Hollow fibers production method thereof and their applications p

Details Hollow fibers production method thereof and their applications p Hollow fibers production method thereof and their applications p

1987-10-30

1989-11-21

Kendell, Lorraine T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

21050022, 21050023, 428376, D02G 300

Patent

active

048822230

ABSTRACT:
Non symmetrical hollow fibres presenting a relatively dense layer (`skin`) (H) of a very small thickness (<1 .mu.m) at their outer periphery, which is bound to a so called `open` structure of which the porosity increases in the direction to the inner face; said porous structure comprises microvoids (1) shaped like elongate fingers open to the inside. The invention also relates to the method for obtaining such a symmetrical hollow fibres by known spinning techniques by dry-wet process, by adding to the solution for spinning the polymer in the solvent at least one particular additive and by adding a particular fluid through the hole of the extruded product. Finally, the invention aims at applying the hollow fibres in question to various fields and particularly in ultra-filtration or micro-filtration, in dialysis, reverse osmosis, in gas permeation or pervaporation or they may also be used as supports for liquid membranes.

REFERENCES:
patent: 3871950 (1975-03-01), Hashino et al.
patent: 4175153 (1979-11-01), Dobo et al.
patent: 4454085 (1984-06-01), Schindler et al.
patent: 4481260 (1984-11-01), Nohmi
J.P. Abstract, 54-10282.
Cabasso, I., et al., Journal of Applied Polymer Science, vol. 21, pp. 165-180, (1977).

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