CARBON BLACK COMPOSITION AND USAGE THEREOF

• US 20130029183A1
• Filed: 07/27/2012
• Published: 01/31/2013
• Est. Priority Date: 07/29/2011
• Status: Abandoned Application

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation), Soitec S.A.
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: OMURA, Kazufumi
• Application Number:
  US13/560,569
• Publication Number:
  US 20130029183A1
• Time in Patent Office: Days
• US Class Current: 428/844.8
• CPC Class Codes: C08K 2201/01 Magnetic additives
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 5/17 Amines; Quaternary ammonium compounds
• CPC Class Codes: C08L 27/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C09D 11/037 characterised by the pigment
• CPC Class Codes: C09D 11/324 containing carbon black
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 5/028 Pigments; Filters
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: G11B 5/733 characterised by the addition of non-magnetic particles base layers having a non-magnetic layer under a soft magnetic layer G11B5/736; magnetic recording media substrates G11B5/739
• CPC Class Codes: G11B 5/7334 Base layer characterised by composition or structure
• CPC Class Codes: G11B 5/735 characterised by the back layer magnetic recording media substrates G11B5/739

Abstract

An aspect of the present invention relates to a carbon black composition, which comprises carbon black; an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; and at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, isophorone, and ethanol.

Claims

1. A carbon black composition, which comprises:

carbon black;

an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; and

at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, isophorone, and ethanol.

2. The carbon black composition according to claim 1, wherein the aliphatic tertiary monoamine is denoted by general formula (1):

3. The carbon black composition according to claim 2, wherein, in general formula (1), each of R¹, R², and R³ independently denotes a linear or branched alkyl group having 1 to 8 carbon atoms.

4. The carbon black composition according to claim 1, wherein the organic solvent comprises methyl ethyl ketone and/or cyclohexanone.

5. The carbon black composition according to claim 1, wherein the organic solvent comprises ethanol.

6. The carbon black composition according to claim 1, wherein the organic solvent comprises isophorone.

7. The carbon black composition according to claim 1, which comprises the carbon black in a dispersed state with a particle diameter in liquid as measured by a dynamic light scattering method of equal to or less than 70 nm with comprising no binder resin.

8. The carbon black composition according to claim 1, which further comprises a binder resin.

9. The carbon black composition according to claim 8, wherein the binder resin is selected from the group consisting of a vinyl copolymer and a polyurethane resin.

10. The carbon black composition according to claim 8, which comprises the carbon black in a dispersed state with a particle diameter in liquid as measured by a dynamic light scattering method of equal to or less than 50 nm.

11. The carbon black composition according to claim 1, which is employed as a coating composition for forming a magnetic recording medium or employed for preparation of a coating composition for forming a magnetic recording medium.

12. A carbon black-containing coating film, which has been obtained by drying a carbon black composition, the carbon black composition comprising:

carbon black;

an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; and

at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, isophorone, and ethanol.

13. A magnetic recording medium comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, which comprises a carbon black-containing coating film obtained by drying a carbon black composition, the carbon black composition comprising:

carbon black;

an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; and

at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, isophorone, and ethanol.

14. The magnetic recording medium according to claim 13, wherein the carbon black-containing coating film is a nonmagnetic layer positioned between the nonmagnetic support and the magnetic layer.

15. The magnetic recording medium according to claim 13, wherein the carbon black-containing coating film is a backcoat layer positioned on a surface of the nonmagnetic support opposite from a surface on which the magnetic layer is positioned.

16. The magnetic recording medium according to claim 13, wherein the aliphatic tertiary monoamine is denoted by general formula (1):

17. The magnetic recording medium according to claim 16, wherein, in general formula (1), each of R¹, R², and R³ independently denotes a linear or branched alkyl group having 1 to 8 carbon atoms.

18. The magnetic recording medium according to claim 13, wherein the organic solvent comprises methyl ethyl ketone and/or cyclohexanone.

19. The magnetic recording medium according to claim 13, wherein the carbon black composition further comprises a binder resin.

20. The magnetic recording medium according to claim 19, wherein the binder resin is selected from the group consisting of a vinyl copolymer and a polyurethane resin.