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US 4,342,711 AGranted
Method of manufacturing hollow fiber
AssigneeNippon Zeon Co., Ltd.
InventorsYasushi Joh, Masahiro Yamazaki, Noriaki Kaneko, Shigehiko Oikawa, Yoshihiro Makuta, Chizuko Hayashi
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a hollow fiber includes the steps of: extruding a spinning solution of high molecular weight compound dissolved into a solvent, from an annular slit; and simultaneously extruding a liquid consisting of at least one of the solvent and swelling liquid capable of swelling the high molecular weight compound from an orifice encircled by the annular slit.
Claims19
In a method of manufacturing a hollow fiber comprising the steps of:
- (a) extruding a spinning solution containing a high molecular weight compound in a concentration of 10 to 35% by weight from an annular slit, said high molecular weight compound consisting of one of cuprammonium cellulose, cellulose ester, polymethyl methacrylate and polyvinyl chloride;
- (b) simultaneously extruding a core liquid which consists of a low molecular weight compound which is easily mixed or compatible with said spinning solution and is substantially incapable of coagulating said high molecular weight compound, from an orifice encircled by said annular slit;
- and
- (c) introducing said extruded spinning solution with said core liquid into a coagulating bath containing water or mainly water, said spinning solution being coagulated in said coagulating bath,
- wherein the improvement comprises:
- selecting said core liquid from:
- (i) the group of solvents consisting of a dimethyl-sulfoxide-paraformaldehyde mixture, an aqueous cuprammonium solution and a mixture thereof for said cuprammonium cellulose;
- (ii) the group of solvents consisting of acetone, methyl Cellosolve acetate, dimethylsulfoxide, dimethylformamide, dimethylacetamide, methylene chloride, 1,4-dioxane, diacetone alcohol, ethyl lactate, tetrahydrofuran, ethylformamide, methyl formate, and a mixture of at least two of said solvents for said cellulose ester;
- (iii) the group of solvents consisting of acetone, toluene, acetic acid, formic acid, ethyl acetate and a mixture of at least two of these for said polymethyl methacrylate;
- and
- (iv) the group of solvents consisting of dimethylformamide, cyclohexanone, nitrobenzene, mesityl oxide, tetrahydrofuran and a mixture of at least two of said solvents for said polyvinyl chloride
8 more elements
In a method of manufacturing a hollow fiber comprising the steps of:
- (a) extruding a spinning solution containing a high molecular weight compound in a concentration of 10 to 35% by weight from an annular slit, said high molecular weight compound consisting of a member selected from the group consisting of cuprammonium cellulose, cellulose ester, polymethyl methacrylate and polyvinyl chloride;
- (b) simultaneously extruding a core liquid which is compatible with said spinning solution and is substantially incapable of coagulating it, from an orifice encircled by said annular slit;
- and
- (c) introducing said extruded spinning solution with said core liquid into a coagulating bath containing water or mainly water, said spinning solution being coagulated in said coagulating bath,
- wherein the improvement comprises:
- selecting said core liquid from:
- (i) the group of solvents consisting of dimethylsulfoxide-paraformaldehyde mixture and aqueous cuprammonium solution for said cuprammonium cellulose;
- (ii) the group of solvents consisting of acetone, methyl Cellosolve acetate, dimethylsulfoxide, dimethylformamide, dimethylacetamide, methylene chloride, 1,4-dioxane, diacetone alcohol, ethyl lactate, tetrahydrofuran, ethylformamide and methyl formate for said cellulose ester;
- (iii) the group of solvents consisting of acetone, toluene, acetic acid, formic acid and ethyl acetate for said polymethyl methacrylate;
- and
- (iv) the group of solvents consisting of dimethylformamide, cyclohexanone, nitrobenzene, mesityl oxide, tetrahydrofuran.
8 more elements
In a method of manufacturing a hollow fiber comprising the steps of:
- (a) extruding a spinning solution containing a high molecular weight compound in a concentration of 10 to 35% by weight from an annular slit, said high molecular weight compound consisting of one of cellulose ester and polyvinyl chloride;
- (b) simultaneously extruding a core liquid which consists of a low molecular weight compound which is easily mixed or compatible with said spinning solution and is substantially incapable of coagulating said high molecular weight compound, from an orifice encircled by said annular slit;
- and
- (c) introducing said extruded spinning solution with said core liquid into a coagulating bath containing water or mainly water, said spinning solution being coagulated in said coagulating bath;
- wherein the improvement comprises:
- selecting said core liquid from:
- (i) the group of solvents consisting of acetone, methyl Cellosolve acetate, dimethylsulfoxide, dimethylformamide, dimethylacetamide, methylene chloride, 1,4-dioxane, diacetone alcohol, ethyl lactate, tetrahydrofuran, ethylformamide, methyl formate, and a mixture of at least two of said solvents, and the group of swelling agents consisting of methyl ethyl ketone, ethyl acetate, Cellosolve acetate, methyl Cellosolve, ethylene glycol, ethylene glycol monoethylether acetate, formamide, triethyl phosphate, hydrogen perchlorate, N-methyl-2-pyrrolidone, t-butanol, diacetin, monoacetin, 1,3 butanediol and a mixture of at least two of said swelling agents for said cellulose ester;
- and
- (ii) the group of solvents consisting of dimethyl formamide, cyclohexanone, nitrobenzene, mesityl oxide, tetrahydrofuran and a mixture of at least two of said solvents, and the group of swelling agents consisting of dipropyl ketone, methyl amyl ketone, methyl isobutyl ketone, acetonylacetone, methyl ethyl ketone, dioxane, dichloromethane, acetic anhydride and a mixture of at least two of said swelling agents for said polyvinyl chloride.
