Liquid purification or separation – Filter – Material
Patent
1981-09-14
1984-04-24
Woo, Jay H.
Liquid purification or separation
Filter
Material
264 49, 264199, 2642091, 264561, 428398, B01D 3900
Patent
active
044446632
ABSTRACT:
A liquid composition for the manufacture of a membrane, comprising a reaction product a cuprammonium cellulose with an ammonium or alkali metal salt of a polymer containing 10 to 70 equivalent percent of a carboxyl group and having a number-averaged molecular weight in the range of from 500 to 200,000, and a membrane is obtained by molding the composition in the form of a film, immersing the shaped article thus obtained in a dilute sulfuric acid solution thereby coagulating and regenerating it, subsequently immersing the shaped article in an strong alkali solution thereby expelling said ammonium or alkali metal salt of the polymer therefrom and forming therein fine pores substantially corresponding to the molecular weight of said salt.
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Aoyagi Juuro
Suzuki Kazuhiko
Takahara Kazuaki
Terumo Corporation
Woo Jay H.
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