropriate for polymerization (typically between 60 and 120°C) is reached, once this temperature has been reached, the monomers constituting the first block are introduced in the presence of a portion of the polymerization initiator, after a time T corresponding to a maximum conversion rate of 90%, the monomers constituting the second block and the other portion of the initiator are introduced, - the mixture is allowed to react for a time T' (ranging from 3 to 6 h) after which the mixture is brought to room temperature, the polymer is obtained in solution in the polymerization solvent.
  • T' ranging from 3 to 6 h
  • the expression polymerization solvent is understood to mean a solvent or a mixture of solvents.
  • the polymerization solvent may be chosen in particular from ethyl acetate, butyl acetate, alcohols such as isopropanol, ethanol, aliphatic alkanes such as isododecane and mixtures thereof.
  • the polymerization solvent is a mixture of butyl acetate and isopropanol or isododecane.
  • the polymer according to the invention comprises a first block having a Tg greater than or equal to 40°C, as described above in a) and a second block having a Tg less than or equal to 20°C, as described above in b) .
  • the first block having a Tg greater than or equal to 40°C is a copolymer derived from monomers which are such that the homopolymer prepared from these monomers has a glass transition temperature of greater than or equal to 40°C, such as the monomers described above.
  • the second block having a Tg less than or equal to 20°C is a homopolymer derived from monomers which are such that the homopolymer prepared from these monomers has a glass transition temperature less than or equal to 20°C, such as the monomers described above.
  • the proportion of the block having a Tg greater than or equal to 40°C ranges from 20 to 90% by weight of the polymer, even better from 30 to 80% and better still from 50 to 70%.
  • the proportion of the block having a Tg less than or equal to 20°C ranges from 5 to 75% by weight of the polymer, preferably from 15 to 50% and even better from 25 to 45%.
  • the polymer according to the invention comprises a first block having a glass transition temperature (Tg) between 20 and 40°C, in conformity with the blocks described in c) and a second block having a glass transition temperature less than or equal to 20°C, as described above in b) or a glass transition temperature greater than or equal to 40°C, as described in a) above.
  • the proportion of the first block having a Tg between 20 and 40°C ranges from 10 to 85% by weight of the polymer, even better from 30 to 80% and better still from 50 to 70%.
  • the second block is a block having a Tg greater than or equal to 40°C, it is preferably present in a proportion ranging from 10 to 85% by weight of the polymer, even better from 20 to 70% and better still from 30 to 70%.
  • the second block is a block having a Tg less than or equal to 20°C, it is preferably present in a proportion ranging from 10 to 85% by weight of the polymer, even better from 20 to 70% and better still from 20 to 50%.
  • the first block having a Tg between 20 and 40°C is a copolymer derived from monomers which are such that the corresponding homopolymer has a Tg greater than or equal to 40°C and monomers which are such that the corresponding homopolymer has a Tg less than or equal to 20°C.
  • the second block having a Tg less than or equal to 20°C or having a Tg greater than or equal to 40°C is a homopolymer.
  • the polymers which are particularly preferred according to the invention comprise: a first block having a Tg greater than or equal to 40°C, for example ranging from 85 to 115°C, which is an isobornyl acrylate/methyl methacrylate copolymer, a second block having a Tg less than or equal to 20°C, for example ranging from -85 to -55°C, which is a 2-ethylhexyl acrylate homopolymer, and an intermediate block which is an isobornyl acrylate/methyl methacrylate/2-ethylhexyl acrylate random copolymer.
  • a polymer comprising a first poly(isobornyl acrylate/isobutyl methacrylate) block having a Tg of 80°C, a second poly(2-ethylhexyl acrylate) block having a Tg of -70°C and an intermediate block which is an isobornyl acrylate/isobutyl methacrylate/2-ethylhexyl acrylate random polymer.
  • This polymer has a weight-average mass of 77 000 and a number-average mass of 19 000, that is a polydispersity value V of 4.05.
  • compositions contain from 0.1 to 60% by weight of active material (or dry matter) of the polymer according to the invention, preferably from 0.5 to 50% by weight, and preferably still from 1 to 40% by weight relative to the total weight of the composition.
  • the physiologically acceptable medium for the compositions according to the invention generally comprises a continuous aqueous phase and at least one organic solven .
  • the organic solvent may be hydrophilic.
