Aqueous pigment dispersions

Patent metadata

Field	Value
Publication number	US-11760892-B2
Application number	US-201816765599-A
Country	US
Kind code	B2
Filing date	Jan 19, 2018
Priority date	Jan 19, 2018
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present disclosure is drawn to aqueous pigment dispersions. In one example, an aqueous pigment dispersion can include from 40 wt % to 90 wt % water, from 2 wt % to 30 wt % organic co-solvent, from 7.5 wt % to 30 wt % copper phthalocyanine pigment, from 0.5 wt % to 5 wt % styrene-acrylic dispersant, and from 0.5 wt % to 5 wt % hydrophilic polyurethane dispersant having a weight average molecular weight from 10,000 Mw to 30,000 Mw. The styrene-acrylic dispersant and the hydrophilic polyurethane dispersant can be present at a weight ratio from 1:10 to 2:1.

First claim

What is claimed is:

1. A latex ink composition, comprising:
an aqueous liquid vehicle;
from 0.3 wt % to 7 wt % of a copper phthalocyanine pigment, wherein the copper phthalocyanine pigment is co-dispersed by a styrene-acrylic dispersant and a hydrophilic polyurethane dispersant having a weight average molecular weight from 10,000 Mw to 30,000 Mw, the hydrophilic polyurethane dispersant being a copolymerization product of monomers including an aromatic diol, an acid-containing diol, and a non-aromatic diisocyanate, wherein the aromatic diol is

or a combination thereof, wherein m and n are independently integers from 1 to 10; and
from 1 wt % to 15 wt % of latex particles.

2. The latex ink composition of claim 1 , wherein the styrene-acrylic dispersant and the hydrophilic polyurethane dispersant are present at a weight ratio from 1:10 to 2:1.

3. The latex ink composition of claim 1 , wherein the monomers of the hydrophilic polyurethane dispersant are copolymerized in amounts of from 10 wt % to 50 wt % of the aromatic diol, from 10 wt % to 40 wt % of the acid-containing diol, and from 25 wt % to 75 wt % of the non-aromatic diisocyanate.

4. The latex ink composition of claim 1 , wherein the copper phthalocyanine pigment and total dispersant content are present at a weight ratio from 15:1 to 2:1.

5. The latex ink composition of claim 1 , wherein the styrene-acrylic dispersant has a weight average molecular weight ranging from 4,000 Mw to 30,000 Mw and an acid number ranging from 100 mg/g to 350 mg/g, and wherein the hydrophilic polyurethane dispersant has an acid number ranging from 40 mg/g to mg/g 100.

6. The latex ink composition of claim 1 , wherein the hydrophilic polyurethane dispersant has an average particle size ranging from 0.1 nm to 30 nm.

7. The latex ink composition of claim 1 , wherein the latex particles comprise a polymerization product of:
a copolymerizable surfactant;
an aromatic monomer selected from styrene, an aromatic (meth)acrylate monomer, and an aromatic (meth)acrylamide monomer; and
multiple aliphatic (meth)acrylate monomers or multiple aliphatic (meth)acrylamide monomers.

8. A latex ink composition, comprising:
an aqueous liquid vehicle;
from 0.3 wt % to 7 wt % of a copper phthalocyanine pigment, wherein the copper phthalocyanine pigment is co-dispersed by a styrene-acrylic dispersant and a hydrophilic polyurethane dispersant having a weight average molecular weight from 10,000 Mw to 30,000 Mw, the hydrophilic polyurethane dispersant being a copolymerization product of monomers including an aromatic diol, an acid-containing diol, and a non-aromatic diisocyanate, wherein the non-aromatic diisocyanate is

or a combination thereof; and
from 1 wt % to 15 wt % of latex particles.

9. The latex ink composition of claim 8 , wherein the styrene-acrylic dispersant and the hydrophilic polyurethane dispersant are present at a weight ratio from 1:10 to 2:1.

