Inkjet ink, ink set, and image recording method

Abstract

The present application provides a kind of inkjet ink, ink set and image recording method capable of recording image with excellent concealment and capable of inhibiting wear and tear degradation of inkjet head.The inkjet ink contains water, titanium dioxide particles and silicon compound, the average primary particle size of titanium dioxide particles is 100 nm or more, the silicon compound is at least one selected from the group consisting of silicate and colloidal silicon dioxide, the content of silicon compound is 0.0020 mass% or more relative to the total amount of titanium dioxide particles, and the ratio of volume average particle size of colloidal silicon dioxide to the average primary particle size of titanium dioxide particles is 0.04 or less.

Claims

1. An ink assembly comprising: White ink as inkjet ink; and Colored inks containing water and colored pigments, wherein The inkjet ink contains water, titanium dioxide particles, and silicon compounds. The average primary particle size of the titanium dioxide particles is greater than 100 nm. The silicon compound is at least one selected from the group consisting of silicates and colloidal silica. The content of the silicon compound relative to the total amount of the titanium dioxide particles is 0.0020% by mass or more. The ratio of the volume average particle size of the colloidal silica to the average primary particle size of the titanium dioxide particles is less than 0.

04. When the silicon compound contained in the white ink is used as the first silicon compound, The colored ink further contains at least one second silicon compound selected from the group consisting of silicates and colloidal silica. When the content of the first silicon compound is X1% by mass relative to the total amount of the white ink, and the content of the second silicon compound is X2% by mass relative to the total amount of the colored ink, the X1 / X2 ratio is less than 1.

0.

2. The ink assembly according to claim 1, wherein, The content of the silicon compound is 0.040% to 2.0% by mass relative to the total amount of the titanium dioxide particles.

3. The ink set according to claim 1 or 2, wherein, When the silicon compound contained in the white ink is used as the first silicon compound, The colored ink further contains at least one second silicon compound selected from the group consisting of silicates and colloidal silica. The first silicon compound comprises a silicate. The second silicon compound comprises colloidal silicon dioxide.

4. The ink group according to claim 1 or 2, further comprising a pretreatment liquid containing water and a coagulant.

5. The ink group according to claim 3, further comprising a pretreatment liquid containing water and a coagulant.

6. An image recording method, comprising: The colored ink application process involves using the ink set according to any one of claims 1 to 5 to spray the colored ink from an inkjet head and apply it to a non-permeable substrate; and In the white ink application process, the white ink is ejected from the ink jet head using the ink set and applied to the area of ​​the non-permeable substrate that has been coated with the colored ink.

7. The image recording method according to claim 6, further comprising, prior to the color ink application step, an application step of a pretreatment solution containing water and a coagulant to the non-permeable substrate, wherein the pretreatment solution is applied to the non-permeable substrate. In the colored ink application process, the colored ink is applied to the area on the non-permeable substrate that has been treated with the pretreatment liquid.

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