INKJET DYES EXHIBITING REDUCED KOGATION

• US 20100003470A1
• Filed: 05/14/2009
• Published: 01/07/2010
• Est. Priority Date: 07/03/2008
• Status: Active Grant

• Current Assignee: BASF SE
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Silverbrook, Kia, Indusegaram, Sutharsiny, Vonwiller, Simone Charlotte, Ridley, Damon Donald, Gonzaga, Graciel
• Granted Patent: US 8,029,611 B2
• Time in Patent Office: Days
• US Class Current: 428/195.1
• CPC Class Codes: B41J 2/1404 Geometrical characteristics
• CPC Class Codes: B41J 2002/14475 characterised by nozzle shapes or number of orifices per chamber
• CPC Class Codes: B41J 2202/03 Specific materials used
• CPC Class Codes: C09B 47/04 Phthalocyanines abbreviation: Pc
• CPC Class Codes: C09B 47/065 having -COOH or -SO3H radicals or derivatives thereof, directly linked to the skeleton
• CPC Class Codes: C09B 47/0678 having-COOH or -SO3H radicals or derivatives thereof directly linked to the skeleton
• CPC Class Codes: C09B 47/24 Obtaining compounds having —COOH or —SO3H radicals, or derivatives thereof, directly bound to the phthalocyanine radical
• CPC Class Codes: C09B 69/04 of anionic dyes with nitrogen containing compounds
• CPC Class Codes: C09D 11/328 characterised by dyes
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Abstract

A salt of a sulfonated dye comprising an ammonium cation as a counterion. The ammonium cation comprises at least 3 hydroxyl groups. The salt is useful in reducing kogation in thermal inkjet printheads. One example of these salts is the compound of formula (II):

wherein M is Ga(OH); and each of Z₁⁺, Z₂⁺, Z₃⁺ and Z₄⁺ is protonated 2,2-bis(hydroxymethyl)-2,2′,2″-nitrilotriethanol.

Claims

1. A salt of a sulfonated dye comprising at least one ammonium cation as a counterion, wherein the or each ammonium cation comprises at least 3 hydroxyl groups.

2. The salt of claim 1, wherein the ammonium cation comprises at least 4 hydroxyl groups.

3. The salt of claim 1, wherein the ammonium cation comprises at least 5 hydroxyl groups.

4. The salt of claim 1, wherein the ammonium cation is of formula (A):

5. The salt of claim 1, wherein the ammonium cation is selected from the group consisting of:

protonated triethanolamine; and

protonated 2,2-bis(hydroxymethyl)-2,2′

,2″

-nitrilotriethanol.

6. The salt of claim 1, wherein said dye is a sulfonated phthalocyanine dye.

7. The salt of claim 1, wherein said dye is an IR-absorbing dye.

8. The salt of claim 1, which is of formula (I):

9. The salt of claim 1, which is of formula (II):

10. The salt of claim 9, wherein at least three of Z₁⁺, Z₂⁺, Z₃⁺ and Z₄⁺ are said ammonium cation.

11. An inkjet ink comprising a salt according to claim 1.

12. A method of reducing kogation in an inkjet printhead, said method comprising:

printing from the printhead using an inkjet ink according to claim 10.

13. The method of claim 12, wherein said printhead comprises a plurality of nozzles, each nozzle comprising:

a nozzle chamber containing said ink;

a heater element for heating said ink; and

a nozzle opening for ejection of ink.

14. The method of claim 13, wherein said heater element is comprised of titanium nitride or a nitride of a titanium alloy.

15. The method of claim 14, wherein said heater element is comprised of titanium aluminium nitride.

16. The method of claim 13, wherein said heater element is a cantilever beam suspended across said nozzle chamber.

17. The method of claim 12, wherein said printing includes at least 50 million drop actuations.

18. An inkjet printhead comprising a plurality of nozzles, each nozzle comprising:

a nozzle chamber containing an inkjet ink according to claim 9;

a heater element for heating said ink; and

a nozzle opening for ejection of ink.

19. The inkjet printhead of claim 18, wherein said heater element is comprised of titanium aluminium nitride.

20. A substrate having a salt according to claim 1 disposed thereon or therein.