Ink set, inkjet recording method, and inkjet recording apparatus

Abstract

This provides an ink set that allows for the recording of images with good scratch resistance immediately after recording, while also offering good storage stability. [Solution] This ink set includes an aqueous ink, an aqueous reaction solution containing a reactant that reacts with the aqueous ink, and a liquid composition different from the reaction solution. This ink set is used in an inkjet recording method in which the aqueous ink, reaction solution, and liquid composition are ejected from an inkjet ejection head and applied to a recording medium to record an image. The liquid composition contains a crosslinking agent that can form covalent bonds with components in the aqueous ink. The aqueous ink contains resin particles that can form covalent bonds with the crosslinking agent.

Claims

1. An ink set comprising an aqueous ink, an aqueous reaction solution containing a reactant that reacts with the aqueous ink, and an aqueous liquid composition different from the reaction solution, used in an inkjet recording method for dispensing these from an inkjet ejection head and applying them to a recording medium to record an image, wherein the set comprises the aqueous ink, the reaction solution, and the liquid composition, The liquid composition contains a crosslinking agent capable of forming a covalent bond with the components in the aqueous ink, An ink set characterized in that the aqueous ink contains resin particles capable of forming covalent bonds with the crosslinking agent.

2. The ink set according to claim 1, wherein the liquid composition does not contain a colorant.

3. The ink set according to claim 1, wherein at least one of the aqueous ink, the reaction solution, and the liquid composition contains wax particles.

4. The ink set according to claim 3, wherein the wax particles are contained in at least one of the aqueous ink and the liquid composition.

5. The ink set according to claim 3, wherein the wax particles have functional groups that can form covalent bonds with the crosslinking agent.

6. The ink set according to claim 1, wherein the crosslinking agent has two or more functional groups selected from the group consisting of a carbodiimide group, an isocyanate group, and an oxazoline group.

7. The ink set according to claim 1, wherein the crosslinking agent has two or more carbodiimide groups.

8. The ink set according to claim 7, wherein the crosslinking agent has 1 mol of functional groups per molecular weight of 350 to 550.

9. The content (by mass) of the reactant in the reaction solution is 2.0% by mass or more and 30.0% by mass or less, based on the total mass of the reaction solution. The ink set according to claim 1, wherein the content (by mass) of the crosslinking agent in the liquid composition is 2.0% by mass or more and 20.0% by mass or less, based on the total mass of the liquid composition.

10. An inkjet recording method for recording an image by ejecting an aqueous ink, an aqueous reaction solution containing a reactant that reacts with the aqueous ink, and an aqueous liquid composition different from the reaction solution from an inkjet ejection head onto a recording medium, wherein The liquid composition contains a crosslinking agent capable of forming a covalent bond with the components in the aqueous ink, An inkjet recording method characterized in that the aqueous ink contains resin particles capable of forming covalent bonds with the crosslinking agent.

11. The inkjet recording method according to claim 10, wherein, among the aqueous ink, the reaction solution, and the liquid composition, the aqueous ink is applied to the recording medium first or second.

12. The inkjet recording method according to claim 10, wherein the recording medium is a film or sheet containing at least one material selected from the group consisting of polyethylene, polypropylene, nylon, polyethylene terephthalate, polyvinyl chloride, polystyrene, and metal.

13. An inkjet recording apparatus used in an inkjet recording method for recording an image by ejecting an aqueous ink, an aqueous reaction solution containing a reactant that reacts with the aqueous ink, and an aqueous liquid composition different from the reaction solution from an inkjet ejection head onto a recording medium, The liquid composition contains a crosslinking agent capable of forming a covalent bond with the components in the aqueous ink, An inkjet recording apparatus characterized in that the aqueous ink contains resin particles capable of forming covalent bonds with the crosslinking agent.

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