Invention Grant
- Patent Title: Process for preparing aramid copolymer yarn having low residual sulfur
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Application No.: US14371746Application Date: 2012-01-11
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Publication No.: US09732442B2Publication Date: 2017-08-15
- Inventor: Steven R. Allen , Vlodek Gabara , Joseph Lenning Lowery , Steven Raymond Lustig , Christopher William Newton , David J. Rodini , Andrew J. Sitter
- Applicant: Steven R. Allen , Vlodek Gabara , Joseph Lenning Lowery , Steven Raymond Lustig , Christopher William Newton , David J. Rodini , Andrew J. Sitter
- Applicant Address: US DE Wilmington
- Assignee: E I DU PONT DE NEMOURS AND COMPANY
- Current Assignee: E I DU PONT DE NEMOURS AND COMPANY
- Current Assignee Address: US DE Wilmington
- International Application: PCT/US2012/020948 WO 20120111
- International Announcement: WO2013/105954 WO 20130718
- Main IPC: D01D10/06
- IPC: D01D10/06 ; D01F11/06 ; D01D5/06 ; D01F6/80 ; D01F11/08 ; B29D99/00
Abstract:
The present invention concerns methods for producing a yarn comprising the steps of: (a) producing a plurality of dope filaments by spinning a polymer solution in sulfuric acid through a multi-hole spinneret, the polymer comprising imidazole groups; (b) coagulating the plurality of dope filaments into an as-spun yarn; (c) contacting the yarn with an aqueous base having a pKa less than or equal to 11; and (d) rinsing the yarn.
Public/Granted literature
- US20140353858A1 PROCESS FOR PREPARING ARAMID COPOLYMER YARN HAVING LOW RESIDUAL SULFUR Public/Granted day:2014-12-04
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