  • the hydrophilic organic solvent (s) are chosen for example from alcohols and in particular linear or branched low monoalcohols having from 2 to 5 carbon atoms such as ethanol, isopropanol or n-propanol, and polyols such as glycerine, diglycerine, propylene glycol, sorbitol, penthylene glycol, and polyethylene glycols, or alternatively C 2 ethers and hydrophilic C 2 -C 4 aldehydes.
  • the lipophilic organic solvent (s) are chosen from oils and may constitute a fatty phase.
  • the physiologically acceptable medium for the compositions according to the invention may generally comprise a fatty phase consisting of at least one oil.
  • oils which may enter into the composition of the fatty phase there may be mentioned in particular: - mineral oils such as paraffin oil and liquid paraffin, - oils of animal origin, such as perhydrosqualene, - oils of plant origin, such as sweet almond oil, avocado oil, castor oil, olive oil, jojoba oil, sesame oil, groundnut oil, grape seed oil, rapeseed oil, copra oil, hazelnut oil, shea butter, palm oil, apricot kernel oil, calophyllum oil, rice bran oil, maize germ oil, wheat germ oil, soya bean oil, sunflower oil, evening primrose oil, safflower oil, passion flower oil and rye oil, - synthetic oils, such as purcellin oil, esters, such as for example butyl myristate, isopropyl myristate, cetyl myristate, isopropyl palmitate, isopropyl adipate, ethylhexyl adipate,
  • oils which can be used in the compositions according to the invention there may also be mentioned C 12 -C 1 5 fatty alcohol benzoates (Finsolv TN from FINETEX), ethers, lipophilic derivatives of amino acid such as isopropyl N-lauroylsarcosinate (Eldew SL-205 from Ajinomoto) , fatty alcohols such as lauryl, cetyl, myristyl, stearyl, palmityl or oleyl alcohol and 2-octyldodecanol, acetylglycerides, octanoates and decanoates of alcohols and polyalcohols such as those of glycol and of glycerol, ricinoleates of alcohols and of polyalcohols such as those of cetyl, fatty acid triglycerides such as caprylic/capric triglycerides, C10-C18 saturated fatty acid triglycerides, fluorinated and
  • the fatty phase may also contain one or more conventional lipophilic cosmetic adjuvants, such as for example waxes, lipophilic gelling agents, surfactants, organic or inorganic particles, and in particular those which are already customarily used in the manufacture and production of anti-sun cosmetic compositions .
  • the expression wax is understood to mean a compound which is solid or substantially solid at room temperature, and whose melting point is generally greater than 35°C.
  • wax compounds there may be mentioned paraffin, carnauba wax, beeswax, hydrogenated castor oil.
  • the compositions in accordance with the invention contain at least one photoprotective system capable of screening out UV radiation.
  • UV-screening agents may contain one or more organic or inorganic UV-screening agents which are active in UVA and/or UVB, water-soluble or fat-soluble or insoluble in commonly used cosmetic solvents.
  • the organic UV-screening agents are chosen in particular from anthranilates; cinnamic derivatives; dibenzoylmethane derivatives; salicylic derivatives, camphor derivatives; triazine derivatives such as those described in Patent Applications US 4367390, EP 863145, EP 517104, EP 570838, EP 796851, EP 775698, EP 878469, EP 933376, EP 507691, EP 507692, EP 790243 and EP 944624; benzophenone derivatives; ⁇ , ⁇ ' -diphenyl acrylate derivatives; benzotriazole derivatives; benzalmalonate derivatives; benzimidazole derivatives; imidazolines ; bis-benzoazolyl derivatives as described in Patents EP 6693
  • Ethylhexyl Dimethyl PABA sold in particular under the name "ESCALOL 507" by ISP, Glyceryl PABA,
  • Cinnamic derivatives Cinnamic derivatives :
  • Ethylhexyl Methoxycinnamate sold in particular under the trade name "PARSOL MCX" by HOFFMANN LA ROCHE,
  • Etocrylene sold in particular under the trade name
