| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for obtaining polybenzobisoxasole (PBO) fiber having high physical properties by spinning dope having high degree of polymerization and excellent in spinnability. SOLUTION: The PBO fiber having high physical properties is obtained by hydrolyzing and reducing 2-sulfonic acid-4,6-dinitroresorcinol and polymerizing the resultant high-purity 4,6-diaminoresorcinol to afford a high molecular weight PBO and spinning the PBO. COPYRIGHT: (C)2006,JPO&NCIPI
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