Anti-uv nanoparticles
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsOlivier Poncelet, Olivier Renard
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Abstract
The invention relates to nanoparticles having a core that is fully or partially formed by at least one UV-absorbing organic compound in crystallized form and coated with an outer layer formed by at least one hydrophilic polymer, said UV-absorbing organic compound(s) and hydrophilic polymer(s) being associated in a weight ratio of organic compound(s) to hydrophilic polymer(s) varying between 0.2 and 0.4.
Claims19
-18. (canceled)
A nanoparticle comprising a core formed in all or part of at least one UV-absorbing organic compound, in crystalline form, coated with an outer layer formed of at least one hydrophilic polymer, said UV-absorbing organic compound(s) and hydrophilic polymer(s) being combined in an organic compound(s)/hydrophilic polymer(s) ratio by weight varying from 0.2 to 0.4, wherein said hydrophilic polymer is a polyvinyl alcohol or a polyacrylic acid having a molecular weight of greater than 20,000 g/mol.
A process for making a nanoparticle of claim 1, comprising:
- obtaining an organic phase comprising at least one UV-absorbing organic compound in the solute state;
- obtaining an aqueous phase comprising at least one hydrophilic polymer, wherein said hydrophilic polymer is a polyvinyl alcohol or a polyacrylic acid having a molecular weight of greater than 20,000 g/mol;
- adding the organic phase to the aqueous phase under conditions propitious to the formation of an emulsion, wherein the organic phase is dispersed in the aqueous phase, and wherein the emulsion includes at least one surfactant capable of stabilizing the emulsion;
- carrying out a thermal quenching of the emulsion thus obtained in order to form said nanoparticles;
- and
- isolating said nanoparticles,
- wherein the amounts of polymer(s) and organic compound(s) are adjusted in order for the nanoparticle to have an organic compound(s)/hydrophilic polymer(s) ratio by weight varying from 0.2 to 0.4.
A process for stabilizing a material with regard to UV degradation, comprising adding to the material or to a precursor of the material, at least one nanoparticle of claim 1 as an agent for absorbing ultraviolet light radiation, wherein addition of the nanoparticle to the material or precursor of the material stabilizes the material or precursor with regard to UV degredation.
A process for increasing the sun protection factor of a textile fiber, comprising immobilizing on the fiber at least one nanoparticle of claim 1, wherein immobilization of the nanopartile on the fiber increases the sun protection factor of the fiber.
Dependencies are inferred from the claim text.