DISPERSANT FOR CARBON NANOTUBE AND COMPOSITION COMPRISING THE SAME

• US 20110237714A1
• Filed: 06/08/2011
• Published: 09/29/2011
• Est. Priority Date: 10/05/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Do Yun, YOON, Seon Mi, CHOI, Jae Young, LEE, Eun Sung
• Application Number:
  US13/155,764
• Publication Number:
  US 20110237714A1
• Time in Patent Office: Days
• US Class Current: 524/35
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C08G 61/124 with a five-membered ring containing one nitrogen atom in the ring
• CPC Class Codes: C08G 61/125 with a five-membered ring containing one oxygen atom in the ring
• CPC Class Codes: C08G 61/126 with a five-membered ring containing one sulfur atom in the ring
• CPC Class Codes: C08L 65/00 Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain C08L7/00 - C08L57/00, C08L61/00 take precedence; Compositions of derivatives of such polymers

Abstract

A dispersant for a carbon nanotube and a composition comprising the same are provided, wherein the dispersant is comprised of a structure including a head part composed of an electron-rich atom and an aromatic ring having a high affinity for the carbon nanotube and a tail part having an affinity for a dispersion medium, and thus exhibits excellent stabilizing and dispersing effects of the carbon nanotube in a variety of dispersion media including organic solvents, water or mixtures thereof. Use of the dispersant in accordance with the present invention enables convenient preparation of carbon nanotube compositions necessary for a variety of industrial fields such as emitters of field emission displays (FEDs), carbon nanotube inks, printable carbon nanotubes and the like.

Claims

1. A composition comprising:

a carbon nanotube;

a dispersion medium selected from an organic solvent, water and a mixture thereof; and

a dispersant for a carbon nanotube, the dispersant comprising;

a head part selected from the group consisting of —

SH, —

NH₂ and a group represented by Formula 1 below;

2. The composition according to claim 1, wherein the dispersant is selected from the group consisting of poly(3-hexylthiophene) (having a molecular weight of less than 10,000), 3-hexylthiophene, 3-dodecylthiophene, poly(3-pentadecylpyrrole), hexylpyrrole, dodecylpyrrole, hexylthiol, dodecanethiol, polyhexylaniline,

a compound represented by Formula 3 below:

3. The composition according to claim 1, wherein the dispersant has a molecular weight of less than 10,000.

4. The composition according to claim 1, wherein the tail part is C3-C20 polyethylene oxide or C4-C20 polypropylene oxide.

5. The composition according to claim 1, wherein the composition contains 0.001 to 10 parts by weight of a dispersant, 0.01 to 5 parts by weight of a carbon nanotube, and the balance of a dispersion medium selected from an organic solvent, water and a mixture thereof, based on 100 parts by weight of the composition.

6. The composition according to claim 1, wherein the mixing weight ratio of the carbon nanotube:

dispersant is in the range of 1;

0.001 to 1;

10.

7. The composition according to claim 1, wherein the carbon nanotube is selected from the group consisting of a single-walled carbon nanotube (SWNT), a double-walled carbon nanotube (DWNT), a multi-walled carbon nanotube (MWNT), a bundle of carbon nanotube and any combination thereof.

8. The composition according to claim 1, wherein the organic solvent is selected from the group consisting of alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol, isobutyl alcohol and diacetone alcohol;

ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone;

glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, hexylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2,4-butanetriol, 1,5-pentanediol, 1,2-hexanediol and 1,6-hexanediol;

glycol ethers such as ethylene glycol monomethyl ether and triethylene glycol monoethyl ether;

glycol ether acetates such as propylene glycol monomethyl ether acetate (PGMEA);

acetates such as ethyl acetate, butoxyethoxy ethyl acetate, butyl carbitol acetate (BCA) and dihydroterpineol acetate (DHTA);

terpineols;

trimethyl pentanediol monoisobutyrate (TEXANOL);

dichloroethene (DCE);

1-methyl pyrrolidone (NMP) and any combination thereof.

9. The composition according to claim 1, wherein the composition further contains one or more additives selected from the group consisting of an organic binder, a photosensitive monomer, a photoinitiator, a viscosity-adjusting agent, a storage stabilizer, a wetting agent and an acid or base.

10. The composition according to claim 9, wherein the content of the additives is in the range of 0.1 to 60 parts by weight, based on 100 parts by weight of the composition.

11. The composition according to claim 9, wherein the organic binder is selected from the group consisting of cellulose including ethylcellulose, styrene, styrene-acrylate copolymer, polyvinylbutyral, polyvinyl alcohol, polypropylene carbonate and any combination thereof.

12. The composition according to claim 1, wherein the composition contains 0.001 to 10 parts by weight of a dispersant, 0.01 to 5 parts by weight of a carbon nanotube, and the balance of a dispersion medium selected from an organic solvent, water and a mixture thereof, based on 100 parts by weight of the composition.

13. The composition according to claim 12, wherein the mixing weight ratio of the carbon nanotube:

dispersant is in the range of 1;

0.001 to 1;

10.

14. The composition according to claim 1, wherein the carbon nanotube is selected from the group consisting of a single-walled carbon nanotube (SWNT), a double-walled carbon nanotube (DWNT), a multi-walled carbon nanotube (MWNT), a bundle of carbon nanotube and any combination thereof.

15. The composition according to claim 2, wherein the organic solvent is selected from the group consisting of alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol, isobutyl alcohol and diacetone alcohol;

ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone;

glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, hexylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2,4-butanetriol, 1,5-pentanediol, 1,2-hexanediol and 1,6-hexanediol;

glycol ethers such as ethylene glycol monomethyl ether and triethylene glycol monoethyl ether;

glycol ether acetates such as propylene glycol monomethyl ether acetate (PGMEA);

acetates such as ethyl acetate, butoxyethoxy ethyl acetate, butyl carbitol acetate (BCA) and dihydroterpineol acetate (DHTA);

terpineols;

trimethyl pentanediol monoisobutyrate (TEXANOL);

dichloroethene (DCE);

1-methyl pyrrolidone (NMP) and any combination thereof.

16. The composition according to claim 2, wherein the composition further contains one or more additives selected from the group consisting of an organic binder, a photosensitive monomer, a photoinitiator, a viscosity-adjusting agent, a storage stabilizer, a wetting agent and an acid or base.

17. The composition according to claim 16, wherein the content of the additive is in the range of 0.1 to 60 parts by weight, based on 100 parts by weight of the composition.

18. The composition according to claim 16, wherein the organic binder is selected from the group consisting of cellulose including ethylcellulose, styrene, styrene-acrylate copolymer, polyvinylbutyral, polyvinyl alcohol, polypropylene carbonate and any combination thereof.