Polybenzazole and fiber thereof
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United States of America Patent
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-
Jan 1, 2002
Grant Date -
Jun 7, 2001
app pub date -
Dec 5, 2000
filing date -
Dec 6, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polybenzazoleolybenzazole having a residual content of a BB-PBZ monomer of not more than 0.010 wt %, which is obtained by dehydration polymerization condensation of an AA-PBZ monomer of the formula (I) ##STR1## wherein Ar is a quadrivalent aromatic organic residue and X is O, S or NH, and a BB-PBZ monomer of the formula (II) W--Z--W (II) wherein Z is an optionally substituted divalent aromatic organic residue and W is a carboxyl group or a group derived from the carboxyl group, which is reactive with --XH in the AA-PBZ monomer. Because the residual content of the BB-PBZ monomer in polybenzazole is not more than 0.010 wt %, a polybenzazole fiber having a small filament denier can be produced stably at a high speed without suffering from thread breakage during the production.
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