Production of fibrillated fiber

Abstract

Abstract PURPOSE:To obtain the titled fiber having highly fibrillated three-dimentional network structure and having high tenacity, by dissolving an isotactic polypropylene polymer having high polymerization degree in a solvent and spinning the obtained dope under specific condition. CONSTITUTION:An isotactic polypropylene polymer is charged in an autoclave 1. After eliminating air from the autoclave, a solvent is introduced into the autoclave through the valve 7, and the autoclave is closed. The polymer is dissolved in a solvent under heating with a heater, and the polymer solution is subjected to the flush spinning at a spinning temperature below the critical temperature of the solvent through the spinning nozzle 11 having a nozzle diameter of 0.75-1.5mm. The MFR of the polymer is maintained to <=15 just before extrusion and the pressure of the polymer solution is dropped in the course of passing the solution through the pressure-drop orifice 9 and the pressure in the reduced pressure chamber 10 is lowered below the internal pressure of autoclave.

Inventors

• 👤 Ikuo Ueno
• 👤 郁雄 上野
• 👤 Kozo Ito
• 👤 伊藤　浩三

Bibliographic Details