Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and phthalocyanine pigment

Patent metadata

Field	Value
Publication number	US-9921499-B2
Application number	US-201615334884-A
Country	US
Kind code	B2
Filing date	Oct 26, 2016
Priority date	Oct 28, 2015
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

An electrophotographic photosensitive member includes a substrate and a photosensitive layer containing a phthalocyanine pigment. The crystalline particles of the phthalocyanine pigment have a crystallite correlation length r and a particle size R of 400 nm or less, and a parameter k defined by r/R is in the range of 0.17 to 0.42.

First claim

What is claimed is:

1. An electrophotographic photosensitive member comprising:
a support member; and
a photosensitive layer containing a phthalocyanine pigment comprising crystalline particles having a crystallite correlation length r and a particle size R of 400 nm or less,
wherein a parameter k defined by r/R is in the range of 0.17 to 0.42, and
wherein the phthalocyanine pigment is a hydroxygallium phthalocyanine pigment comprising the crystalline particles, and the crystalline particles have a crystal form exhibiting peaks at Bragg angles 2θ of 7.4°±0.3° and 28.2°±0.3° in a CuKαX-ray diffraction spectrum thereof and contain therein an amide compound represented by formula (A1):

wherein R 1 represents a group selected from the group consisting of a methyl group, a propyl group, and a vinyl group.

2. The electrophotographic photosensitive member according to claim 1 , wherein the crystalline particles have a particle size distribution in which a volume frequency v of occurrence of crystalline particles having a particle size in the range of 60 nm to 200 nm is 80% or more.

3. The electrophotographic photosensitive member according to claim 1 , wherein the amide compound content in the crystalline particles is in the range of 0.1% by mass to 1.4% by mass relative to the mass of the crystalline particles.

4. A process cartridge capable of being removably attached to an electrophotographic apparatus, the process cartridge comprising:
an electrophotographic photosensitive member including a support member and a photosensitive layer containing a phthalocyanine pigment; and
at least one device selected from the group consisting of a charging device, a developing device, and a cleaning device, the at least one device being held together with the electrophotographic photosensitive member in one body,
wherein the phthalocyanine pigment comprises crystalline particles having a crystallite correlation length r and a particle size R of 400 nm or less, and a parameter k defined by r/R is in the range of 0.17 to 0.42, and
wherein the phthalocyanine pigment is a hydroxygallium phthalocyanine pigment comprising the crystalline particles, and the crystalline particles have a crystal form exhibiting peaks at Bragg angles 2θof 7.4°±0.3° and 28.2°±0.3° in a CuKαX-ray diffraction spectrum thereof and contain therein an amide compound represented by formula (A1):

wherein R 1 represents a group selected from the group consisting of a methyl group, a propyl group, and a vinyl group.

5. An electrophotographic apparatus comprising:
an electrophotographic photosensitive member comprising a support member and a photosensitive layer containing a phthalocyanine pigment;
a charging device;
an exposure device; and
a developing device,
wherein the phthalocyanine pigment comprises crystalline particles having a crystallite correlation length r and a particle size R of 400 nm or less, and a parameter k defined by r/R is in the range of 0.17 to 0.42, and
wherein the phthalocyanine pigment is a hydroxygallium phthalocyanine pigment comprising the crystalline particles, and the crystalline particles have a crystal form exhibiting peaks at Bragg angles 2θ of 7.4°±0.3° and 28.2°±0.3° in a CuKαX-ray diffraction spectrum thereof and contain therein an amide compound represented by formula (A1):

wherein R 1 represents a group selected from the group consisting of a methyl group, a propyl group, and a vinyl group.

6. A phthalocyanine pigment comprising crystalline particles, the crystalline particles having a crystallite correlation length r and a particle size R of 400 nm or less, wherein a parameter k defined by r/R is in the range of 0.17 to 0.42,
wherein the phthalocyanine pigment is a hydroxygallium phthalocyanine pigment comprising the crystalline particles, and the crystalline particles have a crystal form exhibiting peaks at Bragg angles 2θ of 7.4°±0.3° and 28.2°±0.3° in a CuKαX-ray diffraction spectrum thereof and contain therein an amide compound represented by formula (A1):

wherein R 1 represents a group selected from the group consisting of a methyl group, a propyl group, and a vinyl group.

7. The phthalocyanine pigment according to claim 6 , wherein the crystalline particles have a particle size distribution in which a volume frequency v of occurrence of crystalline particles having a particle size in the range of 60 nm to 200 nm is 80% or more.

8. The phthalocyanine pigment according to claim 6 , wherein the amide compound content in the crystalline particles is in the range of 0.1% by mass to 1.4% by mass relative to the mass of the crystalline particles.

Assignees

• Canon Kk

Inventors

• Watariguchi Kaname
• Hinata Shoma
• Sakuma Kazuko
• Nishida Tsutomu
• Kuno Jumpei
• Kumoi Hirofumi
• Tanaka Masato
• Kawahara Masataka
• Ito Yuto
• Kawata Isao

Classifications

• C09B47/067

  from phthalodinitriles {naphthalenedinitriles, aromatic dinitriles prepared in situ, hydrogenated phthalodinitrile} · CPC title

• C09B67/0023

  of phthalocyanines · CPC title

• C09B47/045

  Special non-pigmentary uses, e.g. catalyst, photosensitisers of phthalocyanine dyes or pigments · CPC title

• C09B47/04

  Phthalocyanines {abbreviation: Pc} · CPC title

• G03G5/0696 Primary

  Phthalocyanines · CPC title