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according to the invention, the coated or uncoated nanopigments of titanium oxide are particularly preferred. the fat-soluble hydrocarbon chain-containing screening polymers used according to the invention may be: a) polyethyleneimine, chitin or chitosan polymers with an optionally substituted polyethylenic structure on which are grafted ultraviolet radiation-absorbing molecules via an ester, amide, ether, thioether, sulfonyl or acyl functional group, b) polymers resulting from the homo- or copolymerization of ultraviolet radiation-absorbing molecules ("screening monomers") carrying an unsaturated group chosen from the radicals: allyl, vinyl, acrylamide, methacrylamide, vinyloxycarbonylmethyl, acrylamidoalkyl and especially acrylamidomethyl, methacrylamidoalkyl, acrylamido(phenyl)alkyl, methacrylamido(phenyl)alkyl, acryloyloxy, acryloyloxy-alkyl and acryloyloxypolyoxyethylene, optionally with other unsaturated monomers.
les polymères filtres à chaíne hydrocarbonée liposolubles utilisés selon l'invention peuvent être : a) des polymères à structure polyéthylénique éventuellement substituée, de polyéthylèneimine, de chitine ou de chitosane, sur lesquels sont greffées des molécules absorbant le rayonnement ultraviolet par l'intermédiaire d'une fonction ester, amide, éther, thioéther, sulfonyle ou acyle, b) des polymères résultant de l'homo- ou de la copolymérisation de molécules absorbant le rayonnement ultraviolet ("monomères filtres") portant un groupement insaturé choisi parmi les radicaux : allyle, vinyle, acrylamide méthacrylamide, vinyloxycarbonylméthyle, acrylamidoalkyle et notamment acrylamidométhyle, méthacrylamidoalkyle, acrylamido(phényl)alkyle, méthacrylamido(phényl) alkyle, acryloxy, acryloxyalkyle et acryloxypolyoxyéthylène, avec éventuellement d'autres monomères insaturés.
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