Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 9,766,561 B2
• Filed: 03/22/2016
• Issued: 09/19/2017
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takahashi, Koji, Ichihashi, Naoaki, Shimada, Tsuyoshi
• Primary Examiner(s): Chapman, Mark A
• Application Number:
  US15/077,185
• Publication Number:
  US 20160291488A1
• Time in Patent Office: 546 Days
• Field of Search: 430 5805, 430 96
• CPC Class Codes: G03G 2215/00957 Compositions
• CPC Class Codes: G03G 5/047 characterised by the charge-generation layers or charge transport layers G03G5/0433 and G03G5/0436 take precedence
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/07 Polymeric photoconductive materials

Abstract

The present invention provides an electrophotographic photosensitive member including a support, and a photosensitive layer on the support. The photosensitive layer has a charge generating layer containing a charge generating material and a charge transporting layer containing a charge transporting material, in this order. The charge transporting layer contains (α) a specific polycarbonate resin or a specific polyester resin, (β) the charge transporting material, (γ) a methoxybenzene, and (δ) a methoxybenzene, a methoxycyclohexane or a methylhexanol having a substituent. The content Wδ of the (δ) is 0.001% by mass or more and 1% by mass or less based on the total mass of the charge transporting layer.

Claims

1. An electrophotographic photosensitive member comprising:

a support, and

a photosensitive layer on the support, the photosensitive layer comprising a charge generating layer containing a charge generating material, and a charge transporting layer containing a charge transporting material, in this order, wherein

the charge transporting layer contains;

(α

) at least one selected from the group consisting of a polycarbonate resin having a structural unit represented by formula (A), and a polyester resin having a structural unit represented by formula (B);

(β

) the charge transporting material;

(γ

) a methoxybenzene; and

(δ

) at least one compound selected from the group consisting of a methoxycyclohexane, and a methoxybenzene having a methyl group or an ethyl group as a substituent, the content Wδ

of (δ

) being 0.001 to 1% by mass based on the total mass of the charge transporting layer;

2. The electrophotographic photosensitive member according to claim 1, wherein the methoxybenzene having a methyl group or an ethyl group as a substituent is methoxytoluene.

3. The electrophotographic photosensitive member according to claim 1, wherein the content Wγ

of (γ

) is 0.001 to 2% by mass based on the total mass of the charge transporting layer.

4. The electrophotographic photosensitive member according to claim 1, wherein the content Wγ

of (γ

) is 0.001 to 1% by mass based on the total mass of the charge transporting layer,

the content Wδ

of (δ

) is 0.001 to 0.5% by mass based on the total mass of the charge transporting layer, and

the ratio Wγ

/Wδ

of the content Wγ

of (γ

) to the content Wδ

of (δ

) is 0.5 to 200.

5. The electrophotographic photosensitive member according to claim 1, wherein (β

) is a compound having a structure represented by formula (E);

6. A process cartridge detachably attachable to a main body of an electrophotographic apparatus, wherein the process cartridge integrally supports an electrophotographic photosensitive member;

and at least one device selected from the group consisting of;

a charging device for charging the electrophotographic photosensitive member,

an exposing device for forming an electrostatic latent image on the surface of the electrophotographic photosensitive member by irradiating the surface of the electrophotographic photosensitive member with exposure light,

a developing device for forming a toner image on the surface of the electrophotographic photosensitive member by toner development of the electrostatic latent image, and

a transfer device for transferring the toner image from the surface of the electrophotographic photosensitive member to a transfer material, and a cleaning device for cleaning the surface of the electrophotographic photosensitive member;

the electrophotographic photosensitive member comprising;

a support, and

a photosensitive layer on the support, the photosensitive layer comprising a charge generating layer containing a charge generating material, and a charge transporting layer containing a charge transporting material, in this order, wherein

the charge transporting layer contains;

(α

) at least one selected from the group consisting of a polycarbonate resin having a structural unit represented by formula (A), and a polyester resin having a structural unit represented by formula (B);

(β

) the charge transporting material;

(γ

) a methoxybenzene; and

(δ

) at least one compound selected from the group consisting of a methoxycyclohexane, and a methoxybenzene having a methyl group or an ethyl group as a substituent, the content Wδ

of (δ

) being 0.001 to 1% by mass based on the total mass of the charge transporting layer;

7. An electrophotographic apparatus comprising:

an electrophotographic photosensitive member;

a charging device for charging the electrophotographic photosensitive member;

an exposing device for forming an electrostatic latent image on the surface of the electrophotographic photosensitive member by irradiating the surface of the electrophotographic photosensitive member with exposure light;

a developing device for forming a toner image on the surface of the electrophotographic photosensitive member by toner development of the electrostatic latent image; and

a transfer device for transferring the toner image from the surface of the electrophotographic photosensitive member to a transfer material,

the electrophotographic photosensitive member comprising;

a support, and

a photosensitive layer on the support, the photosensitive layer comprising a charge generating layer containing a charge generating material, and a charge transporting layer containing a charge transporting material, in this order, wherein

the charge transporting layer contains;

(α

) at least one selected from the group consisting of a polycarbonate resin having a structural unit represented by formula (A), and a polyester resin having a structural unit represented by formula (B);

(β

) the charge transporting material;

(γ

) a methoxybenzene; and

(δ

) at least one compound selected from the group consisting of a methoxycyclohexane, and a methoxybenzene having a methyl group or an ethyl group as a substituent, the content Wδ

of (δ

) being 0.001 to 1% by mass based on the total mass of the charge transporting layer;