Patent ID: 9513571
Filing Date: 2016-12-06
CPC Classification: G03G

Claim Text:
1. A magnetic carrier, comprising: a resin-filled magnetic core particle, which is constituted by a porous magnetic particle and a resin disposed in pores of the porous magnetic particle; and a resin covering layer provided on a surface of the resin-filled magnetic core particle, wherein a resin for use in the resin covering layer is a copolymer of: wherein the porous magnetic particle has a peak pore diameter of 0.40 μm or more and 0.88 μm or less, the peak pore diameter providing the maximum differential pore volume in the pore diameter range of 0.1 μm or more and 3.0 μm or less, wherein the magnetic carrier has a 50% particle diameter (D50) of 30.0 μm or more and 80.0 μm or less on a volume basis, and an electric current flowing through the magnetic carrier at a voltage of 500 V ranges from 8.0 to 50.0 μA, and wherein a proportion JR wherein the region R wherein the region R