Ink composition

Patent metadata

Field	Value
Publication number	US-9328252-B2
Application number	US-201514846337-A
Country	US
Kind code	B2
Filing date	Sep 4, 2015
Priority date	Mar 7, 2013
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

The invention relates to an ink composition comprising a pigment, an aqueous vehicle, a host compound having a cavity and a surface active agent, wherein the surface active agent is capable of binding to the cavity of the host 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 jet composition for applying an image onto a receiving medium, said receiving medium comprising a hydrophobic surface, the ink jet ink composition comprising:
a pigment;
an aqueous vehicle;
a host compound, which is a cyclodextrine compound, is soluble or dispersible in the aqueous vehicle and has a cavity capable of hosting a guest compound;
a surface active agent, having a first part and a second part, wherein the first part has an affinity towards the cavity of the host compound and is capable of forming a host-guest complex with the host compound and wherein the second part has a hydrophobic character and an affinity towards the hydrophobic surface of the receiving medium, wherein the affinity of the second part towards the hydrophobic surface of the receiving medium is higher than the affinity of the first part towards the cavity of the host compound, and
wherein the surface active agent is an alkylphenolethoxylate and wherein the alkyl group of the alkylphenolethoxylate ahs 6-30 carbon atoms.

2. The ink jet ink composition according to claim 1 , wherein the ink jet ink composition further comprises a water dispersible resin.

3. A method for providing an image onto a receiving medium, the surface of the medium having a hydrophobic character, the method comprising the step of:
applying droplets of the ink jet ink composition according to claim 1 onto the hydrophobic surface of the receiving medium in a predefined pattern.

4. A method for preparing the ink jet ink composition according to claim 1 , the method comprising the steps of:
providing an aqueous vehicle;
adding the host compound, which is a cyclodextrine compound, is soluble or dispersible in the aqueous vehicle and has a cavity capable of hosting a guest compound, upon stirring;
adding a surface active agent upon stirring, the surface active agent, having a first part and a second part, wherein the first part has an affinity towards the cavity of the host compound and is capable of forming a host-guest complex with the host compound and wherein the second part has a hydrophobic character and an affinity towards the hydrophobic surface of the receiving medium, wherein the affinity of the second part towards the hydrophobic surface of the receiving medium is higher than the affinity of the first part towards the cavity of the host compound;
adding an aqueous dispersion of the water dispersible colorant upon stirring, and
wherein the surface active agent is an alkylpjhenolethoxylate and wherein the alkyl group of the alkylphenolethoxylate has 6-30 carbon atoms.

Assignees

• Oce Tech Bv

Inventors

• Van Hameren Richard

Classifications

• C09D11/322

  Pigment inks · CPC title

• C09D11/14

  based on carbohydrates · CPC title

• C09D11/38 Primary

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

• C09D103/02

  Starch; Degradation products thereof, e.g. dextrin · CPC title

• C09D175/06

  from polyesters · CPC title