Liquid ink containing polytetrafluoroethylene wax emulsion

Patent metadata

Field	Value
Publication number	US-11732146-B2
Application number	US-201616311086-A
Country	US
Kind code	B2
Filing date	Oct 10, 2016
Priority date	Oct 10, 2016
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

An example of a liquid ink includes a pigment dispersion, a polyurethane dispersion, a polytetrafluoroethylene wax emulsion, a co-solvent, and a balance of water. A particle diameter of a polytetrafluoroethylene wax in the polytetrafluoroethylene wax emulsion is less than 50 nm. Examples of the liquid ink may be incorporated into a thermal inkjet printing system.

First claim

What is claimed is:

1. A liquid ink, comprising:
a pigment dispersion;
a polyurethane dispersion;
a polytetrafluoroethylene wax emulsion, wherein a particle diameter of a polytetrafluoroethylene wax in the polytetrafluoroethylene wax emulsion is from about 10 nm to less than 50 nm;
a co-solvent; and
a balance of water.

2. The liquid ink as defined in claim 1 wherein the polytetrafluoroethylene wax emulsion is present in the liquid ink in an amount ranging from about 0.25% actives to about 1% actives.

3. The liquid ink as defined in claim 1 wherein:
the pigment dispersion is present in the liquid ink in an amount ranging from about 2% actives to about 5% actives;
the polyurethane dispersion is present in the liquid ink in an amount ranging from about 1% actives to about 15% actives; and
the co-solvent is present in the liquid ink in an amount ranging from about 2 wt % to about 20 wt %.

4. The liquid ink as defined in claim 1 , further comprising a surfactant in an amount ranging from about 0.25 wt % to about 4 wt %.

5. The liquid ink as defined in claim 4 wherein the surfactant includes:
a phosphate surfactant present in an amount ranging from about 0.25 wt % to about 2 wt %; and
an acetylenic surfactant present an amount ranging from about 0.25 wt % to about 2 wt %.

6. The liquid ink as defined in claim 1 , further comprising an additive selected from the group consisting of an antimicrobial agent, an anti-kogation agent, or a combination thereof.

7. The liquid ink as defined in claim 1 wherein the polyurethane dispersion is selected from the group consisting of an aromatic polyether polyurethane dispersion, an aliphatic polyether polyurethane dispersion, an aromatic polyester polyurethane dispersion, an aliphatic polyester polyurethane dispersion, an aromatic polycaprolactam polyurethane dispersion, an aliphatic polycaprolactam polyurethane dispersion, a vinyl-urethane hybrid polymer dispersion, an acrylic-urethane hybrid polymer dispersion, a dispersion of co-polymers thereof, and a combination thereof.

8. The liquid ink as defined in claim 1 wherein the co-solvent is a glycol ether, a humectant, or a combination thereof.

9. The liquid ink as defined in claim 1 wherein the liquid ink is free of any additional components.

10. The liquid ink as defined in claim 1 wherein the co-solvent is a glycol ether present in an amount ranging from about 2 wt % to about 12 wt %, based on a total wt % of the liquid ink.

11. The liquid ink as defined in claim 10 wherein the glycol ether is selected from the group consisting of ethylene glycol monobutyl ether, tripropyleneglycol methyl ether, dipropylene glycol butyl ether, and propylene glycol phenyl ether.

12. The liquid ink as defined in claim 1 wherein the co-solvent is a humectant present in an amount ranging from about 2 wt % to about 12 wt %, based on a total wt % of the liquid ink.

13. The liquid ink as defined in claim 1 wherein the liquid ink is free of any additional waxes.

14. The liquid ink as defined in claim 1 , wherein the polyurethane dispersion is selected from the group consisting of an aromatic polycaprolactam polyurethane dispersion, an aliphatic polycaprolactam polyurethane dispersion, a vinyl-urethane hybrid polymer dispersion, an acrylic-urethane hybrid polymer dispersion, a dispersion of co-polymers thereof, and a combination thereof.

15. A thermal inkjet printing system, comprising:
a liquid ink, including:
a pigment dispersion;
a polyurethane dispersion;
a polytetrafluoroethylene wax emulsion, wherein a particle diameter of a polytetrafluoroethylene wax in the polytetrafluoroethylene wax emulsion is from about 10 nm to less than 50 nm;
a co-solvent; and
a balance of water; and

a thermal inkjet printhead, including at least one thermal inkjet print nozzle.

16. The thermal inkjet printing system as defined in claim 15 wherein the polytetrafluoroethylene wax emulsion is present in the liquid ink in an amount ranging from about 0.25% actives to about 1% actives.

17. The thermal inkjet printing system as defined in claim 15 wherein the thermal inkjet printhead is filled with the liquid ink.

Assignees

• Hewlett Packard Development Co

Inventors

• Yen Max
• Trubnikov Alex
• Rubin Shimrit
• Pinkesfeld Or
• Samoshin Marisa
• Tsao Yi-Hua
• Cohen Eytan

Classifications

• C09D11/023 Primary

  Emulsion inks · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title

• C08K5/521

  Esters of phosphoric acids, e.g. of H3PO4 · CPC title

• C08L27/18

  Homopolymers or copolymers or tetrafluoroethene · CPC title