Semi-permeable membranes and processes for making the same

Details Semi-permeable membranes and processes for making the same Semi-permeable membranes and processes for making the same

1981-05-29

1984-02-21

Spear, Jr., Frank A.

Liquid purification or separation

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Material

427245, B01D 3100

Patent

active

044328753

ABSTRACT:
Semi-permeable, porous membranes useful as filtration and reverse osmosis membranes can have or can consist of a porous layer of a hydrophobic polymer rendered hydrophilic at its surface by the presence of a surfactant containing both hydrophobic and hydrophilic groups, the surfactant being bonded to the polymer. Such a membrane may be made by quenching a previously made dry membrane in a solution of the surfactant and then banking the membrane. Such a membrane may also be made by contacting a membrane manufactured by quenching a dope of the hydrophobic polymer with such a solution of the surfactant prior to the membrance being dried after being formed by quenching. Such a membrane can also be made by forming a dope of the hydrophobic polymer and the surfactant and then quenching the dope to form the membrane, this quenching serving to contact the membrane with the surfactant as it is being formed.

REFERENCES:
patent: 4087388 (1978-05-01), Jensen et al.
patent: 4199445 (1980-04-01), Chang et al.
patent: 4203847 (1980-05-01), Grandine
patent: 4302334 (1981-11-01), Jakabhazy et al.

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