Microporous asymmetric polyamide membranes

Details Microporous asymmetric polyamide membranes Microporous asymmetric polyamide membranes

B - Operations, Transporting

01

D

117/88.5

B01D 71/56 (2006.01) B01D 67/00 (2006.01) B01D 69/10 (2006.01) B01D 69/12 (2006.01)

Patent

CA 1329740

ABSTRACT Integral, gradient, skinned, submicroscopically porous, anisotropic, hydrophilic, asymmetric polyamide membranes comprising: (a) a first porous polyamide zone obtained from a poly- amide solution formulated to give coagulated film with pores of a given size, (b) a fabric support imbedded in the first porous poly- amide layer, and (c) a second porous polyamide zone having a skinned outer surface, obtained from a polyamide solution having the same constituents as the solution used to form the first porous polyamide zone but solution post-treated to give pores sub- stantially smaller than those in the first porous polyamide zone, (d) as well as a process for producing such membranes, are disclosed.

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