Composite membrane composed of microporous polyvinylidene difluo

Details Composite membrane composed of microporous polyvinylidene difluo Composite membrane composed of microporous polyvinylidene difluo

1991-08-20

1993-08-31

Spear, Frank

Liquid purification or separation

Processes

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

21050042, B01D 7134

Patent

active

052406156

ABSTRACT:
A smooth microporous polyvinylidene difluoride membrane laminated to a porous support is prepared without glues or binders by gelling in aqueous media a layer of a solution of polyvinylidene difluoride upon the porous support. The polyvinylidene difluoride surface of the composite microporous laminated membranes has discrete pore openings with diameters less than 0.2 .mu.m and especially less than 0.12 .mu.m where the density of pore openings with diameters greater than 0.01 .mu.m is at least 1.times.10.sup.5 pores/cm.sup.2 but especially greater than 1.times.10.sup.8 pores/cm.sup.2. These membranes can be used, for example, in filtration or collection of one or more dissolved or suspended substances from a liquid medium.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 4203847 (1980-05-01), Grandine et al.
patent: 4776959 (1988-10-01), Kasai et al.
patent: 4824568 (1989-04-01), Allegrezza, Jr. et al.
patent: 5017292 (1991-05-01), DiLeo et al.

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