Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1980-12-08
1982-03-30
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
2105002, 264561, 264187, 264203, 2642091, 428398, B29D 2700
Patent
active
043223818
ABSTRACT:
A method of manufacturing a hollow fiber which involves preparing a spinning solution of a non-polar water miscible organic solvent and a high molecular weight organic compound consisting of cellulose esters, polymethylmethacrylate, polyvinyl chloride, or poly-.gamma.-benzyl glutamate, extruding the solution through an annular slit, and simultaneously extruding a neutral aqueous salt solution from an orifice encircled by the slit, the solution having a salt content of 15 to 50% by weight and being capable of developing a phase separation with the water miscible organic solvent by means of a salting out effect. The extruded spinning solution is passed substantially downwardly in a vertical direction into an aqueous coagulating bath, the annular slit being separated from the bath by at least 5 mm, the distance being sufficient to cause significant evaporation of the solvent from the spinning solution.
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Nippon Zeon Co. Ltd.
Woo Jay H.
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