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US 12,312,479 B2Granted
Printable dispersion with tunable viscosity
AssigneeBrewer Science Inc.
InventorsZun Chen, Jonathan J. Fury, Alec Neeson
Life of this patent
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Abstract
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.
Claims10
A method comprising:
- reacting a polymer dispersed or dissolved in a solvent system with a base to form a salt dispersion or solution comprising a salt of said polymer, wherein said solvent system comprises one or more original solvents and wherein said polymer comprises
- where R1 is chosen from
- adding a new solvent to said salt dispersion or solution to form a solvent swap dispersion or solution, said new solvent being different from said one or more original solvents and said new solvent having a boiling point in the range of 125° C. to 250° C.;
- removing the majority of said one or more original solvents from said solvent swap dispersion or solution to yield a solvent-swapped dispersion or solution;
- and
- forming a film of said solvent-swapped dispersion or solution on a surface of a substrate.
3 more elements
Dependencies are inferred from the claim text.