Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge

Patent metadata

Field	Value
Publication number	US-9477166-B2
Application number	US-201514613785-A
Country	US
Kind code	B2
Filing date	Feb 4, 2015
Priority date	Sep 19, 2014
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

An electrostatic charge image developing toner, includes toner particles containing a binder resin including a polyester resin, a release agent including a hydrocarbon wax, and a styrene (meth)acrylic resin, wherein 70% or more of the release agent is present within 800 nm from a surface of the toner particles, the styrene (meth)acrylic resin in the toner particles forms a domain having an average diameter from 0.3 μm to 0.8 μm, and a number ratio of the domain being in a range of ±0.1 μm of the average diameter is 65% or more.

First claim

What is claimed is:

1. An electrostatic charge image developing toner, comprising:
toner particles containing:
a binder resin including a polyester resin;
a release agent including a hydrocarbon wax comprising a Fischer-Tropsch wax; and
a styrene (meth)acrylic resin,

wherein the toner particles have a core-shell structure comprised of a core particle and a shell layer that covers the core, wherein the shell layer comprises the binder resin and the release agent, and
wherein 70% or more of the release agent is present within 800 nm from a surface of the toner particles, the styrene (meth)acrylic resin in the toner particles forms a domain having an average diameter from 0.3 μm to 0.8 μm, and a number ratio of the domain being in a range of ±0.1 μm of the average diameter is 65% or more.

2. The electrostatic charge image developing toner according to claim 1 ,
wherein a ratio of the polyester resin with respect to the binder resin is 85% by weight or more.

3. The electrostatic charge image developing toner according to claim 1 ,
wherein a glass transition temperature (Tg) of the polyester resin is from 50° C. to 80° C.

4. The electrostatic charge image developing toner according to claim 1 ,
wherein a weight average molecular weight (Mw) of the polyester resin is from 5,000 to 1,000,000.

5. The electrostatic charge image developing toner according to claim 1 ,
wherein a molecular weight distribution Mw/Mn of the polyester resin is from 1.5 to 100.

6. The electrostatic charge image developing toner according to claim 1 ,
wherein a content of the binder resin is from 40% by weight to 95% by weight, with respect to the entire toner particles.

7. The electrostatic charge image developing toner according to claim 1 ,
wherein a copolymerization ratio (on a weight basis, styrene monomer/(meth)acrylic monomer) between a styrene monomer and a (meth)acrylic monomer of the styrene (meth)acrylic resin is from 85/15 to 70/30.

8. The electrostatic charge image developing toner according to claim 1 ,
wherein the styrene (meth)acrylic resin has a crosslinking structure.

9. The electrostatic charge image developing toner according to claim 8 ,
wherein a copolymerization ratio (on a weight basis, crosslinkable monomer/entire monomer) of a crosslinkable monomer with respect to the entire monomer which constitutes the styrene (meth)acrylic resin is 2/1000 to 30/1000.

10. The electrostatic charge image developing toner according to claim 1 ,
wherein a melting temperature of the release agent is from 85° C. to 110° C.

11. The electrostatic charge image developing toner according to claim 1 ,
wherein a content of the release agent is from 1% by weight to 20% by weight, with respect to the entire toner particles.

12. The electrostatic charge image developing toner according to claim 1 ,
wherein a shape factor SF1 of the toner particles is from 110 to 150.

13. The electrostatic charge image developing toner according to claim 1 ,
wherein the toner particles contain 0.01% by weight to 5% by weight of an inorganic particle with respect to the toner particles.

14. The electrostatic charge image developing toner according to claim 13 ,
wherein a surface of the inorganic particle is hydrophobized.

15. An electrostatic charge image developer, comprising:
the electrostatic charge image developing toner according to claim 1 ; and
a carrier.

16. The electrostatic charge image developer, according to claim 15 ,
wherein a carrier resistance of the carrier is from 1.0×10 8.0 Ωcm to 1.0×10 15.0 Ωcm, in an electric field of 10 4.8 V/m.

17. The electrostatic charge image developer, according to claim 15 ,
wherein the carrier is a carrier in which a magnetic material is dispersed in a resin.

18. The electrostatic charge image developer, according to claim 17 ,
wherein the magnetic material is a magnetite which is coupling-processed.

19. A toner cartridge, which accommodates the electrostatic charge image developing toner according to claim 1 , and is detachable from an image forming apparatus.

Assignees

• Fuji Xerox Co Ltd

Inventors

• Iwazaki Eisuke
• Fujita Asafumi
• Tanaka Tomoaki
• Sato Narumasa
• Yoshihara Kotaro
• Mizutani Noriyuki

Classifications

• G03G9/0827

  characterised by their shape, e.g. degree of sphericity · CPC title

• G03G9/09716

  treated with organic compounds · CPC title

• G03G9/1131

  Coating methods; Structure of coatings · CPC title

• G03G9/08797

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

• G03G9/08782

  Waxes · CPC title