# US 10,870,766 B2 · Carbon nanotube dispersion liquid, conductor film, and conductive film

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- Number: US 10,870,766 B2
- Document ID: US10870766B2
- Status: Granted
- Kind: B2
- Application number: 15/114,466
- Filed: 2015-01-29
- Published: 2016-11-24
- Granted: 2020-12-22
- Earliest claimed: 2014-01-31
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Akihiko Yoshiwara; Kiyoshige Kojima; Yasuo Mukunoki; Akihiro Kojima; Masashi Ikegami
- Web page: https://patentgrep.com/patent/US10870766B2

## CPC

- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- C01B 32/174: Derivatisation; Solubilisation; Dispersion in solvents
- C08L 25/18: Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
- C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D 7/40: Additives
- C09D 7/45: Anti-settling agents
- C09D 133/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof
- C09D 133/08: Homopolymers or copolymers of acrylic acid esters
- C09D 133/10: Homopolymers or copolymers of methacrylic acid esters
- C09D 135/02: Homopolymers or copolymers of esters (C09D135/06, C09D135/08 take precedence)
- C09D 141/00: Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur; Coating compositions based on derivatives of such polymers
- H01B 1/04: mainly consisting of carbon-silicon compounds, carbon or silicon
- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- C08K 3/041: {Carbon nanotubes}
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided is a carbon nanotube dispersion liquid that has excellent stability and that can be used to form a conductor film that exhibits excellent adhesiveness to a substrate. The carbon nanotube dispersion liquid contains carbon nanotubes (A), a polymeric dispersant (B) including a sulfonic acid group-containing monomeric unit and an ethylenically unsaturated aliphatic carboxylic acid monomeric unit, and a solvent (C). Percentage content of the ethylenically unsaturated aliphatic carboxylic acid monomeric unit in the polymeric dispersant (B) is greater than 20 mol % and no greater than 90 mol %.

## Claims

### Claim 1

A carbon nanotube dispersion liquid comprising:
carbon nanotubes (A);
a polymeric dispersant (B) including a sulfonic acid group-containing monomeric unit and an ethylenically unsaturated aliphatic carboxylic acid monomeric unit;
a solvent (C); and
at least one of hydrochloric acid and nitric acid, wherein
percentage content of the ethylenically unsaturated aliphatic carboxylic acid monomeric unit in the polymeric dispersant (B) is greater than 20 mol % and no greater than 90 mol %,
the sulfonic acid group-containing monomeric unit in the polymeric dispersant (B) is a monomeric unit derived from a sulfonic acid group-containing monomer in the form of a sulfonate salt,
the ethylenically unsaturated aliphatic carboxylic acid monomeric unit in the polymeric dispersant (B) is a monomeric unit derived from at least one selected from the group consisting of a salt of acrylic acid, a salt of methacrylic acid, a salt of maleic acid, a salt of fumaric acid, and a salt of itaconic acid,
a ratio of G band peak intensity relative to D band peak intensity in a Raman spectrum of the carbon nanotubes (A) is at least 1 and no greater than 20, and wherein
the solvent (C) includes water, and
pH of the carbon nanotube dispersion liquid is at least 0.1 and no greater than 2.5.

### Claim 2 (depends on 1)

The carbon nanotube dispersion liquid of claim 1, wherein
the sulfonic acid group-containing monomeric unit in the polymeric dispersant (B) is a monomeric unit derived from a salt of an aromatic sulfonic acid.

### Claim 3 (depends on 1)

The carbon nanotube dispersion liquid of claim 1, wherein
percentage content of the sulfonic acid group-containing monomeric unit in the polymeric dispersant (B) is at least 10 mol % and less than 80 mol %.

### Claim 4 (depends on 1)

The carbon nanotube dispersion liquid of claim 1, wherein
a ratio of percentage content of the sulfonic acid group-containing monomeric unit in the polymeric dispersant (B) relative to percentage content of the ethylenically unsaturated aliphatic carboxylic acid monomeric unit in the polymeric dispersant (B) is at least 0.5 and less than 4.

### Claim 5 (depends on 1)

The carbon nanotube dispersion liquid of claim 1, wherein
the carbon nanotubes (A) include either or both of single-walled carbon nanotubes and double-walled carbon nanotubes.

### Claim 6 (depends on 1)

The carbon nanotube dispersion liquid of claim 1, wherein
an amount of the polymeric dispersant (B) per 100 parts by mass of the carbon nanotubes (A) is at least 50 parts by mass and no greater than 1,000 parts by mass.

### Claim 7 (depends on 1)

The carbon nanotube dispersion liquid of claim 1, wherein
the carbon nanotubes (A) are single-walled carbon nanotubes.