Modified porous silica, process for its preparation and its...

C - Chemistry – Metallurgy – 09 – C

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C09C 1/28 (2006.01) A61K 8/25 (2006.01) C08K 9/04 (2006.01) C08K 9/08 (2006.01) C09C 1/30 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2234035

The invention relates to porous silicas, the pores of which are at least partially filled with polyamide resins. The silicas have a pore volume of between 0.4 and 2 ml/g, an absorption capacity measured in accordance with standard DIN ISO 787/V of between 100 and 350 g of oil/100 g of silica, an average particle diameter of between 0.5 and 150 µm modified by polyamide resins. These silicas can be obtained by solubilization of the polyamide monomer(s) in an aqueous or water/alcohol solution, addition of the porous silica in a quantity such that all of the solution is absorbed by the silica powder, elimination of the solvent, followed by polymerization of the polyamide resins. These silicas can be used as liquid paint additives, pigment and/or dye carriers, anti-blocking agents for folded or rolled olefin films and in cosmetic, pharmaceutical and/or dermatological preparations.

L'invention concerne des silices poreuses dont les pores sont au moins partiellement remplis avec des résines polyamides. Les silices ont un volume de pore compris entre 0,4 et 2 ml/g, un pouvoir d'absorbtion mesuré selon la norme DIN ISO 787/V compris entre 100 et 350 g d'huile/100 g de silice, un diamètre de particules moyen compris entre 0,5 et 150 µm modifié par des résines polyamides et ces silices peuvent être obtenues par solubilisation du ou des monomères de polyamide dans une solution aqueuse ou hydroalcoolique, ajout de la silice poreuse en quantité telle que toute la solution soit absorbée par la poudre de silice, élimination du solvant, puis polymérisation des résines polyamides. Ces silices sont utilisables comme additifs de peintures liquides, comme vecteurs de pigments et/ou colorants, comme agents anti-bloquant pour des films en matière oléfinique pliés ou enroulés et dans des préparations cosmétiques, pharmaceutiques et/ou dermatologiques.

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