Title:
PRODUCTION OF POLYBENZAZOLE FIBER
Document Type and Number:
Japanese Patent JP3651621
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To increase the retention of the tenacity to be deteriorated, during drying and heat treatment, by treating the coagulated filament spun from the dope of a polybenzazole with a basic solution and drying the filament at a temperature depending on the fraction of the liquid remaining in the filament in a short time.
SOLUTION: The dope of a polybenzazole mainly constituted with structural units of formula I to formula III in an acidic solvent is spun into filaments and coagulated through the air gap in the coagulation bath. Then, the filament is treated with a basic solution to develop the resistance to void formation thereby increasing the limitation temperature causing no void formation and dried at the temperature which is set relating to the fraction of the liquid remaining in the filament. This polybenzazole filament of excellent properties is obtained, even when the drying temperature is raised.
Inventors:
Ishihito Michio
Application Number:
JP22800995A
Publication Date:
May 25, 2005
Filing Date:
September 05, 1995
Export Citation:
Assignee:
TOYO BOSEKI KABUSHIKI KAISHA
International Classes:
C08K3/32; C08G73/22; C08L79/04; D01D5/06; D01D10/06; D01F6/74; (IPC1-7): D01F6/74
Domestic Patent References:
| JP49071040A | ||||
| JP48088139A | ||||
| JP7197307A |