Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 9,851,648 B2
• Filed: 05/31/2016
• Issued: 12/26/2017
• Est. Priority Date: 06/25/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nishi, Masashi, Sekido, Kunihiko, Sekiya, Michiyo, Tagami, Kei, Kawata, Isao, Ito, Yuto, Saitoh, Akihito
• Primary Examiner(s): VAJDA, PETER L
• Application Number:
  US15/169,418
• Publication Number:
  US 20160377999A1
• Time in Patent Office: 574 Days
• CPC Class Codes: G03G 15/75 Details relating to xerographic drum, band or plate, e.g. replacing, testing electrographic recording members per se G03G5/00
• CPC Class Codes: G03G 21/18 using a processing cartridge , whereby the process cartridge comprises at least two image processing means in a single unit
• CPC Class Codes: G03G 5/142 Inert intermediate layers

Abstract

The present invention provides an electrophotographic photosensitive member that allows positive ghost to be reduced even in repeated use. The electrophotographic photosensitive member of the present invention is an electrophotographic photosensitive member wherein an undercoat layer contains a polymerization product of a composition including a compound represented by the following formula (1).

Claims

1. An electrophotographic photosensitive member comprising a support and an undercoat layer formed on the support, wherein

the undercoat layer comprises a polymerization product of a composition comprising a compound that has a structure represented by formula (1) and that has a polarizability per unit volume according to a density functional approach (B3LYP/6-31+G**), of 0.533 to 0.594:

2. The electrophotographic photosensitive member according to claim 1, wherein the polarizability per unit volume according to a density functional approach (B3LYP/6-31+G**) is 0.545 to 0.577.

3. The electrophotographic photosensitive member according to claim 1, wherein R¹ represents a substituted alkyl group and the substituent corresponds to two or more hydroxy groups or carboxyl groups.

4. The electrophotographic photosensitive member according to claim 1, wherein the composition comprises at least one crosslinking agent selected from the group consisting of an isocyanate compound having an isocyanate group or a block isocyanate group and an amine compound having an N-methylol group or an alkyl-etherified N-methylol group.

5. The electrophotographic photosensitive member according to claim 1, wherein the composition further comprises a resin containing at least one polymerizable functional group selected from the group consisting of a hydroxy group, a thiol group, an amino group, a carboxyl group and a methoxy group.

6. The electrophotographic photosensitive member according to claim 4, wherein a mass ratio of the compound represented by the formula (1) to the crosslinking agent and/or the resin having a polymerizable functional group is 100:

50 to 100;

250.

7. A process cartridge that integrally supports an electrophotographic photosensitive member, and at least one unit selected from the group consisting of a charging unit, a developing unit, a transfer unit and a cleaning unit, and that is detachable from a main body of an electrophotographic apparatus, wherein

the electrophotographic photosensitive member comprises

a support and an undercoat layer formed on the support, and

the undercoat layer comprises a polymerization product of a composition comprising a compound that has a structure represented by formula (1) and that has a polarizability per unit volume according to a density functional approach (B3LYP/6-31+G**), of 0.533 to 0.594:

8. An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging unit, an exposure unit, a developing unit and a transfer unit, wherein

the electrophotographic photosensitive member comprises

a support and an undercoat layer formed on the support, and

the undercoat layer comprises a polymerization product of a composition comprising a compound that has a structure represented by formula (1) and that has a polarizability per unit volume according to a density functional approach (B3LYP/6-31+G**), of 0.533 to 0.594: