Modification of polyvinylidene fluoride membrane and method of f

Details Modification of polyvinylidene fluoride membrane and method of f Modification of polyvinylidene fluoride membrane and method of f

1994-07-07

1996-07-02

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210654, 21050035, 21050042, B01D 7134

Patent

active

055319009

ABSTRACT:
There is provided a filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing a positively charged organic phosphonium compound grafted to the membrane in a concentration sufficient to provide a surface of said membrane with a positive charge such that there is minimal susceptibility to the extraction of said polymer. The polymer may also contain an acrylate or methacrylate. There is also provided a method for ultrapurifying a liquid and an ultrapurifying system for water.

REFERENCES:
patent: 3524546 (1970-08-01), Hoehn et al.
patent: 4377481 (1983-03-01), Takabhazy
patent: 5137633 (1992-08-01), Wang
patent: 5246586 (1993-09-01), Bah et al.
patent: 5282971 (1994-02-01), Degen et al.
Robert Rabinowitz and Ruth Marcus, "Polymerization Of Vinylphosphonium Compounds", Journal of Polymer Science: Part A. vol. 3, pp. 2063-2074 (1965).

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