Process for extruding semi-permeable membrane having separate ho

Details Process for extruding semi-permeable membrane having separate ho Process for extruding semi-permeable membrane having separate ho

1989-12-22

1992-12-15

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2642091, 264559, 264561, 264562, 26421116, 21050023, D01D 5247

Patent

active

051714930

ABSTRACT:
A process for the production of a porous organic material, in particular an organic semi-permeable membrane, provided with a plurality of separate passageways, comprising dissolving a polymer in a solvent, using a drawplate comprising needles having a shape conjugate with that of the passageways and external dimensions comprising between 0.7 and 1.2 times those of said passageways and an extrusion orifice of a conjugate fome to that of the extrudate and of internal dimensions comprising between 0.8 and 1.2 times those of said extrudate, injecting around the needles a solution having a viscosity greater than 500 millipascal-second, introducing into the interior of the conduits of the drawplate a centering fluid which is a non-solvent with respect to the polymer and able to precipitate the polymeric solution, causing the extrudate to travel from the output of the drawplate a distance da in a gaseous atmosphere which is non-precipitating with respect to the polymeric solution such that 500.times.e<da<0.8 m, wherein e is the maximum distance, recovering the extrudate in a liquid bath which is precipitating for the polymeric solution, and taking up the precipitated extrudate with a linear take-up speed Ve such that Ve/Vs<1.2, where Vs is the average extrusion speed.

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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