Methods for printing on a substrate and related aspects

Patent metadata

Field	Value
Publication number	US-12038701-B2
Application number	US-202017635063-A
Country	US
Kind code	B2
Filing date	Jan 17, 2020
Priority date	Jan 17, 2020
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

Here is provided a method of printing on a substrate, the method comprising: providing a substrate, wherein the substrate has been primed by a primer composition comprising water, an epoxide crosslinker, polyethyleneimine and a glycol co-solvent, the primer composition having formed a primer layer on the substrate, and printing an electrostatic ink on the primer layer. A fluid set comprising the primer composition and an electrostatic ink is also described herein.

First claim

The invention claimed is:

1. A method of printing on a substrate, the method comprising:
providing a substrate, wherein the substrate has been primed by a primer composition comprising water, an epoxide crosslinker, polyethyleneimine and a glycol co-solvent, the primer composition having formed a primer layer on the substrate; and
printing an electrostatic ink on the primer layer.

2. The method according to claim 1 , wherein the substrate comprises a film of a material selected from biaxially orientated polyethylene, biaxially oriented polypropylene (BOPP), polyethylene terephthalate (PET), and oriented polyamide (OPA).

3. The method according to claim 1 , wherein the primer layer has a dry coat weight of from 0.05 g/m 2 to 0.175 g/m 2 .

4. The method according to claim 1 , wherein the electrostatic ink comprises a thermoplastic resin, and wherein the thermoplastic resin comprises a polymer having acidic side groups.

5. The method according to claim 1 , wherein the epoxide crosslinker crosslinks the polyethyleneimine and/or the electrostatic ink.

6. The method according to claim 1 , wherein the epoxide crosslinker comprises an internal epoxide.

7. The method according to claim 1 , wherein the epoxide crosslinker comprises at least two epoxycyclohexyl groups.

8. The method according to claim 1 , wherein the polyethyleneimine is a branched polyethyleneimine.

9. The method according to claim 1 , wherein the glycol co-solvent is propylene glycol.

10. The method according to claim 1 , wherein the primer composition includes at least 35 wt. % of the glycol-solvent.

11. The method according to claim 1 , wherein the primer composition comprises the polyethyleneimine and the epoxide crosslinker in a ratio of from 2:1 to 1:2 by weight.

12. The method according to claim 1 , wherein the primer composition comprises:
from 1 wt. % to 8 wt. % of the polyethyleneimine;
from 0.3 wt. % to 6 wt. % of the epoxide crosslinker;
at least 40 wt. % of the glycol co-solvent; and
a balance of the water.

13. The method according to claim 1 , wherein the method includes forming the primer layer on the substrate by applying the primer composition to the substrate, and wherein the electrostatic ink is a liquid electrostatic ink.

14. A printing apparatus for printing on a substrate, the printing apparatus comprising:
a receptacle containing a primer composition comprising water, an epoxide crosslinker, polyethyleneimine and a glycol co-solvent;
a device to apply the primer composition to the substrate to form a primer layer on the substrate; and
an electrostatic printing apparatus to print an electrostatic ink on the primer layer on the substrate.

15. A fluid set, comprising:
a primer composition comprising water, an epoxide crosslinker, polyethyleneimine, and a glycol co-solvent; and
an electrostatic ink.

Assignees

• Hewlett Packard Development Co

Inventors

• Zigdon Chen
• Braun Liora
• Shitrit Mirit
• Tzomik Inna
• Guslitzer Regina

Classifications

• C09D11/02

  Printing inks (C09D11/30 takes precedence) · CPC title

• C09D5/002

  Priming paints (C09D5/08 takes precedence) · CPC title

• G03G7/0073

  Organic components thereof · CPC title

• G03G9/13

  characterised by polymer components · CPC title

• G03G7/008

  being macromolecular · CPC title