Liquid developer and developer cartridge

Patent metadata

Field	Value
Publication number	US-9766565-B2
Application number	US-201615235896-A
Country	US
Kind code	B2
Filing date	Aug 12, 2016
Priority date	Feb 12, 2016
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A liquid developer includes a carrier liquid and a toner including a urethane-modified acrylic resin.

First claim

What is claimed is:

1. A liquid developer comprising:
a carrier liquid; and
a toner including a urethane-modified acrylic resin.

2. The liquid developer according to claim 1 ,
wherein the urethane-modified acrylic resin is a graft polymer of an acrylic resin and a urethane resin.

3. The liquid developer according to claim 1 ,
wherein the urethane-modified acrylic resin is a graft polymer of an acryl resin and a polyester urethane resin.

4. The liquid developer according to claim 2 ,
wherein, in the graft polymer, a urethane chain is bonded to a side chain of the acrylic resin.

5. The liquid developer according to claim 1 ,
wherein the urethane-modified acrylic resin includes an acrylic portion constituted by a monomer having a reactive group.

6. The liquid developer according to claim 5 ,
wherein the acrylic portion has a glass-transition temperature Tg of 20° C. to 85° C.

7. The liquid developer according to claim 1 ,
wherein the urethane-modified acrylic resin includes a linear urethane portion.

8. The liquid developer according to claim 1 ,
wherein the urethane-modified acrylic resin has a weight-average molecular weight of 5,000 to 200,000.

9. The liquid developer according to claim 1 ,
wherein the urethane-modified acrylic resin includes a urethane portion and an acrylic portion at a weight ratio of 10/90 to 90/10.

10. The liquid developer according to claim 1 ,
wherein the toner includes another binder resin in an amount of 10% to 95% by weight of the total amount of the toner.

11. The liquid developer according to claim 10 ,
wherein the total amount of the urethane-modified acrylic resin and the other binder resin is 70% to 99% by weight of the total amount of the toner.

12. The liquid developer according to claim 1 ,
wherein the toner includes a colorant in an amount of 0.5% to 25% by weight of the total amount of the toner.

13. The liquid developer according to claim 1 ,
wherein the toner includes a parting agent in an amount of 0.1% to 10% by weight of the total amount of the toner.

14. The liquid developer according to claim 1 ,
wherein the toner includes inorganic particles in an amount of 0.1% to 10% by weight of the total amount of the toner.

15. The liquid developer according to claim 1 ,
wherein the carrier liquid includes a mineral oil.

16. The liquid developer according to claim 15 ,
wherein the carrier liquid has a volume resistivity of 1.0×10 10 Ω·cm or more and 1.0×10 14 Ω·cm or less.

17. The liquid developer according to claim 1 ,
wherein the amount of the toner including the urethane-modified acrylic resin is 0.5 to 40 parts by weight relative to 100 parts by weight of the carrier liquid.

18. A developer cartridge comprising the liquid developer according to claim 1 .

Assignees

• Fuji Xerox Co Ltd

Inventors

• Oki Masahiro
• Horiba Koji
• Kobayashi Takako
• Imai Akira
• Ogura Yoshitake
• Moriya Hiroyuki
• Yoshino Daisuke

Classifications

• G03G15/10

  using a liquid developer · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/125

  characterised by the liquid · CPC title

• G03G9/133 Primary

  Graft-or block polymers · CPC title

• G03G9/08795

  characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants · CPC title