Resin-coated carrier for electrophotographic developer, and electrophotographic developer

• US 8,541,155 B2
• Filed: 03/28/2012
• Issued: 09/24/2013
• Est. Priority Date: 03/30/2011
• Status: Active Grant

• Current Assignee: Powdertech Co., Ltd.
• Original Assignee: Powdertech Co., Ltd.
• Inventors: Uemura, Tetsuya, Ishikawa, Makoto
• Primary Examiner(s): Dote, Janis L
• Application Number:
  US13/432,360
• Publication Number:
  US 20120251942A1
• Time in Patent Office: 545 Days
• Field of Search: 430/111.35, 430/111.32
• US Class Current: 430/111.35
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: G03G 9/1075 Structural characteristics of the carrier particles, e.g. shape or crystallographic structure
• CPC Class Codes: G03G 9/1085 with non-ferrous metal oxide, e.g. MgO-Fe2O3
• CPC Class Codes: G03G 9/113 having coatings applied thereto
• CPC Class Codes: G03G 9/1135 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/1136 containing silicon atoms

Abstract

There are provided a resin-coated carrier for an electrophotographic developer, in which a magnetic particle is coated with a resin on its surface, and the coating resin contains a carbon nanotube having a carbon content of 75% by weight or more, and an electrophotographic developer using the resin-coated carrier.

Claims

1. A resin-coated carrier for an electrophotographic developer, wherein a magnetic particle is coated with a resin on its surface, and the coating resin comprises a carbon nanotube having a carbon content of 75% by weight or more,

wherein the carbon nanotube has a content of an iron element of 10 to 50% by weight with respect to a total amount of elements excluding carbon.

2. The resin-coated carrier for an electrophotographic developer according to claim 1, wherein the carbon nanotube is contained in 0.1 to 25.0% by weight with respect to a solid content of the coating resin.

3. The resin-coated carrier for an electrophotographic developer according to claim 1, wherein the carbon nanotube has a fiber length of 0.5 to 4.0 μ

m.

4. An electrophotographic developer, comprising a resin-coated carrier according to claim 1, and a toner.

5. An electrophotographic developer, comprising a resin-coated carrier according claim 2, and a toner.

6. An electrophotographic developer, comprising a resin-coated carrier according claim 3, and a toner.