Process for producing asymmetrical hollow filament membranes of

Details Process for producing asymmetrical hollow filament membranes of Process for producing asymmetrical hollow filament membranes of

1982-09-20

1984-06-12

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264561, 2642095, 428398, B01D 3916

Patent

active

044540850

ABSTRACT:
A process is disclosed for the production of asymmetrical hollow filament membranes suitable for ultrafiltration and/or microfiltration, in which a spinning solution composed of a polyamide or a mixture of polyamides and/or copolyamides, formic acid and a coagulating core liquid, is extruded into a coagulating setting bath liquid, and the hollow filaments are stretched after leaving the setting bath, in the wet state. The pH-value-difference between core liquid and setting bath liquid should be at least 3. The spinning solution contains, in particular, 15 to 25% by weight polyamide, 5 to 20% by weight polyethylene glycol, up to 10% by weight customary additive and formic acid. Preferred embodiments include a stretching ratio amounting to between 1:1.5 and 1:2.5, and having core liquid and setting bath liquid chosen from various combinations of caustic soda, glycol, formic acid or polyethylene glycol. Also disclosed are hollow filament membranes in which the hollow filament is of uniform, eccentric or profiled shape.

REFERENCES:
patent: 3551331 (1970-12-01), Cescon et al.
patent: 3605162 (1971-09-01), Long
patent: 3710945 (1973-01-01), Dismore
patent: 3724672 (1973-04-01), Leonard et al.
patent: 4291096 (1981-09-01), Taylor
patent: 4323627 (1982-04-01), Joh et al.
patent: 4340481 (1982-07-01), Mishiro et al.

Affiliated with

Also associated with

Rating

Process for producing asymmetrical hollow filament membranes of does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing asymmetrical hollow filament membranes of , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing asymmetrical hollow filament membranes of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-120876