  • UVINUL N35 by BASF, Benzophenone derivatives :
  • UVINUL 400 Benzophenone-1 sold under the trade name "UVINUL 400" by BASF,
  • Benzophenone-2 sold under the trade name "UVINUL D50" by BASF
  • Benzophenone-3 or Oxybenzone sold under the trade name
  • Benzophenone-4 sold under the trade name "UVINUL MS40" by BASF,
  • Benzophenone-5 Benzophenone-6 sold under the trade name "Helisorb 11" by Norquay,
  • Benzophenone-8 sold under the trade name "Spectra-Sorb
  • Benzophenone-9 sold under the trade name "UVINUL DS-49" by BASF,
  • Phenylbenzimidazole derivatives Phenylbenzimidazole Sulphonic Acid sold in particular under the trade name "EUSOLEX 232" by MERCK,
  • Ethylhexyl triazone sold in particular under the trade name "UVINUL T150" by BASF, Diethylhexyl Butamido Triazone sold under the trade name "UVASORB HEB” by SIGMA 3V,
  • Benzalmalonate derivatives Polyorganosiloxanes with benzalmalonate functional groups such as Polysilicone-15 sold under the trade name "PARSOL SLX" by HOFFMANN LA ROCHE
  • the additional inorganic photoprotective agents are chosen from pigments and still more preferably nanopigments (mean size of the primary particles: generally between 5 nm and 100 nm, preferably between 10 nm and 50 nm) of metal oxides which are treated or not, such as for example nanopigments of titanium oxide (amorphous or crystallized in the form of rutile and/or anatase) , iron oxide, zinc oxide, zirconium oxide or cerium oxide.
  • the treated nanopigments are pigments which have undergone one or more surface treatments of a chemical, electronic, mechanochemical and/or mechanical nature with compounds as described for example in
  • the treated nanopigments may be more particularly titanium oxides treated with: silica and alumina, such as the products
  • Dioxide MT 100 SA from the company TAYCA
  • the products "Tioveil Fin”, “Tioveil OP”, “ Tioveil MOTG” and “Tioveil IPM” from the company TIOXIDE alumina and aluminium stearate, such as the product "Microtitanium Dioxide MT 100 T” from the company TAYCA, - alumina and aluminium laurate, such as the product
  • iron oxides and iron stearate such as the product "Microtitanium Dioxide MT 100 F” from the company TAYCA
  • silica, alumina and silicone such as the products "Microtitanium Dioxide MT 100 SAS", “Microtitanium Dioxide MT 600 SAS” and “Microtitanium Dioxide MT 500 SAS” from the company TAYCA
  • sodium hexametaphosphate such as the product "Microtitanium Dioxide MT 150 W” from the company TAYCA
  • octyltrimethoxysilane such as the product "T-805" from the company DEGUSSA
  • alumina and stearic acid such as the product "UVT-M160” from the company KEMIRA, - alumina and glycerine, such as the product "UVT-M212" from the company KEMIRA, alumina and silicone, such as the product "UVT-M262" from the company KEMIRA.
  • titanium oxide nanopigments treated with a silicone are preferably Ti0 2 treated with octyltrimethylsilane and whose average elementary particle size is between 25 and 40 nm, such as that sold under the trade name "T 805" by the company DEGUSSA SILICES, Ti0 2 treated with a polydimethylsiloxane and whose average elementary particle size is 21 nm, such as that sold under the trade name "70250 CARDRE UF Ti02S13" by the company CARDRE, Ti0 2 anatase/rutile treated with a polydimethylhydrogenosiloxane and whose average elementary particle size is 25 nm, such as that sold under the trade name "MICRO TITANIUM DIOXYDE USP GRADE HYDROPHOBIC" by the company COLOR TECHNIQUES.
  • the uncoated titanium oxide nanopigments are for example sold by the company TAYCA under the trade names "MICROTITANIUM DIOXIDE MT 500 B” or “MICROTITANIUM DIOXIDE MT600 B” by the company DEGUSSA under the name "P 25", by the company WACKHER under the name “transparent titanium oxide PW” , by the company MIYOSHI KASEI under the name “UFTR” , by the company TOMEN under the name "ITS” and by the company TIOXIDE under the name "TIOVEIL AQ” .
