Patent ID: 9176401
Filing Date: 2015-11-03
Classification: G03G

Abstract:
1. A process of producing an electrostatic image developing carrier, comprising: provisionally calcining a carrier material comprising an iron compound and a magnesium compound at a temperature of from about 800° C. to about 1000° C.; mainly calcining the provisionally calcined carrier material at a temperature of higher than about 1000° C. and not higher than about 1400° C.; and additionally calcining the mainly calcined carrier material at a temperature lower than the temperature of the main calcination to obtain an electrostatic image developing carrier comprising ferrite particles, wherein a content of magnesium in the ferrite particles in the electrostatic image developing carrier is from 4 wt % to 14 wt %, wherein the ferrite particles have a higher magnesium content in a surface portion than in a central portion, and wherein the ferrite particles do not include lithium.