Patent ID: 8728698
Filing Date: 2014-05-20
Classification: G03G

Abstract:
1. A carrier, comprising: core material particles having magnetism; and a resin coating layer which covers surfaces of the core material particles, wherein a weight average particle diameter of the core material particles is from 22 μm to 32 μm, wherein a proportion of the weight average particle diameter of the core material particles relative to a number average particle diameter is from 1.00 to 1.20, wherein a content of the core material particles having a diameter of 20 μm or smaller is 7% by mass or less, relative to a total mass of the carrier, wherein a content of the core material particles having a diameter of 36 μm or smaller from 90% by mass to 100% by mass, relative to a total mass of the carrier, wherein a particle density of the core material particles relative to a true density of the core material particles is from 85% by mass to 100% by mass, wherein the resin coating layer comprises (i) a cross-linked product of a thermoplastic resin (i-a) and a guanamine resin (i-b), and (ii) hard particles, wherein the thermoplastic resin (i-a) is an acrylic resin, and wherein the hard particles (ii) comprises at least one selected from the group consisting of an Si oxide particle, a Ti oxide particle, and an Al oxide particle, wherein a particle density of the core material particles is from 4.5 g/cm