INK COMPOSITION

• US 20160002480A1
• Filed: 08/24/2015
• Published: 01/07/2016
• Est. Priority Date: 03/07/2013
• Status: Active Grant

• Current Assignee: Océ-Technologies B.V. (Canon Inc.)
• Original Assignee: Océ-Technologies B.V. (Canon Inc.)
• Inventors: VAN HAMEREN, Richard, GROOTHUIJSE, Ronald, MARKIES, Peter R., LEENEN, Mark A.M., HOEIJMAKERS, Mark
• Granted Patent: US 9,616,676 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B41J 2/2107 characterised by the ink properties supplying ink in a solid state B41J2/17593
• CPC Class Codes: C09D 11/104 Polyesters
• CPC Class Codes: C09D 11/106 containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 11/14 based on carbohydrates
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/36 based on non-aqueous solvents
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes

Abstract

The invention relates to an ink composition comprising a water-dispersed resin a water dispersible colorant and water and wherein the ink composition further comprises a co-solvent, wherein the co-solvent is selected from the group consisting of saccharides and co-solvents comprising a ring structure, wherein the ring structure comprises a 5-membered, a 6-membered or a 7-membered ring. Additionally, the ink composition comprises a cyclodextrin compound.

The invention further relates to a method for preparing such ink compositions and to a method for applying an image onto a receiving medium using such ink composition.

Claims

1. An ink composition comprising

a water-dispersed resin;

a water dispersible colorant;

a cyclodextrin compound;

water;

a co-solvent;

wherein the water-dispersed resin is present in an amount of 3.5 wt % or more, based on the total weight of the ink composition, wherein the water-dispersed resin is present in an amount of 80 wt % or more based on the amount of the cyclodextrin component, and wherein the co-solvent is selected from the group consisting of;

saccharides and co-solvents comprising a ring structure, wherein the ring structure comprises a 5-membered, a 6-membered or a 7-membered ring.

2. Ink composition according to claim 1, wherein the cyclodextrin compound is a β

-cyclodextrin compound.

3. Ink composition according to claim 1 wherein the co-solvent and the cyclodextrin are present in a molar ratio of from 1:

20 to 20;

1.

4. Ink composition according to claim 2, wherein the water dispersed-resin is compatible with the co-solvent and the cyclodextrin compound.

5. Ink composition according to claim 1, wherein the co-solvent is a saccharide.

6. Ink composition according to claim 5, wherein the saccharide is selected from the group consisting of a mono-saccharide, a disaccharide and a trisaccharide.

7. Ink composition according to claim 4, wherein the co-solvent is isosorbide.

8. Ink composition according to claim 1, wherein the co-solvent is 2-pyrrolidone.

9. Method for preparing an ink composition according to claim 1, the method comprising the steps of:

providing water;

adding a co-solvent upon stirring, wherein the co-solvent is selected from the group consisting of saccharides and co-solvents comprising a ring structure, wherein the ring structure comprises a 5-membered, a 6-membered or a 7-membered ring;

adding a cyclodextrin compound upon stirring;

adding an aqueous dispersion of the water dispersed resin and an aqueous dispersion of the water dispersible colorant, wherein the water-dispersed resin is present in an amount of 80 wt % or more based on the amount of the cyclodextrin component.

10. Method for applying an image onto a receiving medium by applying droplets of an ink composition according to claim 1 onto the receiving medium, the method comprising the step of:

applying droplets of the ink composition onto the receiving medium in a predefined pattern.