Developer carrying member comprising a resin coat layer wherein a binder resin of a molecular weight of from 3,000 to 50,000 comprises a copolymer having a methyl methacrylate monomer and a nitrogen containing vinyl monomer

摘要

A developer carrying member (8) for carrying a developer (4) is comprised of a substrate (6) and a resin coat layer (7) which is formed on the surface of the substrate and contains a binder resin and a conductive fine powder. The binder resin is composed of a copolymer having a monomeric unit of a methyl methacrylate monomer M and a monomeric unit of a nitrogen-containing vinyl monomer N. A copolymerization molar ratio of the methyl methacrylate monomer M to the nitrogen-containing vinyl monomer N in the copolymer fulfills the following condition: M:N = 4:1 to 999:1. The binder resin has a weight-average molecular weight Mw of from 3,000 to 50,000.