Toner

Patent metadata

Field	Value
Publication number	US-9715188-B2
Application number	US-201414890144-A
Country	US
Kind code	B2
Filing date	Jul 30, 2014
Priority date	Jul 31, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

The toner comprising a toner particle containing a binder resin and a colorant, an iron oxide particle and an organic-inorganic composite fine particle, wherein the organic-inorganic composite fine particle comprises a vinyl resin particle, and inorganic fine particles which are embedded in the vinyl resin particle, and at least a part of which is exposed at surface of the organic-inorganic composite fine particle; the organic-inorganic composite fine particle has convexes derived from the inorganic fine particles, and wherein: a coverage ratio of the surface of the organic-inorganic composite fine particle with the inorganic fine particle is 20-70%; and the content of the iron oxide particle present on a surface of the toner particle is 0.1-5.0 mass % based on the mass of the toner particle.

First claim

The invention claimed is:

1. A toner comprising:
a toner particle containing a binder resin and a colorant;
an iron oxide particle;
an inorganic fine particle “a” selected from the group consisting of a silica particle, a titanium oxide particle and an alumina particle; and
an organic-inorganic composite fine particle, the organic-inorganic composite fine particle comprising a vinyl resin particle and inorganic fine particles “b” which are embedded in the vinyl resin particle, at least a part of said inorganic fine particles “b” being exposed at surface of the organic-inorganic composite fine particle, wherein
the organic-inorganic composite fine particle has convexes derived from the inorganic fine particles,
a coverage ratio A of the toner particle surface with the inorganic fine particle “a” is 45.0 to 70.0%,
a ratio of a coverage ratio B to coverage ratio A is 0.50 to 0.85, when coverage ratio B (%) is a coverage ratio of the inorganic fine particle “a” adhered to the toner particle surface,
a coverage ratio C of the surface of the organic-inorganic composite fine particle with the inorganic fine particles “b” is 20 to 70%, and
the content of the iron oxide particle present on a surface of the toner particle is 0.1 to 5.0% by mass based on the mass of the toner particle.

2. The toner according to claim 1 , wherein the organic-inorganic composite fine particle is contained in the toner in an amount of 0.2 to 5.0% by mass.

3. The toner according to claim 1 , wherein a shape factor SF-2 is 103 to 120 measured using a photograph of an image of the organic-inorganic composite fine particle magnified 200,000 times by a scanning electron microscope, and
a number average particle diameter of the organic-inorganic composite fine particle is 70 to 500 nm.

4. The toner according to claim 1 , wherein the coverage ratio C is 40 to 70%.

5. The toner according to claim 1 , wherein THF-insoluble matter of a resin of the organic-inorganic composite fine particle is 95% or more.

6. The toner according to claim 1 , wherein a primary particle of the inorganic fine particle “a” has a number average particle diameter (D 1 ) of 5 to 25 nm.

7. The toner according to claim 1 , wherein a primary particle of the iron oxide particle has a number average particle diameter of 0.05 to 0.5 μm.

8. The toner according to claim 1 , wherein a primary particle of the inorganic fine particle “a” has a number average particle diameter (D 1 ) of 5 to 25 nm, and
a primary particle of the iron-oxide particle has a number average particle diameter of 0.05 to 0.5 μm.

Assignees

• Canon Kk

Inventors

• Terauchi Kazuo
• Nishikawa Koji
• Tsuda Shohei
• Hotta Yojiro
• Yamazaki Katsuhisa
• Itakura Takayuki
• Naka Takeshi
• Shiozawa Motohide

Classifications

• G03G9/081

  by mixing the toner components in a liquefied state; melt kneading; reactive mixing · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/0827

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

• G03G9/09716

  treated with organic compounds · CPC title

• G03G9/0836

  Other physical parameters of the magnetic components · CPC title