Rub-resistant inkjet composition

Patent metadata

Field	Value
Publication number	US-10858528-B2
Application number	US-201615774006-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Dec 23, 2015
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

Provided herein is an ink immobilizing composition that includes colloidal wax particles and a property-adjusting agent, being capable of causing immobilization of a property-sensitive ink composition upon contact therebetween on the surface of a substrate, as well as a process of printing a rub-resistant image, a kit for printing a rub-resistant image, and a substrate having a rub-resistant image printed thereon.

First claim

What is claimed is:

1. An immobilizing composition for direct inkjet printing an image on a fabric substrate, comprising a plurality of wax particles, a surfactant, a property-adjusting agent and an immobilizing composition carrier, said property-adjusting agent lowers a pH level at a surface of the fabric substrate, thereby effecting immobilization of an ink composition upon contacting said ink composition with the immobilizing composition on said surface, the composition is substantially devoid of a colorant, and having a pH that ranges from 3 to 6, and suitable for direct inkjet printing, wherein:
said property-adjusting agent is substantially eliminated upon heating to at least 120° C., and
said wax particles impart at least 60% colorfastness to rubbing to the image on the fabric substrate.

2. The immobilizing composition of claim 1 , wherein an average size of said particles ranges from 0.1 microns to 10 microns.

3. The immobilizing composition of claim 1 , wherein a solid contents of said wax particles ranges from 0.1% to 4% of the total weight of the composition.

4. The immobilizing composition of claim 1 , being for application from a nozzle is characterized by at least one of:
a maximal particle size of less than 15 micron;
a dynamic viscosity at shear that ranges from 2 to 4 (N·s)/m 2 ;
a room temperature Brookfield viscosity less than 3 centipoises;
a surface tension that ranges from 24 to 26 N/m; and
an electrical resistance of 50 to 2000 ohm per centimeter.

5. The immobilizing composition of claim 1 , being for application from a printhead is characterized by at least one of:
a maximal particle size of less than 10 microns;
a dynamic viscosity at shear that ranges from 8 to 20 (N·s)/m 2 ;
a room temperature Brookfield viscosity less than 25 centipoises;
a surface tension that ranges from 24 to 32 N/m; and
an electrical resistance of 50 to 2000 ohm per centimeter.

6. The immobilizing composition of claim 1 , wherein said surfactant is a cationic surfactant.

7. The immobilizing composition of claim 1 , wherein said wax is an oxidized polyethylene wax.

8. The immobilizing composition of claim 1 , wherein said property-adjusting agent is an acid.

9. The immobilizing composition of claim 8 , wherein said acid is an organic acid.

10. The immobilizing composition of claim 8 , wherein said acid is a transitory acid.

11. The immobilizing composition of claim 8 , wherein said acid is an acidic polymer.

12. The immobilizing composition of claim 1 , wherein said ink composition comprises a colorant, a property-sensitive agent and an ink composition carrier.

13. An inkjet printing kit comprising the immobilizing composition of claim 1 and an ink composition, wherein said ink composition comprises a colorant, a property-sensitive agent and an ink composition carrier, and suitable for direct inkjet printing.

14. The kit of claim 13 , wherein each of said immobilizing composition and said ink composition are packaged separately in a packaging material.

15. The kit of claim 14 , wherein the immobilizing composition is identified in print, in or on said packaging material, for use in immobilizing said ink composition upon contacting said ink composition.

16. A process of printing an image directly on a substrate, comprising contacting at least a portion of the substrate with the immobilizing composition of claim 1 , and applying an ink composition on said portion of the substrate, thereby printing the image, wherein said ink composition comprises a colorant, a property-sensitive agent and an ink composition carrier.

17. The process of claim 16 , wherein said immobilizing composition and said ink composition are each individually applied on said portion of the substrate by a separate applicator.

18. The process of claim 17 , wherein said immobilizing composition is applied by a nozzle.

19. The process of claim 17 , wherein said ink composition is applied by an inkjet printhead.

20. The process of claim 16 , wherein said ink composition is applied on said substrate while said substrate is still wet with said immobilizing composition.

21. The process of claim 16 , further comprising curing the image subsequent to said applying said ink composition.

22. A substrate having an image printed thereon, wherein the image is in the form of a film attached to the substrate and said film is formed directly on the substrate by contacting the substrate with the immobilizing composition of claim 1 , and applying said ink composition on the substrate, thereby forming the image.

Assignees

• Kornit Digital Ltd

Inventors

• Iraqi Muhammad
• Mozel Jacob

Classifications

• D06P1/5221

  Polymers of unsaturated hydrocarbons, e.g. polystyrene polyalkylene · CPC title

• D06P1/6533

  Aliphatic, araliphatic or cycloaliphatic · CPC title

• B41M5/0017

  Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying · CPC title

• C09D11/102

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

• C09D11/54 Primary

  Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink · CPC title