Polyurethane dispersion-containing inkjet inks

• US 8,722,762 B2
• Filed: 06/28/2012
• Issued: 05/13/2014
• Est. Priority Date: 06/28/2012
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Peleshanko, Sergiy
• Primary Examiner(s): Chung, Susannah
• Assistant Examiner(s): Butcher, Robert T
• Application Number:
  US13/536,674
• Publication Number:
  US 20140005330A1
• Time in Patent Office: 684 Days
• Field of Search: None
• US Class Current: 523/160
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/3206 aliphatic
• CPC Class Codes: C08G 18/3212 containing cycloaliphatic groups
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/348 Hydroxycarboxylic acids
• CPC Class Codes: C08G 18/44 Polycarbonates
• CPC Class Codes: C08G 18/6659 with compounds of group C08G18/34
• CPC Class Codes: C08G 18/722 Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• CPC Class Codes: C08G 18/758 containing two or more cycloaliphatic rings
• CPC Class Codes: C09D 11/102 containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: C09D 11/40 Ink-sets specially adapted for multi-colour inkjet printing

Abstract

The present disclosure provides inks, ink sets, and method for manufacturing inkjet inks. The inkjet ink can comprise a colorant, a liquid vehicle, and a polyurethane dispersion comprising polyurethane particles dispersed in the liquid vehicle. The polyurethane particles can have a core-shell structure with a branched inner core structure, and wherein the core comprises an amine cross-linker in an amount of 0.1 wt % to 1 wt % and the shell comprises a polyol cross-linker in an amount of 0.5 wt % to 2 wt %.

Claims

1. A polyurethane dispersion-containing inkjet ink, comprising:

a colorant;

a liquid vehicle; and

a polyurethane dispersion comprising polyurethane particles dispersed in the liquid vehicle,

wherein the polyurethane particles have a core-shell structure with a branched inner core structure, and wherein the core comprises an amine cross-linker in an amount of 0.1 wt % to 1 wt % based on the weight of the polyurethane particle and the shell comprises a polyol cross-linker in an amount of 0.5 wt % to 2 wt % based on the weight of the polyurethane particle.

2. The inkjet ink of claim 1, wherein the branched inner core structure is provided by a branched diisocyanate.

3. The inkjet ink of claim 2, wherein the branched diisocyanate comprises a cyclic group.

4. The inkjet ink of claim 1, wherein the polyurethane particles further comprise polymerized monomers including a polyol, a branched diisocyanate, and an acid polyol.

5. The inkjet ink of claim 4, wherein the polyol is present as part of a first segment and comprises a diol selected from the group consisting of:

cyclic diols;

1,3-cyclohexanedimethanol;

1,4-cyclohexanedimethanol;

aliphatic polycarbonate diols;

polyether diols;

polyethylene glycol;

polypropylene glycol;

polytetramethylene glycol;

poly(ethylene oxide) polymers;

polypropylene oxide) polymers;

poly(tetramethylene oxide) polymers;

copolymers thereof having terminal hydroxyl groups derived from polyhydric compounds including diols;

combinations thereof, and mixtures thereof.

6. The inkjet ink of claim 4, wherein the polyol is present as part of a second segment and comprises a member selected from the group consisting of:

cyclic diols;

1,3-cyclohexanedimethanol;

1,4-cyclohexanedimethanol;

aliphatic polycarbonate diols;

polyether diols;

polyethylene glycol;

polypropylene glycol;

polytetramethylene glycol;

poly(ethylene oxide) polymers;

polypropylene oxide) polymers;

poly(tetramethylene oxide) polymers;

copolymers thereof having terminal hydroxyl groups derived from polyhydric compounds including diols and triols; and

combinations thereof.

7. The inkjet ink of claim 4, wherein the polyol comprises a cyclic diol as part of a first segment and an aliphatic polycarbonate diol as part of a second segment.

8. The inkjet ink of claim 4, wherein the diisocyanate is selected from the group consisting of cycloaliphatic diisocyanates, bis(4-isocyanotocyclohexyl) methane, methylene diphenyl diisocyanate, hexamethylene diisocyanate, p-tetramethyl xylene diisocyanate, m-tetramethyl xylene diisocyanate, bitolylene diisocyanate, toluene diisocyanate, methylene-bis(4-cyclohexyl)diisocyanate, p-phenylene diisocyanate, isophorone diisocyanate, 1,5-naphthalene diisocyanate, and combinations thereof.

9. The inkjet ink of claim 4, wherein the diisocyanate is a cycloaliphatic diisocyanate.

10. The inkjet ink of claim 4, wherein the acid polyol has the structure HO—

(CH₂)_n(CR₁R₂)_m(CH₂)_p—

OH where R₁ and R₂ are independently H, hydroxyl, an alkyl group, or an acid group;

n ranges from 0 to 20;

p ranges from 0 to 20; and

m ranges from 1 to 20;

wherein at least one of R₁ and R₂ is an acid group.

11. The inkjet ink of claim 4, wherein the acid polyol has from 4 to 12 carbons.

12. The inkjet ink of claim 1, wherein the amine cross-linker is an aliphatic polyamine and the polyol cross-linker is an aliphatic polyol.

13. The inkjet ink of claim 1, wherein the colorant is present in an amount of 0.1 wt % to 5 wt % of the inkjet ink and the polyurethane dispersion is present in an amount of 1 wt % to 15 wt % of the inkjet ink.

14. An ink set comprising the inkjet ink of claim 1.