Placing controlled porosity blockages in unwanted pore sizes...

Details Placing controlled porosity blockages in unwanted pore sizes... Placing controlled porosity blockages in unwanted pore sizes...

C - Chemistry, Metallurgy

08

J

18/32

C08J 9/28 (2006.01) C08J 9/40 (2006.01)

Patent

CA 1288563

ABSTRACT Pores that are smaller than or larger than a predetermined range of pore sizes in a porous membrane barrier are blocked with a controlled porosity blocking agent. The pores are first filled with a liquid so as to remove any air therein and then subjected to a transmembrane gas blow a pressure which will clear the larger pores of the liquid. The larger gas filled pores or the smaller liquid filled pores are then blocked by a blocking agent using a polymer-forming chemical reaction, a precipitate-forming chemical reaction or the physical deposition of solids.

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