Title:
PRODUCTION OF ETHYLENE VINYL ALCOHOL COPOLYMER HOLLOW FIBER MEMBRANE
Document Type and Number:
Japanese Patent JP3203047
Kind Code:
B
Abstract:
PURPOSE: To stably produce ethylene vinyl alcohol copolymer hollow fiber membrane without cementation by specifying temp. of a coagulation liquid and spinning dope and concn. of the coagulation liquid when ethylene vinyl alcohol copolymers are dissolved and coagulated in the coagulation liquid.
CONSTITUTION: Ethylene vinyl alcohol copolymers are dissolved in a solvent such as dimethylsulfoxide and extruded through an annular nozzle into a coagulation bath. Temp. of the coagulation bath CT°C, coagulation bath concn. C%, spinning dope temp. DT°C, glass transition temp. of satd. water-contg. ethylene vinyl alcohol copolymers Tg, °C, and glass transition temp. of dry ethylene vinyl alcohol copolymers Tg2°C satisfy the relation of Tg1-30<CT<Tg1+50, C≤45-CT, Tg2-25<DT. Thereby, the opening of hollow fibers is not required in the process of making modules.
Inventors:
Suehiro, Takeshi
Fukui, Yoshimasa
Okamoto, Takehiko
Jinnou, Yoshinobu
Fukui, Yoshimasa
Okamoto, Takehiko
Jinnou, Yoshinobu
Application Number:
JP1992000128143
Publication Date:
June 22, 2001
Filing Date:
April 20, 1992
Export Citation:
Assignee:
KURARAY CO LTD
International Classes:
B01D71/38; B01D71/00; (IPC1-7): B01D71/38
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