Semipermeable membranes of copolyamides

Details Semipermeable membranes of copolyamides Semipermeable membranes of copolyamides

C - Chemistry, Metallurgy

08

J

18/27

C08J 9/28 (2006.01) B01D 71/56 (2006.01) C08G 69/32 (2006.01)

Patent

CA 1102972

Semipermeable membranes of copolyamides Abstract of the Disclosure The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 11. % by weight, preferably from 4.5 to 8 % by weight, as measured on approximately 40 µ thick symmetrical films at room temperature and at 65 % relative air humidity, a throughflow of 130 to 200 l/m2d for a desalination level of 94.6 to 99.5 % and consisting of an aromatic hetero- cycle-containing copolyamide with a relative viscosity of ?1.4, as measured on a 0.5 % N-methyl pyrrolidone solution at a temperature of 20°C.

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