US10870766B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10870766-B2 |
| Application number | US-201515114466-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 29, 2015 |
| Priority date | Jan 31, 2014 |
| Publication date | Dec 22, 2020 |
| Grant date | Dec 22, 2020 |
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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 %.
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The invention claimed is: 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. 2. 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. 3. 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 %. 4. 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. 5. 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. 6. 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. 7. The carbon nanotube dispersion liquid of claim 1 , wherein the carbon nanotubes (A) are single-walled carbon nanotubes.
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