Method for the production of hybrid spherical molded bodies...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 38/00 (2006.01) B01J 23/42 (2006.01) B01J 35/08 (2006.01) B01J 37/00 (2006.01) C04B 35/111 (2006.01) C04B 35/117 (2006.01) C04B 35/46 (2006.01) C04B 35/486 (2006.01) C04B 35/563 (2006.01) C04B 35/636 (2006.01)

Patent

CA 2485058

The invention relates to a method for producing hybrid spherical molded bodies from soluble polymers and at least one embedded additive. According to the inventive method, an additive-loaded polymer solution is dispersed in an inert solvent, said dispersion process being carried out at a reduced pressure. The resulting particle dispersion is cooled to a temperature lying below the solidification point of the polymer solution. The stabilized particles of the polymer solution are separated from the inert solvent. The separated particles of the polymer solution are precipitated in a solvent coagulating the polymer. The solvent-moistened polymer particles are dried until said particles are maximally condensed, and the resulting particles that are made of polymer and the additive are sintered by means of a thermal treatment so as to be turned into porous and/or highly condensed molded bodies. The inventive method makes it possible to obtain highly stable molded bodies which do not sinter together during the sintering process.

L'invention concerne un procédé pour produire des corps façonnés sphériques hybrides à partir de polymères solubles et d'au moins un additif interstitiel. Selon ce procédé, une solution polymère chargée d'un additif est dispersée dans un solvant inerte, ce processus de dispersion étant effectué à pression réduite. La dispersion de particules obtenue est refroidie à une température inférieure au point de solidification de la solution polymère. Les particules de la solution polymère stabilisées sont séparées du solvant inerte. Les particules de la solution polymère séparées sont précipitées dans un solvant faisant coaguler le polymère. Les particules polymères mouillées avec le solvant sont séchées jusqu'à compression maximale et les particules obtenues, composées du polymère et de l'additif, sont agglomérées par frittage par traitement thermique pour former des corps façonnés poreux et/ou à haut degré de compression. Ce procédé permet d'obtenir des corps façonnés particulièrement stables qui ne s'agglomèrent pas entre eux lors du processus de frittage.

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