Granted Patent B2

US 12,473,424 · App. 18/944,966 · Granted Nov 18, 2025

Inventors: Kosuke Sugiura (Nagaokakyo, JP); Mika Fujiwaki (Nagaokakyo, JP); Toshiko Shimazaki (Nagaokakyo, JP); Takeshi Torita (Nagaokakyo, JP)

Assignee: MURATA MANUFACTURING CO., LTD.

C08K9/02A61B5/268C08J5/18H01B1/20H01M4/46A61N1/04C08J2333/10C08J2333/14C08K2201/001

Abstract

Claims (28)

1 . A film comprising:

particles of a two-dimensional material containing one or plural layers, wherein the one or plural layers comprise a layer body represented by:

M m X n

wherein

M is at least one metal of Group 3, 4, 5, 6, or 7,

X is a carbon atom, a nitrogen atom, or a combination thereof,

n is not less than 1 and not more than 4, and

m is more than n but not more than 5, and

a modifier or terminal T exists on a surface of the layer body, wherein T is at least one selected from a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom; and

an amphoteric polymer having an anionic functional group and a cationic functional group in one or more monomer units of the amphoteric polymer,

wherein M m X n comprises one or more selected from Ti 2 C, Ti 3 C 2 , Ti 3 (CN), (Cr 2 Ti) C 2 , (Mo 2 Ti)C 2 , (Mo 2 Ti 2 )C 3 , and (Mo 2.7 V 1.3 )C 3 , and

wherein a ratio of the amphoteric polymer to a sum of the particles of the two-dimensional material and the amphoteric polymer in the film is 5 vol % to 70 vol %.

2 . The film according to claim 1 , wherein the anionic functional group and the cationic functional group are present in a same monomer unit.

3 . The film according to claim 1 , wherein the anionic functional group and the cationic functional group are present in separate monomer units.

4 . The film according to claim 1 , wherein the anionic functional group is at least one selected from a carboxylic acid group, a carboxylic acid base, a sulfonic acid group, a sulfonic acid base, a phosphoric acid group, and a phosphoric acid base.

5 . The film according to claim 1 , wherein the cationic functional group is at least one selected from an amine, a phosphonium, and a salt thereof.

6 . The film according to claim 1 , wherein the cationic functional group is at least one selected from a primary amine, a secondary amine, a tertiary amine, an acid salt thereof, and a quaternary ammonium salt, and a primary phosphonium, a secondary phosphonium, a tertiary phosphonium, an acid salt thereof, and a quaternary phosphonium salt.

7 . The film according to claim 1 , wherein the polymer comprises a first monomer unit having the anionic functional group and the cationic functional group.

8 . The film according to claim 7 , wherein the first monomer unit has a phosphorylcholine group.

9 . The film according to claim 7 , wherein the anionic functional group is a first anionic functional group, and the polymer further comprises a second monomer unit having a second anionic functional group.

10 . The film according to claim 1 , wherein the one ore more monomer units of the amphoteric polymer comprise a first monomer unit having the anionic functional group and a second monomer unit having the cationic functional group.

11 . The film according to claim 1 , wherein the amphoteric polymer is an acrylic polymer.

12 . The film according to claim 1 , wherein the amphoteric polymer is hydrophilic.

13 . The film according to claim 1 , wherein the two-dimensional material contains the plural layers, and an interlayer distance between adjacent layers of the plural layers is 12.0 to 24.4 Å.

14 . The film according to claim 1 , wherein an impedance of the film at 10 Hz is 330 Ω or less.

15 . An electrode comprising the film according to claim 1 .

16 . The electrode according to claim 15 , wherein the electrode is constructed as a biosignal sensing electrode.

17 . The electrode according to claim 15 , wherein the electrode is constructed as an electrical stimulation electrode.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (16)