| 摘要 |
PURPOSE:To obtain a high durability carrier not causing deterioration due to formation of spent toner by coating the surface of the core of a carrier with a mixture of a silane coupling agent and a silicone resin, and ehnahcing adhesion to the core material with the coating layer to prevent peeling. CONSTITUTION:An inorganic carrier core material is coated with a coating material contg. a silicone resin and a silane coupling agent represented by formula I in which X is a hydrolyzable group, such as Cl, alkoxy, or acetoxy; Y is vinyl, methacryloyl, epoxy, amino, mercapto, or the like reacting with an org. matrix. and R is 1-20C alkyl or alkylene. An amt. M of silane coupling agent to be added is decided so as to satisfy the conditions represented by the equation II in which C is the weight of the carrier (g); Sc is the surface area of the carrier m<2>/g; and Sm is the min. coating area of the silane m<2>/g. As a result, a high-durability carrier not formng a spent toner is obtained. |
