Hollow fiber and method of manufacturing the same
AssigneeNippon Zeon Co., Ltd.
InventorYasushi Joh
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Abstract
A method of manufacturing a hollow fiber which comprises providing a spinning solution of a water miscible organic solvent and a high molecular weight compound which may be polyacrylonitrile, a copolymer of acrylonitrile, alpha cellulose, a cellulose ester, polymethylmethacrylate, poly vinyl chloride, or poly-.gamma.-benzyl glutamate. This spinning solution is extruded through an annular slit while simultaneously, an alkaline or acid aqueous salt solution is extruded from an orifice encircled by the annular slit. The aqueous salt solution has a salt content of 15 to 50% by weight and there is sufficient alkali or acid present in the aqueous salt solution to effect controlled hydrolysis of the high molecular weight compound.
Claims12
A method of manufacturing a hollow fiber which comprises:
- providing a spinning solution of a water miscible organic solvent having a dipole moment less than 3.6.times.10.sup.-18 esu and a high molecular weight compound selected from the group consisting of polyacrylonitrile, a copolymer of acrylonitrile, a cellulose ester, polymethylmethacrylate, and poly-.gamma.-benzyl glutamate, extruding said spinning solution through an annular slit,
- simultaneously extruding an alkaline or acid aqueous salt solution from an orifice encircled by said annular slit, said aqueous salt solution having a a salt content of 15 to 50% by weight, being a non-coagulant for said spinning solution, being immiscible with said spinning solution and being capable of developing a phase separation with said solvent by a salting out effect, there being sufficient alkali or acid present in said aqueous salt solution to effect hydrolysis of said high molecular weight compound, and
- introducing the extruded spinning solution with said aqueous salt solution contained therein into a coagulating bath to initiate coagulation.
Dependencies are inferred from the claim text.