| 摘要 |
PROBLEM TO BE SOLVED: To provide magnetic carrier particles and a two-component developer which suppress occurrence of spent and carrier sticking to a photosensitive body, which has excellent fluidity, which prevents leakage of electric charges, and which forms satisfactory images free from irregular sweeping patterns. SOLUTION: Magnetic material distribution type resin carrier is prepared. The magnetic material distribution type resin carrier contains binder resin and metallic compound particles distributed in the binder resin and containing at least magnetic materials. When the rate of the content of metallic compound particles ranges 80 to 99% by means, the intensity of magnetization is 1,000/4πkA/m is 45 to 75 Am<SP>2</SP>/kg, specific resistance when applying voltage which makes electric field intensity of 1,000 V/cm is R1,000 and specific resistance when applying voltage which makes electric field intensity of 3,000 V/cm is R3,000, the magnetic distribution type resin carrier satisfies a relation of 1.0≤log (R1,000)/log (R3,000)≤1.3. This carrier particle and toner containing at least binding resin and coloring agent, and having weight average particle diameter ranging 3 to 10μm are blended to make the two component developer. COPYRIGHT: (C)2004,JPO |
