Copolymer fibers and processes for making same
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United States of America Patent
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Feb 17, 2015
Grant Date -
Jan 17, 2013
app pub date -
Jan 13, 2012
filing date -
Jan 13, 2011
priority date (Note) -
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Abstract
The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to the moles of para-phenylenediamine is 30/70 to 85/15; the yarn having a sulfur content greater than 0.1%; and the hydrolytic strength retention of the yarn is greater than 60%. The invention also concerns processes for making such yarns.
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