Porous fibers and membranes and methods for their preparation an

Details Porous fibers and membranes and methods for their preparation an Porous fibers and membranes and methods for their preparation an

1985-10-04

1988-05-17

Spear, Frank

Liquid purification or separation

Processes

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

21050023, 21050036, B01D 1300

Patent

active

047449063

ABSTRACT:
The invention concerns porous fibers and membranes, methods for their preparation and for their use. The fibers are characterized by a smooth porous surface and an apparent density of between about 10 to 90% of the true density of the polymeric starting material employed. The process involves the formation of a homogeneous mixture of at least two components, one of which is a meltable polymer and another liquid inert with respect to the polymer. The mixture formed must be of a binary type, in which there is a temperature range of complete miscibility and a range in which there is a miscibility gap. The mixture is extruded at a temperature above the separation temperature into a bath containing at least some of the inert liquid which is at a temperature below the separation temperature. Upon introduction of the mixture into the bath, the fiber structure of the product is fixed.

REFERENCES:
patent: 4519909 (1985-05-01), Castro

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