Compositions useful for making microporous polyvinylidene fluori

Details Compositions useful for making microporous polyvinylidene fluori Compositions useful for making microporous polyvinylidene fluori

1989-12-05

1991-05-07

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55159, 21050023, 21050042, 264 41, B01D 5322, B01D 7134

Patent

active

050133390

ABSTRACT:
This invention relates a composition useful for preparing a polyvinylidene fluoride polymer membrane containing (1) a polyvinylidene fluoride polymer, (2) glycerol monoacetate, glycerol diacetate, glycerol triacetate, or mixtures thereof, and (3) optionally glycerol, wherein the polyvinylidene fluoride polymer membrane prepared from the composition is useful for a membrane liquid separation process such as microfiltration, ultrafiltration, dialysis, or membrane stripping. In another aspect, this invention is an improved process for using the composition to prepare a polyvinylidene fluoride polymer membrane by forming a mixture of the composition, heating the mixture to a temperature at which the mixture becomes a homogeneous fluid, and extruding, molding, or casting the homogeneous fluid into a membrane. Another aspect of this invention relates to a polyvinylidene fluoride polymer membrane where the fabricated membrane contains glycerol monoacetate, glycerol diacetate, glycerol triacetate, or mixtures thereof, and optionally glycerol.

REFERENCES:
patent: 4203848 (1980-05-01), Grandine, II
patent: 4861480 (1989-08-01), Berardo et al.
patent: 4869857 (1989-09-01), Itoh et al.
patent: 4874516 (1989-10-01), Kondo
patent: 4943373 (1990-07-01), Onishi et al.

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