Porous membrane, process for producing porous membrane,...

B - Operations – Transporting – 01 – D

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B01D 69/08 (2006.01) B01D 71/44 (2006.01) B01D 71/68 (2006.01) D01D 5/24 (2006.01)

Patent

CA 2732641

A porous membrane with the membrane wall constructed of a hydrophobic polymer and a hydrophilic polymer, wherein when the membrane wall is divided into 3 sections in the film thickness direction to form region "a" containing one wall surface A of the membrane wall, region "c" containing the other wall surface C and region "b" between region "a" and region "c", the hydrophilic polymer content ratio C a in region "a" is greater than the hydrophilic polymer content ratio C c in region "c", and the mean pore size of the wall surface C is larger than the mean pore size of the wall surface A.

La présente invention concerne une membrane poreuse qui a une paroi de membrane constituée par un polymère hydrophobe et un polymère hydrophile. Lorsque la paroi de la membrane est divisée en trois régions égales dans le sens de lépaisseur, c'est-à-dire, en une région (a) comprenant une surface de paroi (A), une région (c) comprenant lautre surface de paroi (C), et une région (b) entre la région (a) et la région(c), alors le contenu du polymère hydrophile dans la région (a), (Ca), est supérieur au contenu du polymère hydrophile dans la région (c), (Cc), et le diamètre moyen des pores de la surface de paroi (C) est plus grand que le diamètre moyen des pores de la surface de paroi (A).

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