Discrete ink particle with solid phase and liquid phase

• US 8,299,140 B2
• Filed: 12/21/2007
• Issued: 10/30/2012
• Est. Priority Date: 12/21/2007
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Nair, Mridula
• Primary Examiner(s): Choi, Ling
• Assistant Examiner(s): Mesh, Gennadiy
• Application Number:
  US11/962,480
• Publication Number:
  US 20090162775A1
• Time in Patent Office: 1,775 Days
• Field of Search: 523/160, 430/111.4, 430/109.3, 430/137.1, 430/137.15, 430/137.17, 430/108.21
• US Class Current: 523/160
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium
• CPC Class Codes: G03G 9/0819 characterised by the dimensions of the particles
• CPC Class Codes: G03G 9/0825 characterised by their structure; characterised by non-homogenuous distribution of components microcapsular toners G03G9/093

Abstract

The present invention is an ink comprising a solid phase and a liquid phase wherein the solid phase comprises a polymeric binder and the liquid phase comprises oil and a pigment, the solid phase and the liquid phase forming a discrete particle having multiple domains of the liquid phase.

Claims

1. An ink comprising:

a discrete ink polymer particle comprising a solid phase and a liquid phase wherein the solid phase comprises a polymeric binder and the liquid phase comprises an oil that does not solubilize the solid phase and a pigment, the solid phase and the liquid phase forming the discrete ink polymer particle having multiple domains of the liquid phase contained within the solid phase.

2. The ink of claim 1 wherein the solid phase fluffier comprises waxes, shape control agents, and charge control agents.

3. The ink of claim 1 wherein the polymeric binder is selected from the group consisting of polyesters, polymers of styrenes, monoolefins, vinyl chloride, vinyl esters, methylene aliphatic monocarboxylic acid esters, vinyl ethers, and vinyl ketones.

4. The ink of claim 1 wherein the discrete ink polymer particle has a size of from 2 to 50 microns.

5. The ink of claim 1 wherein the oil is selected from the group consisting of aliphatic hydrocarbons, cycloaliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbon solvents, silicone oils paraffinic solvent blends, and aliphatic hydrocarbon solvent blends.

6. The ink of claim 1 wherein the oil comprises soybean oil or petroleum hydrocarbon.

7. The ink of claim 1 wherein the liquid phase further comprises a microgel.

8. The ink of claim 1 wherein the pigment is selected from the group consisting of carbon black, aniline blue, calcoil blue, chrome yellow, ultramarine blue, DuPont oil red, quinoline yellow, methylene blue chloride, phthalocyanine blue, malachite green oxalate, lamp black, rose bengal, C.I. Pigment Red 48:

1, C.I. Pigment Red 122, C.I. Pigment Red 57;

1, C.I. Pigment Yellow 97, C.I. Pigment Yellow 12, C.I. Pigment Yellow 17, C.I. Pigment Blue 15;

1, and C.I. Pigment Blue 15;

3.

9. The ink of claim 1 wherein the discrete polymer particle comprises a dry toner particle.

10. The ink of claim 9 wherein the toner particle further comprises at least one of charge control agents, spacing agents, and release agents.

11. A dry electrophotographic toner comprising:

a plurality of discrete toner particles, each comprising;

a solid phase portion comprising a polymeric binder, and a liquid phase portion comprising an oil that does not solubilize the solid phase and a pigment contained within a plurality of separate domains formed within the polymeric binder.

12. The dry electrophotographic toner of claim 11 wherein each separate domain comprises a pocket in the polymeric binder and containing the oil and pigment separated from other pockets and the surface of the toner particle by the solid phase portion.

13. The dry electrophotographic toner of claim 12 wherein the pockets contain substantially all the oil and pigment in the dry electrophotographic toner to ensure that the entire liquid phase portion of each toner particle is not released by breakage of a container of dry electrophotographic toner.

14. The dry electrophotographic toner of claim 11 wherein the toner particle has a size of between about 2 to 50 microns.

15. The dry electrophotographic toner of claim 11 wherein the plurality of separate domains are of any size smaller than the solid phase portion.

16. The dry electrophotographic toner of claim 11 wherein the plurality of separate domains are of any shape.

17. The dry electrophotographic toner of claim 11 wherein the solid phase portion having a reduction in sphericity forming an irregular shape.

18. The dry electrophotographic toner of claim 11 wherein the pigment is selected from the group consisting of carbon black, aniline blue, calcoil blue, chrome yellow, ultramarine blue, DuPont oil red, quinoline yellow, methylene blue chloride, phthalocyanine blue, malachite green oxalate, lamp black, rose bengal, C.I. Pigment Red 48:

1, C.I. Pigment Red 122, C.I. Pigment Red 57;

1, C.I. Pigment Yellow 97, C.I. Pigment Yellow 12, C.I. Pigment Yellow 17, C.I. Pigment blue 15;

1, and C.I. Pigment blue 15;

3.

19. The dry electrophotographic toner of claim 11 wherein the discrete toner particle comprises a dry toner particle.