Ink-jet ink comprising a glycol compound with grafts

• US 6,783,581 B2
• Filed: 10/29/2002
• Issued: 08/31/2004
• Est. Priority Date: 10/30/2001
• Status: Expired due to Term

• Current Assignee: Cedar Lane Technologies Inc.
• Original Assignee: BenQ Corporation (Qisda Corporation)
• Inventors: Lin, Yu-Ting, Shen, Yu-Chang, Chien, Chia-Hsin
• Primary Examiner(s): Bell, Mark L.
• Assistant Examiner(s): Faison, Veronica F.
• Application Number:
  US10/281,972
• Publication Number:
  US 20030101906A1
• Time in Patent Office: 672 Days
• Field of Search: 106/31.86, 106/31.65
• US Class Current: 106/31.86
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes

Abstract

An ink-jet ink comprising a glycol compound with grafts, an aqueous solution, a pigment as a colorant, a surfactant, and a humectant is disclosed. The ink-jet ink has low surface tension and high drying speed. Moreover, the ink-jet ink has high adhesive force between the ink drops and the printing medium, and thus provides the printing medium with high water fastness.

Claims

1. An ink-jet ink composition, comprising:

at least one colorant, wherein the colorant is a dispersing pigment;

a medium comprising an aqueous solution; and

at least one water-soluble glycol compound with grafts selected from the group consisting of 2,4-diethyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,2-dimethylpropane-1,3-diol and 2,5-dimethylhexane-2,5-diol.

2. The ink-jet ink composition as claimed in claim 1, wherein the glycol compound with grafts is present in a concentration from about 0.01 wt % to about 25 wt %.

3. The ink-jet ink composition as claimed in claim 1, wherein an average particle size of the dispersing pigment is less than 1 μ

m.

4. The ink-jet ink composition as claimed in claim 1, wherein the medium comprises a surfactant.

5. The ink-jet ink composition as claimed in claim 1, wherein the medium comprises an organic solvent.

6. The ink-jet ink composition as claimed in claim 1, wherein the medium comprises a humectant.

7. The ink-jet ink composition as claimed in claim 1, wherein the medium comprises a pH buffer.

8. The ink-jet ink composition as claimed in claim 1, wherein the medium comprises a biocide.

9. A method of ink-jet printing, comprising the steps of:

providing an ink-jet ink composition, comprising;

at least one colorant, wherein the colorant is a dispersing pigment;

a medium comprising an aqueous solution;

at least one water-soluble glycol compound with grafts selected from the group consisting of 2,4-diethyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2.2-dimethylpropane-1,3-diol and 2,5-dimethylhexane-2,5-diol; and

printing the ink-jet ink composition on a printing media by means of an ink-jet pen.

10. The method of claim 9, wherein the glycol compound with grafts is present in a concentration from about 0.01 wt % to about 25 wt %.

11. The method of claim 9, wherein an average particle size of the dispersing pigment is less than 1 μ

m.

12. The method of claim 9, wherein the medium comprises a surfactant.

13. The method of claim 9, wherein the medium comprises an organic solvent.

14. The method of claim 9, wherein the medium comprises a humectant.

15. The method of claim 9, wherein the medium comprises a pH buffer.

16. The method of claim 9, wherein the medium comprises a biocide.