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US 10,240,282 B2Granted
Process for preparing aramid copolymer yarn using a halide acid wash
AssigneeE. I. Du Pont de Nemours and Company
InventorsSteven R. Allen, Vlodek Gabara, Joseph Lenning Lowery, Christopher William Newton, David J. Rodini, Andrew J. Sitter
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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.
Claims16
A process for removing sulfur from yarn comprising the steps of:
- a) contacting never-dried polymeric yarn with an aqueous base, said polymeric yarn made from polymer comprising imidazole groups and said polymer comprising sulfur atoms in the form of sulfate anions;
- and subsequently
- b) contacting the yarn with an aqueous acid comprising a halide;
- and
- c) rinsing the yarn.
2 more elements
Dependencies are inferred from the claim text.