  • the uncoated zinc oxide nanopigments are for example
  • coated zinc oxide nanopigments are for example - those marketed under the name "OXIDE ZINC CS-5" by the company Toshibi (ZnO coated with polymethylhydrogenosiloxane) ; - those marketed under the name "NAN0GARD ZINC OXIDE FN" by the company NANOPHASE TECHNOLOGIES (as a 40% dispersion in Finsolv TN, C ⁇ -C ⁇ 5 alcohol benzoate) ;
  • the uncoated iron oxide nanopigments are for example sold by the company ARNAUD under the names "NANOGARD WCD 2002 (FE 45B) " , “NANOGARD IRON FE 45 BL AQ”, “NANOGARD FE 45R AQ” , “NANOGARD WCD 2006 (FE 45R) " or by the company MITSUBISHI under the name “TY-220” .
  • coated iron oxide nanopigments are for example sold by the company ARNAUD under the names "NANOGARD WCD 2008 (FE 45B FN) " , “NANOGARD WCD 2009 (FE 45B 556)", “NANOGARD FE 45 BL 345", “NANOGARD FE 45 BL” , or by the company BASF under the name “TRANSPARENT IRON OXIDE” .
  • metal oxides in particular of titanium dioxide and of cerium dioxide, including the equiponderous mixture of titanium dioxide and of cerium dioxide coated with silica, sold by the company IKEDA under the name
  • compositions according to the invention may be introduced into the compositions according to the invention as they are or in the form of a pigmentary paste, that is to say as a mixture with a dispersant, as described for example in the document GB-A 2206339.
  • the additional photoprotective agents are generally present in the compositions according to the invention in proportions ranging from 0.01 to 20% by weight relative to the total weight of the composition, and preferably ranging from 0.1 to 10% by weight relative to the total weight of the composition.
  • the compositions according to the invention may also contain agents for artificially tanning and/or bronzing the skin (self-tanning agents), and more particularly dihydroxyacetone (DHA) . They are preferably present in quantities ranging from 0.1 to 10% by weight relative to the total weight of the composition.
  • compositions in accordance with the present invention may additionally comprise conventional cosmetic adjuvants chosen in particular from fatty substances, organic solvents, hydrophilic or lipophilic, ionic or nonionic thickeners, demulcents, humectants, opacifiers, stabilizers, emollients, silicones, antifoaming agents, perfumes, preservatives, anionic, cationic, nonionic, zwitterionic or amphoteric surfactants, active agents, fillers, polymers, propellants, alkalinizing or acidifying agents or any other ingredient normally used in the cosmetic and/or dermatological field.
  • the fatty substances may consist of an oil or a wax or mixtures thereof.
  • the expression oil is understood to mean a compound which is liquid at room temperature.
  • the expression wax is understood to mean a compound which is solid or substantially solid at room temperature, and whose melting point is generally greater than 35°C.
  • oils there may be mentioned mineral oils
  • paraffin paraffin
  • vegetable oils sweet almond, macadamia, blackcurrant seed or jojoba oil
  • synthetic oils such as perhydrosqualene, alcohols, fatty acids or esters (such as C12-C15 alcohol benzoate sold under the trade name "Finsolv TN" by the company WITCO, octyl palmitate, isopropyl lanolate, triglycerides including those of capric/caprylic acids) , oxyethylenated or oxypropylenated fatty esters and ethers
  • silicone oils cyclomethicone, polydimethylsiloxanes or PDMS) or fluorinated oils, polyalkylenes .
  • waxy compounds there may be mentioned paraffin, carnauba wax, beeswax, hydrogenated castor oil.
  • organic solvents there may be mentioned low alcohols and polyols.
  • the latter may be chosen from glycols and glycol ethers such as ethylene glycol, propylene glycol, butylene glycol, dipropylene glycol or diethylene glycol .
  • carboxyvinyl polymers such as carbopols (carbomers) and Pemulen (acrylate/C10-C30 alkyl acrylate copolymer)
  • polyacrylamides such as for example crosslinked copolymers sold under the names Sepigel 305 (CTFA name: polyacrylamide/Cl3-14 isoparaffin/laureth 7) or Simulgel 600 (CTFA name: acrylamide/sodium acryloyldimethyltaurate copolymer/isohexadecane/polysorbate 80) by the company Seppic
  • modified clays such as hectorite and its derivatives, such as the products marketed under the names Bentone .
  • active agents there may be mentioned: antipollution agents and/or anti-free-radical agents ; depigmenting agents and/or propigmenting agents; antiglycation agents; - NO-synthase inhibitors; agents stimulating the synthesis of dermal or epidermal macromolecules and/or preventing their degradation; agents stimulating the proliferation of the fibroblasts; agents stimulating the proliferation of the keratinocytes ; muscle relaxants; tightening agents; - desquamating agents; moisturizing agents; anti-inflammatory agents; agents acting on the energy metabolism of the cells; - insect repellents; antagonists of substance P or of CRGP.
