| 发明名称 |
Method for removing sulfur from fiber using a weak base |
| 摘要 |
The present invention concerns methods for removing sulfur from a fiber comprising the steps of: a) contacting never-dried sulfur-containing fiber in a yarn with an aqueous base having a pKa less than or equal to 11 to release at least a portion of said sulfur, said sulfur comprising, at least in part, sulfate anions and said yarn comprising fiber derived from polymer comprising imidazole groups; and b) rinsing said yarn to remove at least a portion of released sulfur. |
| 申请公布号 |
US9469922(B2) |
申请公布日期 |
2016.10.18 |
| 申请号 |
US201214371744 |
申请日期 |
2012.01.11 |
| 申请人 |
E I DU PONT DE NEMOURS AND COMPANY |
发明人 |
Allen Steven R.;Gabara Vlodek;Lowery Joseph Lenning;Lustig Steven Raymond;Newton Christopher William;Rodini David J.;Sitter Andrew J. |
| 分类号 |
C11D11/00;D01F6/80;D01D10/06 |
主分类号 |
C11D11/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A method for removing sulfur from a fiber comprising the steps of:
a) contacting never-dried sulfur-containing fiber in a yarn with an aqueous base having a pKa less than or equal to 11 to release at least a portion of said sulfur, said sulfur comprising, at least in part, sulfate anions and said yarn comprising fiber derived from polymer comprising imidazole groups; and b) rinsing said yarn to remove at least a portion of released sulfur. |
| 地址 |
Wilmington DE US |
