Electrophotographic photoreceptor

Patent metadata

Field	Value
Publication number	US-11237495-B2
Application number	US-201916591777-A
Country	US
Kind code	B2
Filing date	Oct 3, 2019
Priority date	Oct 22, 2018
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

There is provided an electrophotographic photoreceptor obtained by sequentially laminating at least a photosensitive layer and an outermost layer on a conductive support, wherein the outermost layer contains a polymerized and cured product of a composition containing a polymerizable monomer and a filler, and the filler includes a conductive first filler surface-treated with a surface treatment agent having a silicone chain in a side chain, and a second filler having a relative dielectric constant which is lower than that of the first filler and 5 or less.

First claim

What is claimed is:

1. An electrophotographic photoreceptor obtained by sequentially laminating at least a photosensitive layer and an outermost layer on a conductive support, wherein
the outermost layer contains a polymerized and cured product of a composition containing a polymerizable monomer and a filler,
the filler includes a conductive first filler surface-treated with a surface treatment agent having a silicone chain in a side chain, and a second filler having a relative dielectric constant which is lower than that of the first filler and 5 or less, and
the surface treatment agent is bonded to the first filler by reacting a functional group of the surface treatment agent with the first filler, and the functional group is selected from the group consisting of a carboxylic acid group, a hydroxy group, —Rd-COOH wherein Rd represents a bivalent hydrocarbon group, an alkylsilyl group, a halogenated silyl group, and an alkoxysilyl group.

2. The electrophotographic photoreceptor according to claim 1 , wherein the second filler is a filler formed of silica.

3. The electrophotographic photoreceptor according to claim 1 , wherein the conductive first filler surface-treated with the surface treatment agent having the silicone chain in the side chain has a group derived from a polymerizable group.

4. The electrophotographic photoreceptor according to claim 1 , wherein the surface treatment agent having the silicone chain in the side chain has a silicone side chain branched from an acrylic main chain.

5. The electrophotographic photoreceptor according to claim 1 , wherein the surface treatment agent having the silicone chain in the side chain has a silicone side chain branched from a silicone main chain.

6. The electrophotographic photoreceptor according to claim 1 , wherein the conductive first filler is formed of composite particles obtained by attaching conductive metal oxide to a surface of a core material.

7. An electrophotographic image forming device comprising:
the electrophotographic photoreceptor according to claim 1 ;
a charger that charges a surface of the electrophotographic photoreceptor;
an exposer that exposes the electrophotographic photoreceptor charged by the charger to form an electrostatic latent image;
a developer that supplies a toner to the electrophotographic photoreceptor on which the electrostatic latent image has been formed to form a toner image;
a transferer that transfers the toner image formed on the electrophotographic photoreceptor; and
a cleaner that removes the toner remaining on a surface of the electrophotographic photoreceptor.

Assignees

• Konica Minolta Inc

Inventors

• Matsusaki Mayuko
• Sakimura Tomoko
• Takao Hiroki
• Ikeda Kengo

Classifications

• G03G5/14795

  Macromolecular compounds characterised by their physical properties · CPC title

• G03G5/14791

  Macromolecular compounds characterised by their structure, e.g. block polymers, reticulated polymers, or by their chemical properties, e.g. by molecular weight or acidity · CPC title

• G03G5/14786

  Macromolecular compounds characterised by specific side-chain substituents or end groups · CPC title

• G03G5/14704

  comprising inorganic material · CPC title

• G03G5/14773 Primary

  Polycondensates comprising silicon atoms in the main chain · CPC title