Digital offset lithography ink composition

Patent metadata

Field	Value
Publication number	US-11440311-B2
Application number	US-201815920652-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 14, 2018
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

An ink composition for use in digital offset printing including at least one component selected from the group consisting of a curable monomer and a curable oligomer; an optional dispersant; an optional photoinitiator; and at least one non-radiation curable additive, wherein the non-radiation curable additive is a detergent or an emulsifying agent, or wherein the non-radiation curable additive functions as a detergent or emulsifying agent when in the presence of a cleaning fluid, and wherein the non-radiation curable additive is a solid at a temperature of from about 20° C. to about 40° C.

First claim

The invention claimed is:

1. An ink composition for use in digital offset printing, comprising:
at least one component selected from the group consisting of a curable monomer and a curable oligomer;
an optional dispersant;
an optional photoinitiator; and
at least one non-radiation curable additive,
wherein the non-radiation curable additive is a detergent or an emulsifying agent, or wherein the non-radiation curable additive functions as a detergent or emulsifying agent when in the presence of a cleaning fluid,
wherein the non-radiation curable additive is a solid at a temperature of from about 20° C. to about 40° C., and
wherein the non-radiation curable additive is behenyl behenate or polycaprolactone-block-polytetrahydrofuran-block-polycaprolactone.

2. The ink composition of claim 1 , wherein the at least one non-radiation curable additive is a solid at a temperature of from about 20° C. to about 30° C.

3. The ink composition of claim 1 , wherein the at least one non-radiation curable additive is behenyl behenate.

4. The ink composition of claim 1 , wherein the at least one non-radiation curable additive is polycaprolactone-block-polytetrahydrofuran-block-polycaprolactone.

5. The ink composition of claim 1 , wherein the at least one non-radiation curable additive is present in the ink composition in an amount of from about 1 to about 6 percent by weight based upon the total weight of the ink composition.

6. The ink composition of claim 1 , wherein the non-radiation curable additive functions as a detergent or emulsifying agent when in the presence of a cleaning fluid, and wherein the cleaning fluid comprises a cleaning fluid of a cleaning subsystem in a digital offset printing device.

7. The ink composition of claim 1 , wherein the cleaning fluid comprises water or a combination of water and surfactant.

8. The ink composition of claim 1 , wherein the at least one component selected from the group consisting of a curable monomer and a curable oligomer is a component selected from the group consisting of acrylated polyesters, acrylated polyethers, acrylated epoxies, urethane acrylates, and pentaerythritol tetraacrylate, and combinations thereof.

9. The ink composition of claim 1 , wherein the at least one component selected from the group consisting of a curable monomer and a curable oligomer is a component selected from the group consisting of a tetrafunctional polyester acrylate oligomer, a propoxylated trimethylolpropane triacrylate monomer, and combinations thereof.

10. The ink composition of claim 1 , further comprising:
a clay.

11. A process of digital offset printing with a digital offset printing device, the process comprising:
applying an ink composition onto a re-imageable imaging member surface at an ink take up temperature, the re-imageable imaging member having dampening fluid disposed thereon;
forming an ink image;
transferring the ink image from the re-imageable surface of the imaging member to a printable substrate at an ink transfer temperature;
wherein the ink composition comprises:
at least one component selected from the group consisting of a curable monomer and a curable oligomer;
an optional dispersant;
an optional photoinitiator; and
at least one non-radiation curable additive,
wherein the non-radiation curable additive is a detergent or an emulsifying agent, or wherein the non-radiation curable additive functions as a detergent or emulsifying agent when in the presence of a cleaning fluid,
wherein the non-radiation curable additive is a solid at a temperature of from about 20° C. to about 40° C.,
wherein the non-radiation curable additive is behenyl behenate or polycaprolactone-block-polytetrahydrofuran-block-polycaprolactone.

12. The process of claim 11 , wherein the at least one non-radiation curable additive is a solid at a temperature of from about 20° C. to about 30° C.

13. The process of claim 11 , wherein the at least one non-radiation curable additive is behenyl behenate.

14. The process of claim 11 , wherein the at least one non-radiation curable additive is polycaprolactone-block-polytetrahydrofuran-block-polycaprolactone.

15. The process of claim 11 , wherein the non-radiation curable additive functions as a detergent or emulsifying agent when in the presence of a cleaning fluid, and wherein the cleaning fluid comprises a cleaning fluid of a cleaning subsystem in the digital offset printing device.

16. The process of claim 11 , wherein the cleaning fluid comprises water or a combination of water and surfactant.

17. The process of claim 11 , wherein applying the ink composition comprises applying the ink composition using an anilox delivery system.

18. The process of claim 11 , wherein the ink composition further comprises a clay.

19. A process comprising:
combining at least one component selected from the group consisting of a curable monomer and a curable oligomer; an optional dispersant; an optional photoinitiator; and at least one non-radiation curable additive wherein the non-radiation curable additive is a detergent or an emulsifying agent, or wherein the non-radiation curable additive functions as a detergent or emulsifying agent when in the presence of a cleaning fluid, wherein the non-radiation curable additive is a solid at a temperature of from about 20° C. to about 40° C., and wherein the non-radiation curable additive is behenyl behenate or polycaprolactone-block-polytetrahydrofuran-block-polycaprolactone;
optionally, heating; and
optionally, filtering;
to provide an ink composition.

20. The process of claim 19 , wherein the at least one non-radiation curable additive polycaprolactone-block-polytetrahydrofuran-block-polycaprolactone.

21. The process of claim 19 , wherein the ink composition further comprises a clay.

Assignees

• Xerox Corp

Inventors

• Allen C Geoffrey
• Moorlag Carolyn
• Magdalinis Aurelian Valeriu
• Abraham Biby Esther
• Lee Jonathan Siu-Chung

Classifications

• G03F7/027 Primary

  Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds (G03F7/075 takes precedence) · CPC title

• B41M1/06

  Lithographic printing · CPC title

• C09D11/102

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• C09D11/101 Primary

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• C09D11/023

  Emulsion inks · CPC title