6 more elements
In a method of manufacturing a hollow fiber comprising the steps of:
- (a) extruding a spinning solution containing a high molecular weight compound in a concentration of 10 to 35% by weight from an annular slit, said high molecular weight compound consisting of one of cellulose ester and polyvinyl chloride;
- (b) simultaneously extruding a core liquid which consists of a low molecular weight compound which is easily mixed or compatible with said spinning solution and is substantially incapable of coagulating said high molecular weight compound, from an orifice encircled by said annular slit;
- and
- (c) introducing said extruded spinning solution with said core liquid into a coagulating bath containing water or mainly water, said spinning solution being coagulated in said coagulating bath;
- wherein the improvement comprises:
- selecting said core liquid from:
- (i) the group of swelling agents consisting of methyl ethyl ketone, ethyl acetate, Cellosolve acetate, methyl Cellosolve, ethylene glycol, ethylene glycol monoethylether acetate, formamide, triethyl phosphate, hydrogen perchlorate, N-methyl-2-pyrrolidone, t-butanol, diacetin, monacetin, 1,3 butanediol and a mixture of at least two of said swelling agents for said cellulose ester;
- and
- (ii) the group of swelling agents consisting of dipropyl ketone, methyl amyl ketone, methyl isobutyl ketone, acetonylacetone, methyl ethyl ketone, dioxane, dichloromethane, acetic anhydride and a mixture of at least two of said swelling agents for said polyvinyl chloride.
6 more elements
In a method of manufacturing a hollow fiber comprising the steps of:
- (a) extruding a spinning solution containing a high molecular weight compound in a concentration of 10 to 35% by weight from an annular slit, said high molecular weight compound consisting of a member selected from the group consisting of cellulose ester and polyvinyl chloride;
- (b) simultaneously extruding a core liquid which is compatible with said spinning solution and is substantially incapable of coagulating it, from an orifice encircled by said annular slit;
- and
- (c) introducing said extruded spinning solution with said core liquid into a coagulating bath containing water or mainly water, said spinning solution being coagulated in said coagulating bath;
- wherein the improvement comprises:
- selecting said core liquid from:
- (i) the group of solvents consisting of acetone, methyl Cellosolve acetate, dimethylsulfoxide, dimethylformamide, dimethylacetamide, methylene chloride, 1,4-dioxane, diacetone alcohol, ethyl lactate, tetrahydrofuran, ethylformamide and methyl formate, and the group of swelling agents consisting of methyl ethyl ketone, ethyl acetate, Cellosolve acetate, methyl Cellosolve, ethylene glycol, ethylene glycol monoethylether acetate, formamide, triethyl phosphate, N-methyl-2-pyrrolidone, t-butanol, diacetin, monoacetin and 1,3 butanediol for cellulose ester;
- and
- (ii) the group of solvents consisting of dimethylformamide, cyclohexanone, nitrobenzene, mesityl oxide, tetrahydrofuran and the group of swelling agents consisting of dipropyl ketone, methyl amyl ketone, methyl isobutyl ketone, acetonylacetone, methyl ethyl ketone, dioxane, dichloromethane and acetic anhydride for said polyvinyl chloride.
6 more elements
In a method of manufacturing a hollow fiber comprising the steps of:
- (a) extruding a spinning solution containing a high molecular weight compound in a concentration of 10 to 35% by weight from an annular slit, said high molecular weight compound consisting of a member selected from the group consisting of cellulose ester and polyvinyl chloride;
- (b) simultaneously extruding a core liquid which is compatible with said spinning solution and is substantially incapable of coagulating it, from an orifice encircled by said annular slit;
- and
- (c) introducing said extruded spinning solution with said core liquid into a coagulating bath containing water or mainly water, said spinning solution being coagulated in said coagulating bath;
- wherein the improvement comprises:
- selecting said core liquid from:
- (i) the group of swelling agents consisting of methyl ethyl ketone, ethyl acetate, Cellosolve acetate, methyl Cellosolve, ethylene glycol, ethylene glycol monoethylether acetate, formamide, triethyl phosphate, N-methyl-2-pyrrolidone, t-butanol, diacetin, monoacetin and 1,3 butanediol for said cellulose ester;
- and
- (ii) the group of swelling agents consisting of dipropyl ketone, methyl amyl ketone, methyl isobutyl ketone, acetonylacetone, methyl ethyl ketone, dioxane, dichloromethane and acetic anhydride for said polyvinyl chloride.
6 more elements
Dependencies are inferred from the claim text.