Liquid electrophotographic composition

Patent metadata

Field	Value
Publication number	US-10197935-B2
Application number	US-201515536076-A
Country	US
Kind code	B2
Filing date	Jan 19, 2015
Priority date	Jan 19, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A liquid electrophotographic composition is described, which comprises a carrier liquid, a polymer resin comprising a copolymer of an alkylene monomer and a monomer selected from acrylic acid and methacrylic acid, and at least 5 wt. % of an optical brightening agent based on the total solids content of the composition.

First claim

The invention claimed is:

1. A liquid electrophotographic composition, comprising:
a carrier liquid;
a polymer resin comprising a copolymer of an alkylene monomer and a monomer selected from acrylic acid and methacrylic acid; and
an optical brightening agent present in amount from 0.1 wt % to less than 20 wt %, based on the total solids content of the composition;
wherein the liquid electrophotographic composition is a colorless liquid electrophotographic composition.

2. The liquid electrophotographic composition of claim 1 , wherein the liquid electrophotographic composition is a transparent or non-pigmented liquid electrophotographic composition.

3. The liquid electrophotographic composition of claim 1 , wherein the optical brightening agent is a colorless colourless optical brightening agent.

4. The liquid electrophotographic composition of claim 3 , wherein the optical brightening agent is a fluorophore.

5. The liquid electrophotographic composition of claim 1 , wherein the optical brightening agent comprises one or more of a triazine stilbene and derivatives thereof, a biphenyl stilbene and derivatives thereof, a coumarin and derivatives thereof, a benzoxazoline and derivatives thereof, a diazole and derivatives thereof, an imidazoline and derivatives thereof, or mixtures thereof.

6. The liquid electrophotographic composition of claim 1 , wherein the composition further comprises a fluorescence adjuvant.

7. The liquid electrophotographic composition of claim 1 , wherein the composition further comprises a charge director.

8. The liquid electrophotographic composition of claim 1 , wherein the polymer resin comprises a copolymer of ethylene and acrylic acid.

9. The liquid electrophotographic composition of claim 1 , wherein the polymer resin comprises a copolymer of ethylene and methacrylic acid.

10. The liquid electrophotographic composition of claim 1 , wherein the optical brightening agent is insoluble in the carrier liquid.

11. The liquid electrophotographic composition of claim 6 , wherein the fluorescence adjuvant is maltose monohydrate.

12. A method of making the liquid electrophotographic composition of claim 1 , comprising grinding:
the carrier liquid;
the polymer resin comprising the copolymer of the alkylene monomer and the monomer selected from acrylic acid and methacrylic acid; and
the optical brightening agent, to form the liquid electrophotographic composition.

13. A method of using the liquid electrophotographic composition of claim 1 , comprising:
printing the liquid electrophotographic composition to form a printed transparent electrophotographic composition; and
determining a coat weight of the printed transparent electrophotographic composition.

14. The method of claim 13 wherein the determining of the coat weight of the printed transparent electrophotographic composition includes determining a fluorescence of the printed transparent electrophotographic composition.

Assignees

• Hp Indigo Bv
• Hp Indigo Bv

Inventors

• Tzomik Inna
• Ron Hannoch
• Skvirsky Daniel
• Glick Einat

Classifications

• G03G9/131

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

• G03G9/0926 Primary

  characterised by physical or chemical properties · CPC title

• C09D11/32

  characterised by colouring agents · CPC title

• G03G9/122

  characterised by the colouring agents · CPC title

• G03G15/10

  using a liquid developer · CPC title