Carbon nanotube dispersion and preparation method thereof

{
  "publication_number": "US2026103382A1",
  "country": "US",
  "kind": "A1",
  "title": "Carbon nanotube dispersion and preparation method thereof",
  "abstract": "The present invention relates to a carbon nanotube dispersion and a preparation method thereof, wherein the carbon nanotube dispersion includes carbon nanotubes, a first dispersant which is carboxyalkyl cellulose having a weight average molecular weight of 9,000 g/mol or less, a second dispersant which is polyvinyl butyral (PVB), and a solvent, and the carbon nanotube dispersion of the present invention has a low initial viscosity and a low viscosity change rate, and thus, is excellent in storage stability and processability.",
  "claims": [
    "1. A carbon nanotube dispersion comprising: carbon nanotubes; a first dispersant; a second dispersant; and a solvent, wherein: the first dispersant is carboxyalkylcellulose having a weight average molecular weight of 9,000 g/mol or less; the second dispersant is polyvinyl butyral (PVB); and a weight ratio between the first dispersant and the second dispersant is 1:2.5 to 1:10. 2. The carbon nanotube dispersion of claim 1, wherein a combined content of the first dispersant and the second dispersant is 50 parts by weight to 700 parts by weight based on 100 parts by weight of the carbon nanotubes. 3. The carbon nanotube dispersion of claim 1, wherein a content of the first dispersant is 0.1 wt % to 5 wt % based on a total weight of the dispersion. 4. The carbon nanotube dispersion of claim 1, wherein a content of the second dispersant is 0.1 wt % to 5 wt % based on a total weight of the dispersion. 5. The carbon nanotube dispersion of claim 1, wherein a content of the carbon nanotubes is 5 wt % or less based on a total weight of the dispersion. 6. The carbon nanotube dispersion of claim 1, wherein the first dispersant is carboxymethyl cellulose (CMC) or carboxyethyl cellulose (CEC). 7. The carbon nanotube dispersion of claim 1, wherein the first dispersant has an average molecular weight of 2,000 g/mol to 8,000 g/mol. 8. The carbon nanotube dispersion of claim 1, wherein the second dispersant has a unit content of vinyl alcohol of 10 wt % to 22 wt % in the polyvinyl butyral. 9. The carbon nanotube dispersion of claim 1, wherein the second dispersant has an average molecular weight of 20,000 g/mol or less. 10. A method for preparing a carbon nanotube dispersion of claim 1, the method comprising: (S 10) mixing carbon nanotubes, a first dispersant, a second dispersant, and a solvent to provide a mixture; and (S 20) dispersing the mixture. 11. The method of claim 10, wherein Step (S 20) above comprises (S 21) stirring for 30 minutes or more at a rate of 5.000 rpm to 10.000 rpm."
  ],
  "cpc": [
    "C01B 32/174",
    "C01B 2202/22"
  ],
  "filing_date": "2024-04-04",
  "publication_date": "2026-04-16",
  "priority_date": "2023-04-05",
  "application_number": "US-202419117198-A"
}