| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a wholly aromatic polyamide filament. <P>SOLUTION: Wholly aromatic polyamide filament is characterized in that the crystallinity (X) before heat treatment ranges from 70 to 79% and the apparent crystal size (ACS, based on 200 plane) before heat treatment ranges from 42 to 50Å. Accordingly, the wholly aromatic polyamide filament has reduced defects in the crystal itself, thereby exhibiting more improved physical properties such as strength and modulus. The wholly aromatic polyamide filament is manufactured by multi-stage injection of a coagulant with sulfuric acid concentration lowered sequentially stage by stage, to a spun material fed through a coagulant injection tank. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
