Process for preparing yarn derived from aramid copolymer fiber having low residual sulfur
AssigneeE. I. Du Pont de Nemours and Company
InventorsSteven R. Allen, Vlodek Gabara, Joseph Lenning Lowery, Steven Raymond Lustig, Christopher William Newton, David J. Rodini, Andrew J. Sitter
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Abstract
The present invention concerns processes for producing a yarn comprising polymer comprising imidazole groups, the process having the following steps: (a) spinning a solution of polymer in sulfuric acid to give rise to a plurality of dope filaments; (b) coagulating the plurality of dope filaments into a multi-filament as-spun yarn; and (c) washing the as-spun multi-filament yarn with an aqueous acid comprising a halide or an aqueous salt comprising a halide or combination thereof.
Claims32
A process for producing a yarn comprising polymer, said polymer comprising imidazole groups, the process having the following steps:
- (a) spinning a solution of polymer in sulfuric acid to give rise to a plurality of dope filaments;
- (b) coagulating the plurality of dope filaments into a multi-filament as-spun yarn;
- and
- (c) washing the as-spun multi-filament yarn with an aqueous acid comprising a halide or an aqueous salt comprising a halide or combination thereof.
A process for producing a yarn comprising polymer comprising imidazole groups, the process having the following steps:
- (a) spinning a solution of polymer in sulfuric acid to give rise to a plurality of dope filaments;
- (b) coagulating the plurality of dope filaments in a coagulation bath containing an aqueous acid comprising a halide or an aqueous salt comprising a halide or combination thereof to form a multi-filament as-spun yarn.
Dependencies are inferred from the claim text.