Hollow fiber of cuprammonium regenerated cellulose and process f

Details Hollow fiber of cuprammonium regenerated cellulose and process f Hollow fiber of cuprammonium regenerated cellulose and process f

1982-09-29

1985-08-13

McCamish, Marion E.

Stock material or miscellaneous articles

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

Rod, strand, filament or fiber

428364, 2105002, 55158, 2642091, 264199, D02G 300, B01D 3900

Patent

active

045350280

ABSTRACT:
A hollow fiber of cuprammonium regenerated cellulose having an axially disposed cylindrical bore extending throughout the fiber length, said bore being filled with a gas. The hollow fiber exhibits an improved dialysis performance and ultrafiltration rate over the conventional hollow fiber. Such a hollow fiber can be produced by a process comprising (a) extruding a spinning dope through an annular orifice while simultaneously injecting a gas into the bore as it is formed, and (b) allowing the fiber extrudate to free fall in an air space and dive into a depth of from 2 to 20 mm below the surface of a coagulation bath only with a downward force gained during said free fall.

REFERENCES:
patent: 3888771 (1975-06-01), Isuge et al.
patent: 4203844 (1980-05-01), Amicel et al.
patent: 4371487 (1983-01-01), Hamada et al.

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