Palladium ink compositions

• US 9,217,093 B1
• Filed: 05/30/2014
• Issued: 12/22/2015
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Wu, Yiliang, Abraham, Biby Esther
• Primary Examiner(s): NGUYEN, LAMSON D
• Application Number:
  US14/292,614
• Publication Number:
  US 20150344714A1
• Time in Patent Office: 571 Days
• US Class Current: 1/1
• CPC Class Codes: C08K 5/0091 Complexes with metal-heteroatom-bonds
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/36 based on non-aqueous solvents
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes
• CPC Class Codes: C09D 11/52 Electrically conductive inks

Abstract

An ink includes a palladium salt, an organic amine that forms a palladium complex from the palladium salt, and, at least one solvent, the solvent has a boiling point at about the decomposition temperature of the palladium complex.

Claims

1. An ink comprising:

a palladium salt;

an organic amine that forms a palladium complex from the palladium salt; and

at least one solvent;

wherein the at least one solvent has a boiling point at about the decomposition temperature of the palladium complex.

2. The ink of claim 1, wherein the palladium salt is palladium acetate.

3. The ink of claim 1, wherein the organic amine is an aliphatic amine having 7 to 18 carbon atoms.

4. The ink of claim 1, wherein the organic amine is an aliphatic amine having 7 to 9 carbon atoms.

5. The ink of claim 1, wherein the organic amine is n-octylamine.

6. The ink of claim 1, wherein the palladium complex is a liquid at about 30°

C.

7. The ink of claim 1, wherein the solvent has a boiling point between about 140°

C. to about 220°

C.

8. The ink of claim 1, wherein the solvent is selected from the group consisting of t-butylbenzene, iso-butylbenzene, m-xylene, pentylbenzene, ethylbenzene, propylbenzene, tri methylbenzene, methyl ethyl benzene, diethylbenzene, methyl propylbenzene, and mixtures thereof.

9. The ink of claim 1, wherein the ink is a particle-free Newtonian fluid.

10. The ink of claim 1, wherein the ink has a viscosity in a range from about 5 cps to about 30 cps at about 40°

C.

11. A method comprising:

depositing an image with an ink on a substrate, the ink comprising;

a palladium salt;

an organic amine that forms a palladium complex from the palladium salt; and

at least one solvent;

wherein the at least one solvent has a boiling point at about a decomposition temperature of the palladium complex; and

heating the deposited image to the decomposition temperature of the palladium complex, wherein the deposited image is substantially preserved during heating without bulging or de-wetting.

12. The method of claim 11, the depositing step is carried out by inkjet printing.

13. The method of claim 11, further comprising annealing the image at a temperature in a range from about 200°

C. to about 250°

C.

14. The method of claim 11, wherein the image is a printed circuit.

15. The method of claim 11, wherein the organic amine is an aliphatic amine having 7 to 9 carbon atoms.

16. The method of claim 11, wherein the organic amine is n-octylamine.

17. The method of claim 11, wherein the solvent has a boiling point between about 140°

C. to about 220°

C.

18. The method of claim 11, wherein the heating step generates palladium nanoparticles.

19. The method of claim 18, wherein the nanoparticles are annealed to form palladium layer.

20. An ink formulation comprising:

palladium acetate;

n-octylamine; and

a hydrocarbon solvent having a boiling point from about 140°

C. to about 180°

C.