Developing member, process cartridge, and electrophotographic apparatus

摘要

A high-quality developing member which excels in filming resistance and excels in leak resistance despite high electroconductivity is provided. The developing member includes an electroconductive substrate, an elastic layer formed on the substrate, and a surface layer which covers a surface of the elastic layer. The surface layer includes a first resin which has, between two adjacent urethane linkages, a structure represented by the structural formula (1) and one or both of structures selected from the group consisting of a structure represented by the structural formula (2) and a structure represented by the structural formula (3), a second resin which has a structure represented by the structural formula (4) and one or both of structures selected from the group consisting of a structure represented by the structural formula (5) and a structure represented by the structural formula (6), and an electronically conductive filler.

主权项

1. A developing member comprising an electroconductive substrate, an elastic layer formed on the substrate, and a surface layer which covers a surface of the elastic layer, wherein
the surface layer comprises a first resin, a second resin, and an electronically conductive filler, the first resin has,
between two adjacent urethane linkages,a structure represented by the following structural formula (1), andone or both of structures selected from a structure represented by the following structural formula (2) and a structure represented by the following structural formula (3), and the second resin has
a structure represented by the following structural formula (4), andone or both of structures selected from a structure represented by the following structural formula (5) and a structure represented by the following structural formula (6): where R1 represents a hydrogen atom or a methyl group, and R2 represents a straight chain or branched alkyl group having 1 to 4 carbon atoms; where R3 represents a hydrogen atom or a straight chain or branched alkyl group having 1 to 4 carbon atoms; and where R4 represents a hydrogen atom or a methyl group, R5 represents an alkylene group having 1 to 4 carbon atoms, and R6 represents a hydrogen atom or a straight chain or branched alkyl group having 1 to 4 carbon atoms.