  • the continuous aqueous phase-based compositions according to the invention may be provided in the form of a lotion or a serum; in the form of aqueous suspensions; in the form of an aqueous gel; in the form of a simple oil/water emulsion or a complex
  • W/O/W emulsion such as a milk, a cream or a gel cream. They may be optionally packaged as an aerosol and may be provided in the form of a mousse or a spray.
  • compositions according to the invention are provided in the form of an oil-in-water emulsion.
  • the emulsions according to the invention generally contain at least one emulsifier chosen from amphoteric, anionic, cationic or nonionic emulsifiers, used alone or as a mixture.
  • nonionic emulsifiers such as oxyalkylenated (more particularly polyoxyethylenated) fatty acid esters of glycerol; oxyalkylenated fatty acid esters of sorbitan; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty acid esters; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty alcohol ethers; sugar esters such as sucrose stearate; fatty alcohol ethers of sugars, in particular alkyl polyglucosides (APG) such as decyl glucoside and lauryl glucoside marketed for example by the company Henkel under the respective names Plantaren 2000 and Plantaren 1200, ketostearyl glucoside optionally as a mixture with ketostearyl alcohol, marketed for example under the name Montanov 68 by the company Seppic
  • the alkyl polyglucoside mixture as defined above with the corresponding fatty alcohol may be in the form of a self-emulsifying composition, as described for example in the document WO-A-92/06778.
  • the emulsion according to the invention may also be stabilized: - with gelling and/or thickening agents such as aqueous dispersions as described in Patents EP683661 and EP787483. or with inorganic or organic fillers of less than 200 nm in size, having an amphiphilic character, such as emulsions of the Pickering type as described in Patent Applications EP987001, EP987002, EP987003, EP987004, EP987005, EP986006.
  • the aqueous phase thereof may comprise a nonionic vesicular dispersion prepared according to known methods (Bangham, Standish and Watkins, J. Mol. Biol. 13, 238 (1965), FR 2 315 991 and FR 2 416 008) .
  • the cosmetic composition according to the invention is used as a product for photoprotecting the skin, it may be provided in the form of a lotion or a serum; in the form of an aqueous gel; in the form of an oil-in-water emulsion such as a cream, of a milk or of a gel cream; of a nonionic vesicular dispersion; or in the form of a stick.
  • compositions according to the invention find application in a large number of treatments, in particular cosmetic treatments, of the skin, the lips and the hair, including the scalp, in particular for the protection and/or care of the skin, the lips and/or the hair, and/or for making up the skin and/or the lips .
  • Another subject of the present invention consists in the use of the compositions according to the invention as defined above for the manufacture of products for the cosmetic treatment of the skin, the lips, the nails, the hair, the eyelashes, the eyebrows and/or the scalp, in particular care products and make-up products .
  • compositions according to the invention may for example be used as care and/or sun protection product for the face and/or the body, having a liquid to semiliquid consistency, such as milks, creams which are more or less unctuous, gel creams and pastes. They may be optionally packaged as an aerosol and may be provided in the form of a mousse or a spray.
  • the compositions according to the invention in the form of vaporizable fluid lotions in accordance with the invention are applied to the skin or the hair in the form of fine particles by means of pressurized devices.
  • the devices in accordance with the invention are well known to a person skilled in the art and comprise non aerosol pumps or "atomizers", aerosol containers comprising a propellant and aerosol pumps using compressed air as propellant.
  • compositions packaged as an aerosol in accordance with the invention generally contain conventional propellants such as for example hydrofluorinated compounds, dichlorodifluoromethane, difluoroethane, dimethyl ether, isobutane, n-butane, propane, trichlorofluoromethane. They are preferably present in quantities ranging from 15 to 50% by weight relative to the total weight of the composition. Concrete examples, but which are not at all limiting, illustrating the invention will now be given.
  • Example 1 Preparation of a poly (methyl methacrylate/acrylic acid/methyl acrylate) polymer 100 g of butyl acetate are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour.
