Phosphonated PBI fiber
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United States of America Patent
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Apr 16, 2024
Grant Date -
Jan 12, 2017
app pub date -
Jun 27, 2016
filing date -
Jul 6, 2015
priority date (Note) -
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Abstract
A fiber is made with a polybenzimidazole (PBI) polymer with a phosphoric acid pick-up (APU) in the range of 1-25% (PBI-p fiber). The PBI-p fiber may have a LOI ≥50% and/or an initial thermal decomposition temperature in air of ≥555° C. A method of making a phosphonated polybenzimidazole fiber comprises the steps of: spinning an untreated PBI resin into a PBI fiber; treating the PBI fiber with phosphoric acid, and thereby obtaining a PBI fiber with 1-25 wt. % phosphoric acid APU.
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