| abstract |
PROBLEM TO BE SOLVED: To provide a magnetic substance-containing resin carrier capable of preventing carrier adhesion to a photoreceptor surface and obtaining a high-quality image free from image defects even in an image forming method using an intermediate transfer member. A magnetic substance-containing resin carrier comprising a carrier core containing a resin and a magnetic substance, wherein 1) the true specific gravity is 2.5 to 4.0 g / cm 3 , and 2) an average based on volume distribution The particle size (D50) is 15 μm or more and less than 25 μm, 3) the magnetization intensity under a magnetic field of 10000 / 4π (kA / m) is 40 to 80 Am 2 / kg, and 4) the average circularity C is 0. 850 to 0.950, satisfying the relationship of 0 ≦ (C−C30) ≦ 0.200 with 30% value C30 of circularity, and 5) a projection magnified 1000 times with a scanning electron microscope A magnetic substance-containing resin carrier characterized in that the abundance of a carrier having a recess in its shape is 20.0% by number or less. [Selection figure] None |