Process for surface modifying a microporous membrane

Details Process for surface modifying a microporous membrane Process for surface modifying a microporous membrane

1988-12-30

1990-04-10

Spear, Frank

Liquid purification or separation

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Material

21050038, 210502, 210504, 210505, 2105021, B01D 1300

Patent

active

049158392

ABSTRACT:
A process for surface modifying skinless hydrophilic microporous membrane having an internal microstructure throughout said membrane and a surface modifying amount of surface modifying agent bound thereto without substantial pore reduction of pore blockage involves the steps of providing a dope solution of a membrane forming polymer in a solvent system comprising a mixture of at least one solvent and one non-solvent for the polymer, and a membrane surface modifying agent, and combining said dope solution with sufficient additional non-solvent for the polymer to precipitate said membrane from said dope solution.

REFERENCES:
patent: 3246767 (1966-04-01), Pall et al.
patent: 4212744 (1980-07-01), Oota
patent: 4431545 (1984-02-01), Pall et al.

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