10. The latex ink composition of claim 8 , wherein the monomers of the hydrophilic polyurethane dispersant are copolymerized in amounts of from 10 wt % to 50 wt % of the aromatic diol, from 10 wt % to 40 wt % of the acid-containing diol, and from 25 wt % to 75 wt % of the non-aromatic diisocyanate.

11. The latex ink composition of claim 8 , wherein the copper phthalocyanine pigment and total dispersant content are present at a weight ratio from 15:1 to 2:1.

12. The latex ink composition of claim 8 , wherein the styrene-acrylic dispersant has a weight average molecular weight ranging from 4,000 Mw to 30,000 Mw and an acid number ranging from 100 mg/g to 350 mg/g, and wherein the hydrophilic polyurethane dispersant has an acid number ranging from 40 mg/g to mg/g 100.

13. The latex ink composition of claim 8 , wherein the hydrophilic polyurethane dispersant has an average particle size ranging from 0.1 nm to 30 nm.

14. The latex ink composition of claim 8 , wherein the latex particles comprise a polymerization product of:
a copolymerizable surfactant;
an aromatic monomer selected from styrene, an aromatic (meth)acrylate monomer, and an aromatic (meth)acrylamide monomer; and
multiple aliphatic (meth)acrylate monomers or multiple aliphatic (meth)acrylamide monomers.

15. A method of formulating a latex ink composition, comprising admixing an aqueous latex dispersion and an aqueous pigment dispersion including a copper phthalocyanine pigment co-dispersed by a styrene-acrylic dispersant and a hydrophilic polyurethane dispersant having a weight average molecular weight from 10,000 Mw to 30,000 Mw in an aqueous liquid vehicle, the hydrophilic polyurethane dispersant being a copolymerization product of monomers including an aromatic diol, an acid-containing diol, and a non-aromatic diisocyanate, and wherein the aromatic diol is

or a combination thereof, wherein m and n are independently integers from 1 to 10, and
wherein the latex ink composition includes from 0.3 wt % to 7 wt % of the copper phthalocyanine pigment and from 1 wt % to 15 wt % of latex particles.

16. The method of claim 15 , wherein the monomers of the hydrophilic polyurethane dispersant are copolymerized in amounts of from 10 wt % to 50 wt % of the aromatic diol, from 10 wt % to 40 wt % of the acid-containing diol, and from 25 wt % to 75 wt % of the non-aromatic diisocyanate.

17. A method of formulating a latex ink composition, comprising admixing an aqueous latex dispersion and an aqueous pigment dispersion including a copper phthalocyanine pigment co-dispersed by a styrene-acrylic dispersant and a hydrophilic polyurethane dispersant having a weight average molecular weight from 10,000 Mw to 30,000 Mw in an aqueous liquid vehicle, the hydrophilic polyurethane dispersant being a copolymerization product of monomers including an aromatic diol, an acid-containing diol, and a non-aromatic diisocyanate, and wherein the non-aromatic diisocyanate is

or a combination thereof, and
wherein the latex ink composition includes from 0.3 wt % to 7 wt % of the copper phthalocyanine pigment and from 1 wt % to 15 wt % of latex particles.

18. The method of claim 17 , wherein the monomers of the hydrophilic polyurethane dispersant are copolymerized in amounts of from 10 wt % to 50 wt % of the aromatic diol, from 10 wt % to 40 wt % of the acid-containing diol, and from 25 wt % to 75 wt % of the non-aromatic diisocyanate.

Assignees

• Hewlett Packard Development Co

Inventors

• Guo Dennis Z
• Zheng Jie
• Chen Tienteh
• Ingle David Michael
• Stramel Rodney David
• Yang June
• Caban Marcos A Barreto

Classifications

• C09D11/322 Primary

  Pigment inks · CPC title

• C09D11/326

  characterised by the pigment dispersant · CPC title

• C09D11/102

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

• C09D11/106

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

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title