Hydrophilic membranes and filters and method for preparing same

Details Hydrophilic membranes and filters and method for preparing same Hydrophilic membranes and filters and method for preparing same

1995-06-01

1996-04-02

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050042, B01D 7138

Patent

active

055037461

ABSTRACT:
Articles having a complex geometric configuration have hydrophilicity imparted to at least a portion of surfaces of the articles while substantially retaining the complex geometric configuration. The hydrophilicity is imparted by an extremely thin, self-interlocking shell of tactic, hydrophilic poly(vinyl alcohol) enveloping the surfaces. A tactic poly(vinyl alcohol) precursor applied to surfaces of the supporting structure is reacted in situ on the surfaces with a hydrolysis reagent to prepare the tactic, hydrophilic poly(vinyl alcohol) shell. The article having the hydrophilic shell is highly resistant to solvent washout. Hydrophilicity and hydrophobicity can be reversibly provided on regio-specific surfaces of the article. Articles in the form of membranes useful as filters are also described.

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