Ink compositions for inkjet printing

Abstract

The objective of the present invention is to provide an ink that exhibits fast drying properties in combination with a long decapping time and good latency. [Solution] An ink composition, particularly an inkjet ink composition for use in inkjet printing such as drop-on-demand inkjet printing or continuous inkjet printing, is provided, which is suitable for generating codes on a non-porous substrate. This ink composition is C 1~6 Alcohol solvent, C 3~12 The ink composition comprises an ester solvent, a siloxane surfactant, and a capping resin selected from rosin resins and terpene phenol resins. This ink composition has a short drying time, combined with a long decapping time and / or good latency.

Claims

1. C 1～6 Alcohol solvent, C 3～12 An ink composition comprising an ester solvent, a siloxane surfactant, and a capping resin selected from rosin resins and terpene phenol resins.

2. The ink composition according to claim 1, wherein the siloxane surfactant has a random structure, a block structure, a comb-shaped structure, or a star-shaped structure.

3. The ink composition according to claim 1 or 2, wherein the siloxane surfactant is a polyether-modified siloxane surfactant.

4. The ink composition according to any one of claims 1 to 3, wherein a siloxane surfactant is present in an amount of 0.1 to 1.5% by mass.

5. The ink composition according to any one of claims 1 to 4, wherein the capping resin is hydrophobic.

6. The ink composition according to any one of claims 1 to 5, wherein the capping resin is selected from pentaerythritol rosin resin, esters of hydrogenated rosin such as glycerol ester hydrogenated rosin resin, hydrogenated terpene phenol resin, or terpene phenol resin produced by copolymerization of terpenes such as α-pinene, β-pinene, and d-limonene with phenol or bisphenol.

7. C 1～6 The ink composition according to any one of claims 1 to 6, wherein alcohol is present in the composition at an amount of 70 to 90% by mass relative to the total mass of the ink composition.

8. C 1～6 The ink composition according to any one of claims 1 to 7, wherein the alcohol solvent has a boiling point of 60 to 120°C at a pressure of 1.0 bar.

9. C 1～6 Alcohol solvents, two or more C 1～6 An ink composition according to any one of claims 1 to 8, which is a mixture of alcohols.

10. C 3～12 The ink composition according to any one of claims 1 to 9, wherein an ester solvent is present in the composition at an amount of 0.5 to 8% by mass relative to the total mass of the ink composition.

11. C 3～12 The ink composition according to any one of claims 1 to 10, wherein the ester solvent has a boiling point of 100 to 200°C at a pressure of 1.0 bar.

12. The ink composition according to any one of claims 1 to 11, further comprising a polysorbate surfactant.

13. The ink composition according to claim 12, wherein the polysorbate surfactant is present in an amount of 0.5 to 1.5% by mass relative to the total mass of the ink composition.

14. The ink composition according to claim 12 or 13, wherein the polysorbate surfactant has a molecular weight such as 1,200 to 2,000 mass average molecular weight (Mw).

15. The ink composition according to any one of claims 1 to 14, further comprising a binder such as cellulose resin.

16. The ink composition according to claim 15, wherein the binder comprises one or more polymers having one or more coordination groups selected from hydroxyl, carboxyl, and amino.

17. The ink composition according to any one of claims 1 to 16, further comprising a metal crosslinking agent.

18. A printing method comprising the steps of providing an ink composition according to any one of claims 1 to 17, and depositing the ink composition onto a substrate, and optionally including the step of drying the deposited composition.

19. An ink cartridge comprising the composition according to any one of claims 1 to 17.

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