Bio-electrode composition, bio-electrode, and method for manufacturing a bio-electrode
The present invention provides a bio-electrode composition including a silicone bonded to a sulfonimide salt, wherein the sulfonimide salt is shown by the following general formula (1): wherein R 1 represents a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms optionally having an aromatic group, an ether group, or an ester group, or an arylene group having 6 to 10 carbon atoms; Rf represents a linear, branched, or cyclic alkyl group having 1 to 4 carbon atoms and containing at least one fluorine atom; M + is an ion selected from a lithium ion, a sodium ion, a potassium ion, and a silver ion. This can form a living body contact layer for a bio-electrode that is excellent in electric conductivity and biocompatibility, light-weight, manufacturable at low cost, and free from large lowering of the electric conductivity even though it is wetted with water or dried.
1. A bio-electrode composition comprising:
a silicone bonded to a sulfonimide salt as a component (A); and
an adhesive resin as a component (B),
wherein the sulfonimide salt is shown by the following general formula (1):
wherein R 1 represents a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms or an arylene group having 6 to 10 carbon atoms, with the alkylene group optionally having an aromatic group, an ether group, or an ester group; Rf represents a linear, branched, or cyclic alkyl group having 1 to 4 carbon atoms and containing at least one fluorine atom; M + is an ion selected from a lithium ion, a sodium ion, a potassium ion, and a silver ion.
2. The bio-electrode composition according to claim 1 , wherein the silicone bonded to a sulfonimide salt has a repeating unit-a shown by the following general formula (2):
wherein R 1 , Rf, and M + are as defined above; R 2 represents a linear, branched, or cyclic alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, with the alkyl group optionally substituted by a halogen atom.
3. The bio-electrode composition according to claim 1 , wherein the component (B) is one or more resins selected from a silicone resin, a (meth)acrylate resin, and a urethane resin.
4. The bio-electrode composition according to claim 2 , wherein the component (B) is one or more resins selected from a silicone resin, a (meth)acrylate resin, and a urethane resin.
5. The bio-electrode composition according to claim 1 , wherein the component (B) contains a silicone resin having an R x SiO (4-x)/2 unit (wherein, R represents an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and “x” is a number in a range of 2.5 to 3.5) and an SiO 2 unit, diorganosiloxane having an alkenyl group, and organohydrogenpolysiloxane having an SiH group.
6. The bio-electrode composition according to claim 2 , wherein the component (B) contains a silicone resin having an R x SiO (4-x)/2 unit (wherein, R represents an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and “x” is a number in a range of 2.5 to 3.5) and an SiO 2 unit, diorganosiloxane having an alkenyl group, and organohydrogenpolysiloxane having an SiH group.
7. The bio-electrode composition according to claim 3 , wherein the component (B) contains a silicone resin having an R x SiO (4-x)/2 unit (wherein, R represents an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and “x” is a number in a range of 2.5 to 3.5) and an SiO 2 unit, diorganosiloxane having an alkenyl group, and organohydrogenpolysiloxane having an SiH group.
8. The bio-electrode composition according to claim 1 , further comprising a carbon powder and/or a metal powder as a component (C).
9. The bio-electrode composition according to claim 8 , wherein the carbon powder is either or both of carbon black and carbon nanotube.
10. The bio-electrode composition according to claim 9 , wherein the metal powder is a powder of a metal selected from gold, silver, platinum, copper, tin, titanium, nickel, aluminum, tungsten, molybdenum, ruthenium, chromium, and indium.
11. The bio-electrode composition according to claim 10 , wherein the metal powder is a silver powder, a copper powder, a tin powder, or a titanium powder.
12. The bio-electrode composition according to claim 1 , further comprising an organic solvent as a component (D).
13. A bio-electrode comprising an electro-conductive base material and a living body contact layer formed on the electro-conductive base material;
wherein the living body contact layer is a cured material of the bio-electrode composition according to claim 1 .
14. The bio-electrode according to claim 13 , wherein the electro-conductive base material comprises one or more species selected from gold, silver, silver chloride, platinum, aluminum, magnesium, tin, tungsten, iron, copper, nickel, stainless steel, chromium, titanium, carbon, and an electro-conductive polymer.
15. A method for manufacturing a bio-electrode having an electro-conductive base material and a living body contact layer formed on the electro-conductive base material, comprising:
applying the bio-electrode composition according to claim 1 onto the electro-conductive base material; and curing the bio-electrode composition; thereby forming the living body contact layer.
16. The method for manufacturing a bio-electrode according to claim 15 , wherein the electro-conductive base material comprises one or more species selected from gold, silver, silver chloride, platinum, aluminum, magnesium, tin, tungsten, iron, copper, nickel, stainless steel, chromium, titanium, carbon, and an electro-conductive polymer.