Production of hollow cellulose derivative fiber

Abstract

Abstract PURPOSE: To obtain the titled hollow fiber, useful for an ultrafiltration membrane, and having improved tensile strength, water permeability and fractionating properties, by extruding a solution of cellulose derivatives having different properties from a spacific double-pipe type spinneret with a liquid of specific coagulation value, and drawing the coagulated fiber. CONSTITUTION: Two or more cellulose derivatives having different properties are dissolved in a nonvolatile organic solvent, e.g. DMSO. The resulting solution is extruded from the outer annular part of a double-pipe type spinneret, and a liquid having a coagulation value of 20W150 for the cellulose derivative solution is extruded from the inner pipe of the spinneret simultaneously to form a hollow dope. The dope is then passed through a narrow space, coagulated in an aqueous coagulation both and drawn in water at 30W90°C at a draw ratio of 1.05W1.5. The cellulose derivatives are prepferably a mixture of cellulose acetates having an acetylation degree of 50W57% and 58W62% at a weight ratio of 20:1W1:5, and the concentration in the dope is preferably 10W25wt%. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Masamichi Ishida
• 👤 Toru Takemura
• 👤 Jun Kamo

Bibliographic Details