Image forming method and image forming system

Patent metadata

Field	Value
Publication number	US-11415904-B2
Application number	US-202117201507-A
Country	US
Kind code	B2
Filing date	Mar 15, 2021
Priority date	Apr 13, 2020
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

Provided is an image forming method using a toner for developing an electrostatic charge image and an electrophotographic photoreceptor, and containing at least a charging step, an exposing step, a developing step and a transferring step, wherein the electrophotographic photoreceptor has a photosensitive layer, and the photosensitive layer contains a triphenylamine derivative having a specific structure as a charge transport material, and the toner for developing an electrostatic charge image contains at least titanic acid compound particles as an external additive.

First claim

What is claimed is:

1. An image forming method using a toner for developing an electrostatic charge image and an electrophotographic photoreceptor, and comprising at least a charging step, an exposing step, a developing step and a transferring step, wherein the electrophotographic photoreceptor has a photosensitive layer, and the photosensitive layer contains a compound having a structure represented by the following Formula (1) as a charge transport material, and the toner for developing an electrostatic charge image contains at least titanic acid compound particles as an external additive,

in Formula (1), R 1 and R 2 each independently represent an alkyl group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms; k and l each independently represent an integer of 0 to 5; X represents a single bond or an alkylene chain; Y represents a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms or a substituent having a reactive group; and R 1 may be the same or different when k is 2 or more, and R 2 may be the same or different when 1 is 2 or more.

2. The image forming method described in claim 1 , wherein the titanic acid compound particles contain lanthanum.

3. The image forming method described in claim 1 , wherein X of Formula (1) is a group having a structure represented by the following Formula (2), and Y is a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or a group having a structure represented by the following Formula (3) or formula (4),

in Formula (2), m represents an integer of 0 to 5,

4. The image forming method described in claim 1 , wherein the titanic acid compound particles are selected one from the group consisting of strontium titanate particles, calcium titanate particles, magnesium titanate particles, and barium titanate particles.

5. The image forming method described in claim 1 , wherein a number average primary particle diameter of the titanic acid compound particles is in the range of 10 to 100 nm.

6. The image forming method described in claim 1 , wherein a content of the titanic acid compound particles is in the range of 0.1 to 1.0% by mass with respect to the total amount of the toner for developing an electrostatic charge image.

7. The image forming method described in claim 1 , wherein the photosensitive layer comprises a plurality of layers, and contains a compound having a structure represented by Formula (1) in an outermost layer of the photosensitive layer.

8. The image forming method described in claim 7 , wherein the outermost layer is a layer obtained by curing a composition containing a polymerizable compound and the compound having a structure represented by Formula (1).

9. The image forming method described in claim 7 , wherein the outermost layer contains at least one selected from the group consisting of silica particles, tin oxide particles, titania particles, and alumina particles.

10. An image forming system using a toner for developing an electrostatic charge image and an electrophotographic photoreceptor, and having at least a charging step, an exposing step, a developing step and a transferring step, wherein the image forming system performs the image forming method described in claim 1 .

Assignees

• Konica Minolta Inc

Inventors

• Maeda Seisuke

Classifications

• G03G5/14786

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

• G03G5/14704

  comprising inorganic material · CPC title

• G03G5/14795

  Macromolecular compounds characterised by their physical properties · CPC title

• G03G9/09708 Primary

  Inorganic compounds · CPC title

• G03G13/013

  characterised by the developing step, e.g. the properties of the colour developers · CPC title