Single batch latex ink compositions and methods

• US 8,772,369 B2
• Filed: 12/04/2009
• Issued: 07/08/2014
• Est. Priority Date: 12/04/2009
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Chun, Doris Pik-Yiu, Ng, Hou T.
• Primary Examiner(s): SASTRI, SATYA B
• Application Number:
  US13/384,871
• Publication Number:
  US 20120232215A1
• Time in Patent Office: 1,677 Days
• Field of Search: 523/160, 523/161, 523/200, 523/205, 523/220, 523/221, 524/556, 524/560
• US Class Current: 523/161
• CPC Class Codes: C09B 67/0013 with polymeric coatings
• CPC Class Codes: C09B 67/0084 Dispersions of dyes
• CPC Class Codes: C09D 11/326 characterised by the pigment dispersant

Abstract

The present disclosure provides methods and composition directed towards a single batch latex ink-jet ink. In one embodiment, a method of manufacturing a single batch latex ink-jet ink can comprise emulsifying a pigment and a monomer in a solvent, and polymerizing the monomer with a reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particulates thereby forming a single batch latex ink-jet ink. The ink can contain less than about 0.5 wt % of latex particulates having a diameter of 50 nm or less, can contain about 1 wt % to about 10 wt % of latex particulates having a diameter of about 100 nm to about 250 nm and can contain about 3 wt % to about 5 wt % of encapsulated pigment.

Claims

1. A method of manufacturing a single batch latex ink-jet ink, comprising:

emulsifying a pigment and a monomer in a solvent to form an emulsion; and

polymerizing the monomer with a reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particulates, wherein the reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particles is decreasing an initiator loading for polymerization by adding a first amount of the initiator to initiate the polymerization and adding a second amount of initiator during polymerization such that the second amount is added over a period of at least 1 hour and wherein the second amount constitutes at least 30% of total initiator added;

thereby forming a single batch latex ink-jet ink that includes less than about 0.5 wt % of latex particulates having a diameter of 50 nm or less, includes about 1 wt % to about 10 wt % of latex particulates having a diameter of about 100 nm to about 250 nm, and includes about 3 wt % to about 5 wt % of encapsulated pigment, wherein the weight percents are based on a total weight of the ink.

2. The method of claim 1, wherein the single batch latex ink-jet ink contains less than about 0.1 wt % of the latex particulates having a diameter of 50 nm or less and contains about 3 wt % to about 6 wt % of the latex particulates having a diameter of about 100 nm to about 250 nm.

3. The method of claim 1, wherein a ratio of polymerized monomer to pigment is at least 3:

1 by weight.

4. The method of claim 1, wherein the latex particulates have less than about 5 wt % of latex particulates having a diameter of greater than about 500 nm.

5. The method of claim 1, further comprising filtering the single batch latex ink-jet ink through a 10 μ

m screen mesh before use.

6. The method of claim 1, further comprising forming the emulsion by microfluidization having a liquid shear pressure of 1,000 to 30,000.

7. The method of claim 1, further comprising dispersing the pigment and monomer by adding a dispersant.

8. The method of claim 1, wherein the emulsion includes water and a surfactant.

9. The method of claim 1, wherein the monomer includes a linear aliphatic acrylate, a branched aliphatic acrylate, or a cyclic aliphatic acrylate.

10. The method of claim 1, wherein the encapsulated pigment and the latex particulates include at least one hydrophilic monomer and one hydrophobic monomer.

11. The method of claim 1, wherein the polymerizing step includes adding a cross-linker.

12. The method of claim 1, wherein the single batch latex ink-jet ink includes an organic co-solvent.

13. The method of claim 1, wherein a size of the encapsulated pigment to a size of the latex particulate is 2:

1 to 1;

2.