Process for the preparation of porous bodies

Details Process for the preparation of porous bodies Process for the preparation of porous bodies

C - Chemistry, Metallurgy

08

J

18/19

C08J 9/26 (2006.01) B01D 67/00 (2006.01) B01D 69/08 (2006.01) B01D 71/26 (2006.01) B29C 67/20 (2006.01) C08J 9/28 (2006.01)

Patent

CA 1231210

ABSTRACT "Process for the production of porous structures having an adjustable total pore volume, an adjustable pore size and an adjustable pore wall thickness" A process for the production of a porous structure having an adjustable total pore volume, an adjustable pore size and an adjustable pore wall thickness which comprises dissolving a polymer by heating beyond the upper critical temperature Tc in a mixture of two components A and B which are liquid and miscible at the dissolving temperature, the mixture of polymer and components A and B used having a miscibility gap in the liquid aggregate state, component A being a solvent for the polymer and component B increasing the phase separation temperature of a solution consisting of the polymer and component A, optionally forming the solution and causing it to dis- integrate and solidify by cooling and optionally extract- ing component(s) A and/or B is disclosed. It is one of the advantages of the present invention that, by using non-toxic substances, such as edible oils, for component A and castor oil or component B, it is possible to obtain structures, particularly membranes in the form of hollow fibres, which are non- toxic and which may be safely used, for example, in the medical field and in the food industry.

421158

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