23-09-2021 дата публикации
Номер: US20210292581A1
Принадлежит:
A copolymer of polytetrafluoroethylene and a perfluoro acid (e.g., Nafion™) is neutralized by a base to yield its corresponding salt, and a high-boiling-point compatible solvent is used as a substituting solvent, with the original, low-boiling-point solvent being removed by rotor evaporation. The resulting dispersion is screen printable, and its viscosity is controllable by adjusting its solids content. This screen-printable salt dispersion is especially useful in printed electronics applications such as sensors. 2. The method of claim 1 , further comprising adding a new solvent to said dispersion or solution claim 1 , said new solvent being different from said one or more original solvents.3. The method of claim 2 , further comprising removing the majority of said one or more original solvents.4. The method of claim 1 , wherein said base is chosen from sodium hydroxide claim 1 , tetrabutylammonium hydroxide claim 1 , silver acetate claim 1 , silver lactate claim 1 , zinc acetate claim 1 , potassium hydroxide claim 1 , tetraethylammonium hydroxide claim 1 , tetramethylammonium hydroxide claim 1 , sodium bicarbonate claim 1 , ammonium hydroxide claim 1 , sodium carbonate claim 1 , and mixtures thereof.5. The method of claim 1 , wherein said reacting comprises titrating said dispersion or solution with said base until the dispersion or solution has a pH of about 6.3 to about 7.2.6. The method of claim 2 , wherein said new solvent has a boiling point of from about 100° C. to about 300° C.7. The method of claim 2 , wherein said new solvent is chosen from water claim 2 , 2-methyl-1 claim 2 ,3 propanediol claim 2 , 1 claim 2 ,2-propanediol claim 2 , 1 claim 2 ,3-propanediol claim 2 , 1 claim 2 ,2-butanediol claim 2 , 2 claim 2 ,3-butanediol claim 2 , 1 claim 2 ,3-butanediol claim 2 , 1 claim 2 ,4-butanediol claim 2 , 1 claim 2 ,2-pentanediol claim 2 , 2 claim 2 ,4-pendanediol claim 2 , 1 claim 2 ,2-hexanediol claim 2 , glycerol claim 2 , 1 claim 2 ,2 claim 2 ,4- ...
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