  • a polymer which comprises a first poly (methyl methacrylate/acrylic acid) block having a Tg of 100°C, a second poly (methyl acrylate) block having a Tg of 10°C and an intermediate block which is a methyl methacrylate/acrylic acid/poly (methyl acrylate) random polymer.
  • This polymer has a weight-average mass of 52 000 and a number-average mass of 18 000, that is a polydispersity value V of 2.89.
  • Ex.ample 2 Preparation of a poly (methyl methacrylate/acrylic acid/methyl acrylate) polymer 100 g of butyl acetate are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour. 150 g of methyl methacrylate, 30 g of acrylic acid, 30 g of methyl acrylate, 40 g of butyl acetate, 70 g of isopropanol and 1.8 g of 2, 5-bis (2- ethylhexanoylperoxy) -2 , 5-dimethylhexane (Trigonox® 141 from Akzo Nobel) are then added, at 90°C and over 1 hour.
  • Trigonox® 141 from Akzo Nobel
  • the mixture is kept for 1 hour at 90°C.
  • 90 g of methyl acrylate, 70 g of butyl acetate, 20 g of isopropanol and 1.2 g of 2, 5-bis (2- ethylhexanoylperoxy) -2 , 5-dimethylhexane are then introduced into the preceding mixture, still at 90°C and over 1 hour.
  • the mixture is kept for 3 hours at 0°C, and then diluted with 105 g of butyl acetate and 45 g of isopropanol, and then the whole is cooled.
  • a solution containing 40% of active material as polymer is obtained in the butyl acetate/isopropanol mixture.
  • a polymer which comprises a first poly(acrylic acid/methyl acrylate) block having a Tg of 80°C, a second poly (methyl acrylate) block having a Tg of 10°C and an intermediate block which is an acrylic acid/methyl acrylate/poly (methyl acrylate) random polymer.
  • This polymer has a weight-average mass of 50 000 and a number-average mass of 17 000, that is a polydispersity value V of 2.95.
  • Example 3 Preparation of a poly (acrylic acid/methyl acrylate/poly (methyl acrylate) /tri luoroethyl methacrylate) polymer 100 g of butyl acetate are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour.
  • a polymer which comprises a first poly (acrylic acid/methyl methacrylate/trifluoroethyl methacrylate) block having a Tg of 85°C, a second poly (methyl acrylate) block having a Tg of 10°C and an intermediate block which is an acrylic acid/methyl acrylate/poly (methyl acrylate) /trifluoroethyl methacrylate random polymer.
  • This polymer has a weight- average mass of 53 000 and a number-average mass of 17 500, that is a polydispersity value V of 3.03.
  • Ex.ample 4 Preparation of a poly (isobornyl acrylate/isobutyl methacrylate/2-ethylhexyl acrylate) polymer 100 g of isododecane are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour.
  • a polymer which comprises a first poly (isobornyl acrylate/isobutyl methacrylate) block having a Tg of 80°C, a second poly (2-ethylhexyl acrylate) block having a Tg of -70°C and an intermediate block which is an isobornyl acrylate/isobutyl methacrylate/2-ethylhexyl acrylate random polymer.
  • This polymer has a weight-average mass of 77 000 and a number-average mass of 19 000, that is a polydispersity value V of 4.05.
  • Example 5 Preparation of a poly (isobornyl acrylate/methyl methacrylate/2-ethylhexyl acrylate) polymer 100 g of isododecane are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour. 150 g of isobornyl acrylate, 60 g of methyl methacrylate, 110 g of isododecane and 1.8 g of 2,5- bis (2-ethylhexanoylperoxy) -2 , 5-dimethylhexane (Trigonox® 141 from Akzo Nobel) are then added, at 90°C and over 1 hour.
  • the mixture is kept for 1 h 30 min at 90°C.
  • 90 g of 2-ethylhexyl acrylate, 90 g of isododecane and 1.2 g of 2 , 5-bis (2-ethylhexanoyl- peroxy) -2 , 5-dimethylhexane are then introduced into the preceding mixture, still at 90°C and over 30 minutes.
  • the mixture is kept for 3 hours at 90°C, and then the whole is cooled.
  • a solution containing 50% of active material as polymer is obtained in isododecane.
  • a polymer which comprises a first poly (isobornyl acrylate/methyl methacrylate) block having a Tg of 100°C, a second poly (2-ethylhexyl acrylate) block having a Tg of -70°C and an intermediate block which is an isobornyl acrylate/methyl methacrylate/2-ethylhexyl acrylate random polymer.
