Magenta inks

Patent metadata

Field	Value
Publication number	US-10047233-B2
Application number	US-201415308788-A
Country	US
Kind code	B2
Filing date	Jun 4, 2014
Priority date	Jun 4, 2014
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The present disclosure is drawn to a magenta pigment blend, a magenta ink, and a method of formulation a magenta pigment blend. The magenta pigment blend can be a first pigment including a solid solution of Pigment Violet 19 and Pigment Red 122, or Pigment Red 282; and a second pigment including Pigment Red 150. The weight ratio of the first pigment to the second pigment can be from 50:50 to 80:20 by pigment solids content.

First claim

What is claimed is:

1. A magenta ink, comprising:
a liquid vehicle including water, organic co-solvent, and surfactant; and
from 2 wt % to 9 wt % of a magenta pigment blend suspended therein, said magenta pigment blend comprising:
quinacridone pigment having the general formula:

wherein R 1 and R 2 are each independently H, a halogen atom, or a C 1 to C 4 alkyl group, and azo pigment having the general formula:

wherein R a is H, aryl, or C 1 to C 4 alkyl, wherein when R a is aryl, the aryl is not a phenyl group having at least one hydrogen that has been substituted with a chlorine atom; wherein R b and R d are independently H, a C 1 to C 4 alkyl, an oxygen-containing functional group, a nitrogen-containing functional group, or a sulphur-containing functional group; wherein R c is H; and wherein the weight ratio of quinacridone pigment to the azo pigment is from 50:50 to 80:20 by pigment solids content.

2. The magenta ink of claim 1 , wherein the quinacridone pigment comprises a solid solution of Pigment Violet 19 and Pigment Red 122, or the quinacridone pigment comprises Pigment Red 282.

3. The magenta ink of claim 1 , wherein the azo pigment comprise Pigment Red 150.

4. The magenta ink of claim 1 , formulated as an inkjet ink.

5. The magenta ink of claim 1 , wherein the surfactant comprises an acetylenic diol non-ionic surfactant, a polysorbate surfactant, or C 12 -C 18 polyoxyethylene glycol ether surfactant, a perfluoropolyether surfactant, or a combination thereof.

6. The magenta ink of claim 1 , wherein the organic co-solvent comprises triethylene glycol, a cyclic amide, or a combination thereof.

7. The magenta ink of claim 6 , wherein the cyclic amide comprises 2-pyrrolidinone, di-(2-hydroxyethyl)-5,5-dimethylhydantoin, or mixture thereof.

8. The magenta ink of claim 1 , wherein the ink is devoid of dye.

9. The magenta ink of claim 1 , further comprising from 0.1 wt % to 3 wt % polymeric binder.

10. The magenta ink of claim 1 , wherein the quinacridone pigment and the azo pigment are both dispersed in a manner such that settling within the magenta ink over a period of 270 days is such that a weight ratio of quinacridone pigment to azo pigment anywhere within the ink is within ±3% compared to initial ratio measurements.

11. The magenta ink of claim 1 , wherein the weight ratio of quinacridone pigment to the azo pigment is from 70:30 by pigment solids content.

12. The magenta ink of claim 1 , wherein the quinacridone pigment consists of PR 282 and the azo pigment consists of PR 150.

13. The magenta ink of claim 1 , wherein the magenta pigment blend is present in the ink composition from 2 wt % to 4.2 wt %.

Assignees

• Hewlett Packard Development Co

Inventors

• Deardurff Larrie
• Bhatt Jayprakash C
• Ruud Cory J
• Chaffins Sterling
• Thornberry Matthew

Classifications

• C09D11/322 Primary

  Pigment inks · CPC title

• C09B67/0033

  Blends of pigments; Mixtured crystals; Solid solutions · CPC title

• C09D11/38

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

• C09D11/102

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

• C09B67/0041

  mixtures containing one azo dye · CPC title