DEVELOPMENT MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE-FORMING DEVICE

摘要

Provided is a developing member capable of suppressing a variation in resistance even when exposed to a high-temperature, high-humidity environment for a long time period. The developing member comprises: a mandrel; an electro-conductive elastic layer provided on a periphery of the mandrel; and a surface layer provided on a surface of the elastic layer, wherein: the elastic layer contains a dimethyl silicone rubber and carbon black; and an amount ± of a hydrogen atom bound to a silicon atom of the dimethyl silicone rubber, and an amount ² of a hydrogen atom of methyl groups bound to a silicon atom of the dimethyl silicone rubber, satisfy a relationship of 2.5×10 -5 ‰¤±/²‰¤1.0×10 -4