PRODUCTION OF READILY FIBRILLATING FIBER

摘要

PROBLEM TO BE SOLVED: To obtain a readily fibrillating fiber which can readily form fibers fibrillated all over their surfaces and is useful for production of filter having high-accuracy and uniform pore diameter and paper of high bulk density. SOLUTION: (A) A cellulosic polymer and (B) another polymer soluble in an amine oxide solvent or its aqueous solution and low in compatibility to the other polymer (A) are dissolved in an amine oxide solvent or its aqueous solution at a weight ratio of 5/95-95/5 to prepare a spinning dope of an islands- in-sea structure in which one of the two polymers forms the islands and the other forms the sea, and the dope is spun. The size of the island phase is 0.5-50μm, preferably 1-10μm in the spinning dope and phase-separated fibers are produced.