Electrostatic ink compositions

Patent metadata

Field	Value
Publication number	US-10416583-B2
Application number	US-201616072461-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Mar 4, 2016
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

The present disclosure is drawn to an electrostatic ink composition comprising a resin having a M w of 10,000 or less and a conductive species. Also disclosed herein is a substrate on which is electrostatically printed a conductive trace, wherein the trace comprises a resin having a M w of 10,000 or less and a conductive species. Further disclosed herein is a method of electrophotographic printing an electrostatic ink composition comprising a resin having a M w of 10,000 or less and a conductive species.

First claim

The invention claimed is:

1. An electrostatic ink composition comprising:
a resin having a M w of 10,000 or less; and
a conductive species in an amount of at least 30 wt. % of the total solids content of the composition.

2. The electrostatic ink composition of claim 1 , wherein the conductive species comprises an elongate conductive species selected from carbon nanotubes, graphene and metals.

3. The electrostatic ink composition of claim 2 , wherein the elongate conductive species comprises or is carbon nanotubes.

4. The electrostatic ink composition of claim 1 , wherein the resin comprises a polymer having acidic side groups.

5. The electrostatic ink composition of claim 1 , wherein the resin comprises a co-polymer of an alkylene monomer and a monomer selected from acrylic acid and methacrylic acid.

6. The electrostatic ink composition of claim 1 , wherein the resin comprises a polymer having acidic side groups and a co-polymer of an alkylene monomer and acrylic acid.

7. The electrostatic ink composition of claim 1 , wherein the resin comprises a polymer having acidic side groups and a co-polymer of an alkylene monomer and a maleic anhydride.

8. The electrostatic ink composition of claim 1 , wherein the resin has a M w of 3,000 or less.

9. The electrostatic ink composition of claim 1 , wherein the resin is present in an amount of at least 20 wt. % of the total solids content of the composition.

10. The electrostatic ink composition of claim 1 , wherein the conductive species is present in an amount of at least 40 wt. % of the total solids content of the composition.

11. The electrostatic ink composition of claim 1 , further comprising a carrier fluid.

12. A substrate on which is electrostatically printed a conductive trace, wherein the trace comprises:
a resin having a M w of 10,000 or less; and
a conductive species in an amount of at least 30 wt. % of the total solids content of the trace.

13. The substrate of claim 12 , wherein the conductive species comprises carbon nanotubes.

14. The substrate of claim 12 , wherein the resin comprises a thermoplastic resin comprising a polymer having acidic side groups.

15. A method of electrophotographically printing an electrostatic ink composition, wherein the electrostatic ink composition comprises a resin having a M w of 10,000 or less and a conductive species in an amount of at least 30 wt. % of the total solids content of the composition, and the method comprises:
forming a latent electrostatic image on a surface;
contacting the surface with the electrostatic ink composition, such that least some of the particles adhere to the surface to form a developed toner image on the surface, and transferring the toner image to a substrate.

Assignees

• Hp Indigo Bv

Inventors

• Katz Gregory
• Grinwald Yaron
• Kokotov Michael
• Guslitzer Regina

Classifications

• G03G9/132

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/13

  characterised by polymer components · CPC title

• G03G9/122 Primary

  characterised by the colouring agents · CPC title

• H01B1/24

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title

• H01B5/14

  comprising conductive layers or films on insulating-supports · CPC title