Digital print with water-based ink

Patent metadata

Field	Value
Publication number	US-10071563-B2
Application number	US-201715428582-A
Country	US
Kind code	B2
Filing date	Feb 9, 2017
Priority date	Jan 31, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

Water-based ink including a pigment mix and a method to form a digital print on a substrate with a pigment mix comprising large pigments and a Piezo ink head equipped with an ink circulation system, the method including: providing a water-based ink including an aqueous pigment mix including settling pigments, a binder including an acrylic resin dispersion, and a viscosity increasing substance including glycol and/or glycerine, providing a steric stabilization of the pigments and adapting the size of the pigments and the viscosity of the water-based ink such that a settling velocity of the pigments exceeds about 0.001 mm/min at 25° C., circulating said water-based ink within said at least one Piezo print head, and printing a digital image with said at least one Piezo print head by applying ink drops of said water-based ink on the substrate.

First claim

The invention claimed is:

1. A water-based ink for digital printing on a substrate, comprising:
an aqueous pigment mix comprising pigments,
a binder comprising an acrylic resin dispersion, and
a liquid viscosity increasing substance comprising glycol or glycerine,
wherein the pigments are sterically stabilized,
wherein the water-based ink comprises about 3-10 wt % of said pigments and about 5-20 wt % of said acrylic resin dispersion,
wherein a settling velocity of the pigments exceeds 0.001 mm/min at 25° C., and
wherein the viscosity of the water-based ink is about 5-50 cps at 25° C.

2. The water-based ink as claimed in claim 1 , wherein the pigments have an average diameter of about 200-500 nm and a diameter variation of at least 90% of the pigments is within 100 nm 1000 nm.

3. The water-based ink as claimed in claim 1 , wherein at least 90% of the pigments have a diameter exceeding 250 nm.

4. The water-based ink as claimed in claim 1 , wherein at least 90% of the pigments have a diameter smaller than 800 nm.

5. The water-based ink as claimed in claim 1 , wherein the liquid viscosity increasing substance comprises at least 30 wt % of glycol and/or glycerine.

6. The water-based ink as claimed in claim 1 , wherein the liquid viscosity increasing substance comprises ethylene glycol or propylene glycol or polyethylene glycol or diethylene glycol or butane diol or a mixture thereof.

7. The water-based ink as claimed in claim 1 , further comprising a dispersing agent for steric stabilization of the pigments.

8. The water-based ink as claimed in claim 1 , wherein after sedimentation of the ink, the ink resumes its original properties after being stirred.

9. The water-based ink as claimed in claim 1 , wherein the ink comprises at least 30 wt % of de-ionised water.

10. The water-based ink as claimed in claim 1 , wherein the viscosity of the water-based ink exceeds 15 cps at 25° C.

11. The water-based ink as claimed in claim 1 , wherein the settling velocity of the pigments is 0.01-1 mm/min at 25° C.

12. A water-based ink for digital printing on a substrate, comprising:
an aqueous pigment mix comprising pigments with an average diameter of about 200-400 nm and with a pigment diameter variation of at least 90% of the pigments within 100 nm-1000 nm,
a binder comprising an acrylic resin dispersion, and
a liquid viscosity increasing substance comprising glycol or glycerine,
wherein the pigments are sterically stabilized,
wherein the water-based ink comprises about 3-10 wt % of said pigments and about 5-20 wt % of said acrylic resin dispersion, and
wherein the viscosity of the water-based ink is about 5-50 cps at 25° C.

13. The water-based ink as claimed in claim 12 , wherein at least 90% of the pigments have a diameter exceeding 250 nm.

14. The water-based ink as claimed in claim 12 , wherein at least 90% of the pigments have a diameter smaller than 800 nm.

15. The water-based ink as claimed in claim 12 , wherein the liquid viscosity increasing substance comprises at least 30 wt % of glycols and/or glycerine.

16. The water-based ink as claimed in claim 12 , wherein the liquid viscosity increasing substance comprises ethylene glycol or propylene glycol or polyethylene glycol or diethylene glycol or butane diol.

17. The water-based ink as claimed in claim 12 , wherein the ink comprises at least 30 wt % of de-ionised water.

18. The water-based ink as claimed in claim 12 , wherein the viscosity of the water-based ink exceeds 15 cps at 25° C.

19. The water-based ink as claimed in claim 12 , further comprising a dispersing agent for steric stabilization of the pigments.

20. The water-based ink as claimed in claim 12 , wherein after sedimentation of the ink, the ink resumes its original properties after being stirred.

21. The water-based ink as claimed in claim 7 , wherein the ink comprises 3-5 wt % of the dispersing agent for steric stabilization of the pigments so that the settling velocity of the pigments is 0.01 mm/min−1 mm/min at 25° C.

22. A water-based ink for digital printing on a substrate, comprising:
an aqueous pigment mix comprising pigments,
a binder comprising an acrylic resin dispersion, and
a liquid viscosity increasing substance comprising glycol or glycerine,
wherein the pigments are sterically stabilized,
wherein the water-based ink comprises about 3-10 wt % of said pigments and about 5-20 wt % of said acrylic resin dispersion,
wherein the liquid viscosity increasing substance comprises at least 30 wt % of glycols and/or glycerine, and
wherein the viscosity of the water-based ink is about 5-50 cps at 25° C.

Assignees

• Ceraloc Innovation Ab

Inventors

• Pervan Darko

Classifications

• C09D11/322

  Pigment inks · CPC title

• C09D11/037

  characterised by the pigment · CPC title

• B41J2/01

  Ink jet · CPC title

• C09D11/107 Primary

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/326

  characterised by the pigment dispersant · CPC title