  • This polymer has a weight-average mass of 76 500 and a number-average mass of 22 000, that is a polydispersity value V of 3.48.
  • a polymer which comprises a first poly(isobornyl acrylate/methyl methacrylate) block having a Tg of 100°C, a second poly (2-ethylhexyl acrylate) block having a Tg of -70°C and an intermediate block which is an isobornyl acrylate/methyl methacrylate/2-ethylhexyl acrylate random polymer.
  • This polymer has a weight-average mass of 76 500 and a number-average mass of 22 000, that is a polydispersity value V of 3.48.
  • Example 7 Preparation of a poly (isobornyl acrylate/isobutyl methacrylate/isobutyl acrylate) polymer 100 g of isododecane are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour. 120 g of isobornyl acrylate, 90 g of isobutyl methacrylate, 110 g of isododecane and 1.8 g of 2,5- bis (2-ethylhexanoylperoxy) -2, 5-dimethylhexane (Trigonox® 141 from Akzo Nobel) are then added, at 90°C and over 1 hour.
  • the mixture is kept for 1 h 30 min at 90°C.
  • 90 g of isobutyl acrylate, 90 g of isododecane and 1.2 g of 2 , 5-bis (2-ethylhexanoyl- peroxy) -2 , 5-dimethylhexane are then introduced into the preceding mixture, still at 90°C and over 30 minutes.
  • the mixture is kept for 3 hours at 90°C, and then the whole is cooled.
  • a solution containing 50% of active material as polymer is obtained in isododecane.
  • a polymer which comprises a first poly (isobornyl acrylate/isobutyl methacrylate) block having a Tg of 75°C, a second poly (isobutyl acrylate) block having a Tg of -20°C and an intermediate block which is an isobornyl acrylate/isobutyl methacrylate/isobutyl acrylate random polymer.
  • This polymer has a weight-average mass of 144 200 and a number-average mass of 49 300, that is a polydispersity value V of 2.93.
  • a polymer which comprises a first poly (butyl methacrylate) block having a Tg of 25°C, a second poly (butyl acrylate) block having a Tg of -50°C and an intermediate block which is a butyl methacrylate/butyl acrylate random polymer.
  • This polymer has a weight-average mass of 57 560 and a number-average mass of 19 025, that is a polydispersity value V of 3.03.
  • Example 9 Preparation of a poly (methylmethacrylate/methyl acrylate/acrylic acid) polymer 100 g of butyl acetate are introduced into a
  • the polymer obtained comprises a first poly (methyl acrylate/methyl methacrylate/acrylic acid) block having a Tg of 35°C, a second poly (methyl methacrylate) block having a Tg of 100°C and an intermediate block which is a methyl methacrylate/acrylic acid/poly (methyl acrylate) random polymer.
  • Example 10 Preparation of a poly (isobornyl acrylate/isobutyl methacrylate/2-ethylhexyl acrylate) polymer 100 g of isododecane are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour.
  • the polymer obtained comprises a first poly (isobornyl acrylate/isobutyl methacrylate/2-ethyl- hexyl acrylate) block having a Tg of 35°C, a second poly (2-ethylhexyl acrylate) block having a Tg of -50°C and an intermediate block which is an isobornyl acrylate/isobutyl methacrylate/2-ethylhexyl acrylate random polymer.
  • Example 11 Preparation of a poly (isobornyl acrylate/isobutyl methacrylate/2-ethylhexyl acrylate) polymer 100 g of isododecane are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour.
  • a polymer which comprises a first poly (isobornyl acrylate/isobutyl methacrylate/2-ethyl- hexyl acrylate) block having a Tg of 25°C, a second poly (2-ethylhexyl acrylate) block having a Tg of -50°C and an intermediate block which is an isobornyl acrylate/isobutyl methacrylate/2-ethylhexyl acrylate random polymer.
  • Example 12 Preparation of a poly (isobornyl acrylate/acrylic acid/methyl acrylate) polymer 100 g of isododecane are introduced into a 1 litre reactor, and then the temperature is increased so as to pass from room temperature (25°C) to 90°C over 1 hour. 210 g of isobornyl acrylate, 110 g of isododecane and 1.8 g of 2 , 5-bis (2-ethyl- hexanoylperoxy) -2, 5-dimethylhexane (Trigonox® 141 from Akzo Nobel) are then added, at 90°C and over 1 hour. The mixture is kept for 1 h 30 min at 90°C.
