Inkjet ink, inkjet recording method and color toner composition

• US 20050074684A1
• Filed: 01/07/2004
• Published: 04/07/2005
• Est. Priority Date: 01/08/2003
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Fujiwara, Toshiki, Yabuki, Yoshiharu, Chino, Tomohiro
• Granted Patent: US 7,186,292 B2
• Time in Patent Office: Days
• US Class Current: 430/108.230
• CPC Class Codes: C09B 31/147 Pyrazoles
• CPC Class Codes: C09B 31/153 containing a six-membered ring with one nitrogen atom as the only ring hetero-atom
• CPC Class Codes: C09B 31/28 Heterocyclic compounds
• CPC Class Codes: C09D 11/328 characterised by dyes
• CPC Class Codes: G03G 9/091 Azo dyes
• CPC Class Codes: G03G 9/122 characterised by the colouring agents

Abstract

A coloring composition such as printing ink for inkjet printing or the like or electrophotographic color toner is provided, which can give a colored image or material excellent in the color hue and fastness, and also provide an inkjet recording method capable of forming an image having good color hue and high fastness to light and active gases in the environment, particularly ozone gas, and which is an inkjet ink comprising an azo dye having a specific structure containing an alkyl chain having 4 to more carbon atoms and not containing an ionic hydrophilic group; an inkjet recording method using the ink; and a color toner composition comprising the above-described azo dye.

Claims

1. An inkjet ink comprising at least one azo dye represented by the following formula (1), containing at least one alkyl chain having 4 or more carbon atoms and not containing an ionic hydrophilic group:

A-N═

N—

B—

N═

N—

C 

 

Formula (1);

wherein A, B and C each independently represents an aromatic group which may be substituted or a heterocyclic group which may be substituted, provided that A and C each is a monovalent group and B is a divalent group.

2. The inkjet ink according to claim 1, wherein the at least one azo dye is an azo dye represented by the following formula (2), containing at least one alkyl chain having 4 or more carbon atoms and not containing an ionic hydrophilic group:

A-N═

N—

B—

N═

N-Het 

 

Formula (2)

wherein A and B are the same as A and B in the formula (1), respectively, and Het represents an aromatic heterocyclic group.

3. The inkjet ink according to claim 2, wherein at least one of A and B in the formula (2) is an aromatic heterocyclic group.

4. The inkjet ink according to claim 2, wherein Het in the formula (2) is an aromatic nitrogen-containing six-membered heterocyclic group.

5. The inkjet ink according to claim 1, wherein the at least one azo dye is an azo dye represented by the following formula (3), containing at least one alkyl chain having 4 or more carbon atoms and not containing an ionic hydrophilic group:

6. The inkjet ink according to claim 5, wherein the at least one azo dye is an azo dye represented by the following formula (4), containing at least one alkyl chain having 4 or more carbon atoms and not containing an ionic hydrophilic group:

7. The inkjet ink according to claim 6, wherein the at least one azo dye is an azo dye represented by the following formula (6), containing at least one alkyl chain having 4 or more carbon atoms and not containing an ionic hydrophilic group:

8. The inkjet ink according to claim 1, wherein the total carbon atom number of all alkyl chains having 4 or more carbon atoms in the at least one azo dye is 12 or more.

9. An inkjet recording method comprising forming an image on an image-receiving material by using the ink-jet ink claimed in claim 1, in which said image-receiving material comprises a support and an ink-accepting layer containing an inorganic white pigment particle.

10. A color toner composition comprising at least one azo dye described in claim 1.