Carrier for electrophotography, two-component type developer for electrostatic images, process for producing carrier for electrophotography, and image forming method

摘要

A carrier for electrophotography comprises a carrier core material and a coating resin material with which the surface of the carrier core material is coated. The carrier core material has a binder resin and fine magnetic material particles dispersed in the binder resin. The coating resin material contains at least one of the following members: (a) a vinyl copolymer having a hydroxyl value of from 1 to 100 (KOHmg/g); (b) a styrene-acrylic copolymer having an acrylic component in a monomer percentage of from 30% by weight to 90% by weight, a weight average molecular weight (Mw) of from 30,000 to 70,000 and a weight average molecular weight/number average molecular weight (Mw/Mn) of from 2 to 10; and (c) an insulating resin and a quaternary ammonium salt represented by the following Formula (I): <IMAGE> (I) wherein R1, R2, R3 and R4 may be the same of different and each represent an alkyl group, an aryl group or an aralkyl group; and A represents an organic anion or a polyacid ion.