D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
18/603
D01F 6/18 (2006.01) D01D 5/24 (2006.01)
Patent
CA 1042166
ABSTRACT OF THE DISCLOSURE A hollow fiber of acrylonitrile polymer for ultrafilter use, said acrylonitrile polymer containing at least 60 mol % of acrylonitrile units, having a structure consisting of (1) a reticulate porous region concentric with the central axis of the hollow fiber; the reticulate porous region including therewithin at least one succession of voids concentric with the central axis of the hollow fib??? and (2) a gradient-type porous region adjacent to the outer portion of the reticulate porous region or to each of the outer and inner portions of the reticulate porous region and con- centric with the reticulate porous region and the central axis of the hollow fiber; the average sized of pores in a gradient- type porous region decreasing from about 5µ-1µ adjacent the reticulate porous region to about 0.1µ-several .ANG. at the surface of the hollow fiber, is prepared by dissolving, at a temperature in the range of -5°C to 0°C, an acrylonitrile polymer containing at least 60 mol% of acrylonitrile units in a nitric acid aqueous solution having a concentration in the range of 65-95% by weight to prepare a spinning solution, having a polymer concentration in the range of 2-40% by weight, extruding the resultant solu- tion through spinnorettes having ? ring form orifices into an aqueous toagulation bath, having a concentration of nitric acid of 30% by weight or less, at a temperature of 4-50°C and con- comitantly feeding a liquid as an internal coagulant into the central part of the ring form orifices.
169757
Hashino Yasuo
Konno Tsugio
Sawabu Hitoshi
Yoshino Masatsugu
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