  • a polymer which comprises a first poly (isobornyl acrylate/methyl acrylate/acrylic acid) block having a Tg of 25°C, a second poly (isobornyl acrylate) block having a Tg of 100°C and an intermediate block which is an isobornyl acrylate/methyl acrylate/acrylic acid random polymer.
  • Example 13 Preparation of a poly (methyl methacrylate/methyl acrylate/acrylic acid) polymer 210 g of ethyl acetate are introduced into a
  • the polymer obtained comprises a first poly (methyl acrylate/methyl methacrylate/acrylic acid) block having a Tg of 35°C, a second poly (methyl methacrylate) block having a Tg of 100°C and an intermediate block which is a methyl methacrylate/acrylic acid/poly (methyl acrylate) random polymer.
  • This polymer has a weight-average mass of
  • Examples A and B of an anti-sun composition The following two oil/water emulsions were prepared and compared.
  • the sun protection factor (SPF) attached thereto is then determined. It was determined using the in vitro method described by B. L. DIFFEY et al . in J. Soc. Cosmet . Chem. 40-127-133 (1989); this method consists in determining the monochromatic protection factors every 5 nm in a wavelength range from 290 to 400 nm and in calculating therefrom the sun protection factor according to a given mathematical equation.
  • Example B additionally comprising the polymer of Example 4 makes it possible to increase the sun protection factor by about 30% compared with that of Example A.

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Abstract

La présente invention a trait à des compositions de photoprotection, caractérisées en ce qu'elles comportent, dans un support physiologiquement acceptable à base de phase aqueuse continue : (a) au moins un système de photoprotection capable de constituer un écran de protection contre le rayonnement ultraviolet ; (b) au moins un polymère séquencé comportant au moins un premier bloc et au moins un deuxième bloc qui sont mutuellement incompatibles et qui ont des températures de transition vitreuse (Tg) différentes, lesdits premier et deuxième blocs étant liés l'un à l'autre par un segment intermédiaire comprenant au moins un monomère constituant le premier bloc et au moins un monomère constituant le deuxième bloc et ledit polymère présentant une valeur de polydispersité V supérieure ou égale à 2. L'invention a également trait à l'utilisation d'un polymère séquencé tel que décrit plus haut dans une composition de photoprotection comportant, dans un support physiologiquement acceptable à base de phase aqueuse continue, au moins un système de photoprotection capable de constituer un écran de protection contre le rayonnement ultraviolet, comme agent permettant l'amélioration du facteur de protection solaire (FPS) de ladite composition.
PCT/EP2004/010989 2003-09-26 2004-09-15 Composition de photoprotection a base de phase aqueuse continue contenant un polymere comportant au moins de blocs mutuellement incompatibles et ayant differentes temperatures de transition vitreuse WO2005030155A1 (fr)

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Publication number Priority date Publication date Assignee Title
FR2995785A1 (fr) * 2012-09-27 2014-03-28 Oreal Emulsion huile-dans-eau anti-transpirante comprenant un sel ou complexe anti-transpirant d'aluminium et/ou de zirconium et un polymere ethylenique filmogene non hydrosoluble et sequence
WO2014048648A1 (fr) * 2012-09-27 2014-04-03 L'oreal Émulsion antiperspirante huile-dans-eau, comprenant un sel ou complexe antiperspirant d'aluminium et/ou de zirconium et un polymère éthylénique filmogène séquencé insoluble dans l'eau
EP3233052A4 (fr) * 2014-12-18 2018-09-05 L'oreal Compositions et procédés de protection solaire
US10864157B2 (en) 2014-12-18 2020-12-15 L'oreal Compositions and methods for improving the appearance of the skin
US11382855B2 (en) 2014-12-18 2022-07-12 L'oreal Compositions and methods for improving the appearance of the skin
US10835479B2 (en) 2015-12-31 2020-11-17 L'oreal Systems and methods for improving the appearance of the skin
CN112261932A (zh) * 2018-06-13 2021-01-22 诺力昂化学品国际有限公司 包含增稠有机液体的个人护理配制剂

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