Carrier for a developing agent

摘要

A magnetic carrier for a two-component type developing agent used for the electrophotography, comprising resin-magnetic spherical particles which are formed by the polymerization of a monomer in which a magnetic powder is dispersed and which have a glass transition temperature of higher than 100 DEG C., the surfaces of said resin-magnetic spherical particles being coated with a surface-treated coating layer. Therefore, the surface-treated coating layer on the surfaces of the carriers can be heat-treated at 100 DEG C. or higher. The carrier therefore is light in weight, flowable, and exhibits excellent durability, resistance against the heat and stable electric characteristics irrespective of the passage of time.