Process for producing a cellulose acetate- type...

Details Process for producing a cellulose acetate- type... Process for producing a cellulose acetate- type...

C - Chemistry, Metallurgy

08

J

18/14

C08J 9/28 (2006.01)

Patent

CA 1140713

ABSTRACT OF THE DISCLOSURE . A process for producing a cellulose acetate- type permselective membrane having very high water- permeability and protein retention, which comprises casting a dope comprising (a) 1 part by weight of cellu- lose acetate, and (b) 2 to 20 parts by weight of a mixed solvent composed of (i) dimethylsulfoxide and (ii) at least one water-soluble organic compound selected from the group consisting of monohydric alcohols having 2 to 5 carbon atoms, dihydric alcohols of the formula HO (RO)n H wherein R is an alkylene group having 2 or 3 carbon atoms and n is an integer of 1 to 16, and carboxy- lic acids having 1 or 2 carbon atoms, the weight ratio of said water-soluble organic compound to dimethylsulfoxide being not more than l; and solidifying the resulting raw membrane with a coagulating solution.

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