Production of and drying of copolymer fibers
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United States of America Patent
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Feb 27, 2018
Issued Date -
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app pub date -
Jan 13, 2012
filing date -
Jan 13, 2011
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Abstract
The present invention concerns processes for reducing water in never-dried fiber comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride, the process having the following steps in a continuous process, (a) a step of drying a never-dried fiber at less than 100 C until the moisture content of the fiber is less than 60 weight percent; and (b) a step of further drying the fiber above 150° C. while the moisture content of the fiber is no more than 40 weight percent; and the fiber being further heated to at least 350° C. in either an additional continuous or separate step.
First Claim
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- E. I. DU PONT DE NEMOURS AND COMPANY
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Allen, Steven R | Midlothian, US | 35 | 167 |
Newton, Christopher William | Richmond, US | 39 | 73 |
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