Process for preparing aramid copolymer yarn using a halide acid wash
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United States of America Patent
Stats
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Mar 26, 2019
Grant Date -
Nov 13, 2014
app pub date -
Jan 11, 2012
filing date -
Jan 11, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention concerns methods for removing sulfur from yarn comprising the steps of: a) contacting never-dried polymeric yarn with an aqueous base, the polymer comprising imidazole groups and said polymer comprising sulfur atoms characterized as being in the form of sulfate anions; b) contacting the yarn with an aqueous acid comprising a halide; and c) rinsing the yarn.
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International Classification(s)
- 2012 Application Filing Year
- D01D Class
- 164 Applications Filed
- 142 Patents Issued To-Date
- 86.59 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- D01D Class
- 0 % this patent is cited more than
- 6 Age
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|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Sep 26, 2026 |
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