Ink composition

Patent metadata

Field	Value
Publication number	US-9616676-B2
Application number	US-201514833837-A
Country	US
Kind code	B2
Filing date	Aug 24, 2015
Priority date	Mar 7, 2013
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

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

First claim

The invention claimed is:

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.

Assignees

• Oce Tech Bv

Inventors

• Van Hameren Richard
• Groothuijse Ronald
• Markies Peter R
• Leenen Mark A M
• Hoeijmakers Mark

Classifications

• C09D11/033 Primary

  characterised by the solvent · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09D11/106

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

• C09D11/322

  Pigment inks · CPC title

• C09D11/36

  based on non-aqueous solvents · CPC title