Canon Kabushiki Kaisha

Nao Higuchi

Masaki Tsunoda

Mototeru Goto

Yuichi Kikuchi

Atsushi Uematsu

Masatsugu Hongo

An electroconductive member for electrophotography including a support having electro-conductivity and an electroconductive layer on the outer surface of the support, the electroconductive layer including a matrix containing a crosslinked product of a first rubber and first electroconductive particles and domains each containing a crosslinked product of a second rubber and second electroconductive particles, wherein at least part of the first electroconductive particles are present as a primary particle in the crosslinked product of the first rubber, wherein, the first electroconductive particles of the matrix observed in a specific observation region have d1 of 200 nm or more, the second electroconductive particles in the domains observed therein have d2 of 50 nm or less, and 80 number % or more of the domains satisfy specific conditions.

Electroconductive member, process cartridge, and electrophotographic image forming apparatus

A charging roller comprising an electroconductive mandrel and an electroconductive layer as a surface layer, the electroconductive layer including a matrix containing a cross-linked product of a first rubber and domains dispersed in the matrix, each of the domains containing a cross-linked product of a second rubber and an electroconductive particle, the domains each having a volume resistivity lower than a volume resistivity of the matrix, and when sampling a cubic sample of the electroconductive layer having a side of 20.0 &#x3bc;m from a region from an outer surface of the electroconductive layer to a depth of 20.0 &#x3bc;m, 50 number % or more of all the domains in the cubic sample satisfy a specific condition.

Growing community of inventors

Shizuoka, Japan

Nao Higuchi