Regenerated cellulose hollow fiber and process for...

Details Regenerated cellulose hollow fiber and process for... Regenerated cellulose hollow fiber and process for...

D - Textiles, Paper

01

D

18/15

D01D 5/24 (2006.01)

Patent

CA 1141114

REGENERATED CELLULOSE HOLLOW FIBER AND PROCESS FOR MANUFACTURING SAME ABSTRACT A regenerated cellulose hollow fiber used as a permeable membrane for dialysis and ultrafiltration, which is prepared by hydrolyzing a cellulose ester hollow fiber and characterized as (a) containing a cellulose II crystal structure at a degree of crystallinity of from 40 to 75%, said cellulose II crystal structure having a degree of- crystallite orientation of from 78 to 90% and having a crystallite size of from 60 to 150 angstroms as measured along the fiber axis, and (b) exhibiting a wet strength/wet elongation ratio of from 1.50 to 8Ø The regenerated cellulose hollow fiber is prepared by a process wherein: a dope comprised of cellulose ester in a non-volatile organic solvent is extruded through a circular slit defined between inner and outer tubes of a spinning nozzle having a double tube structure, while a core liquid is forced through the inner tube of said nozzle;the hollow fibrous extrudate is coagulated in a coagulating bath; the coagulated hollow fibrous extrudate is drawn 1.05 to 2.00 times its original length; and then, the drawn hollow fiber still containing a core liquid in the hollow is treated with an aqueous caustic alkali solution containing at least 0.5% by weight of a water soluble metal salt, thereby hydrolyzing the cellulose ester into cellulose.

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