Process for producing a semi-permeable membrane by extrusion

Details Process for producing a semi-permeable membrane by extrusion Process for producing a semi-permeable membrane by extrusion

1989-12-22

1992-02-18

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264559, 264561, 264562, 264184, 264205, 2642091, 2642108, 26421116, 264233, 21050023, D01D 5247

Patent

active

050891871

ABSTRACT:
A process for the production of a porous organic material, in particular a semi-permeable membrane, comprising a plurality of separate passageways, including dissolving a polymer in a solvent, using a drawplate having needles of a shape conjugate with those of the passageways and of external dimensions between 0.7 and 1.2 times those of the passageways and an extrusion orifice of a shape conjugate those of the extrudate and of internal dimensions comprising between 0.8 and 1.2 times those of the extrudate, injecting around the needles a solution having a viscosity greater than 500 mPa.s and introducing a centering fluid into the interior of these needles, recovering the extrudate at the output of the drawplate in a precipitating medium in such a manner that the extrudate travels in the medium a distance such that 800.times. e<de<3 m, (e representing the maximum distance of travel for a precipitaing fluid for obtaining complete precipitation of the extrudate), and taking up the precipitated extrudate with a linear take-up speed Ve such that Ve/Vs<1.2 (Wv representing the average speed of the extrusion).

REFERENCES:
patent: 4234431 (1980-11-01), Mishiro et al.
patent: 4481260 (1984-11-01), Nohmi
patent: 4612119 (1986-09-01), Eguchi
patent: 4681713 (1987-07-01), Miyagi et al.
patent: 4822489 (1989-04-01), Nohmi et al.

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