Process for making a solution of perfluorosulfonated ion exchange polymers
A process for making a solution of perfluorosulfonated ion exchange polymer is disclosed. The process involves heating a slurry containing a perfluorosulfonated ion exchange polymer resin, an organic ether compound and water in a mechanically agitated pressurized vessel to an elevated temperature, so as to totally dissolve the resin in the solution. The perfluorosulfonated ion exchange polymer solution is recovered, and the water and the organic ether compound are removed from the solution. A perfluorosulfonated ion exchange polymer resin remains, which can be coated onto a fabric, or converted into a film which can be laminated onto a fabric. The resulting fabric forms the basis for a chemical and/or biological agent barrier for use in certain types of apparel.
1 . A process for making a solution of perfluorosulfonated ion exchange polymer comprising:
heating a slurry containing a perfluorosulfonated ion exchange polymer resin, an organic ether compound and water in a mechanically agitated pressurized vessel to an elevated temperature, so as to totally dissolve the resin in the solution; and
recovering the perfluorosulfonated ion exchange polymer solution.
2 . The process of claim 1 wherein said elevated temperature is from 180° C. to 280° C.
3 . The process of claim 1 wherein the organic ether compound is selected from the group consisting of cyclic ether, linear ether, glymes and diglymes.
4 . The process of claim 3 , wherein the cyclic either is tetrahydropyran.
5 . The process of claim 3 , wherein the linear ether is diethyl ether or ethyl propyl ether.
6 . The process of claim 3 , wherein the diglyme is ethylene glycol diethyl ether.
7 . The process of claim 1 , wherein the ether to water ratio can range from 5/95 to 80/20 by weight.
8 . The process of claim 1 , wherein the perfluorosulfonated ion exchange polymer resin can be the copolymer of TFE/PDMOP or TFE/POPF and consequently been hydrolyzed and ion exchanged to the final form —SO 3 X, where X can be H, Li, Na, K or N(R 1 )(R 2 )(R 3 )(R 4 ) and R 1 , R 2 , R 3 , and R 4 are the same or different and are H, CH 3 , C 2 H 5 and higher alkyl groups.
9 . The process of claim 1 , further comprising:
removing the water and organic ether compound from the recovered perfluorosulfonated ion exchange polymer solution so that a solid content comprising a perfluorosulfonated ion exchange polymer resin remains.
10 . The process of claim 9 , further comprising converting the resin into a film.
11 . The process of claim 9 , wherein the resin is coated onto a fabric.
12 . The process of claim 10 , wherein the film is laminated onto a fabric.
13 . The coated fabric made by the process of claim 11 .
14 . The laminated fabric made by the process of claim 12.