Electrophotographic carrier powder coated by resin dry-mixing process

The process of preparing coated carrier particles useful in electrostatographic developer mixtures for the development of electrostatic latent images, said process comprising the steps of mixing low density, porous, magnetic or magnetically-attractable metal carrier core particles having a gritty, oxidized surface and a surface area of at least about 200 cm.sup.2 /gram and up to about 1300 cm.sup.2 /gram of said carrier particles with from between about 0.05 percent and about 3.0 percent by weight based on the weight of the coated carrier particles, of particulate thermoplastic resin material having a particle size of between about 0.1 micron and about 30 microns, dry-mixing said carrier core particles and said thermoplastic resin material until said thermoplastic resin material adheres to said carrier core particles by mechanical impaction or electrostatic attraction, heating the mixture of carrier core particles and thermoplastic resin material to a temperature of between about 320.degree. F. and about 650.degree. F. for between about 120 minutes and about 20 minutes so that said thermoplastic resin material melts and fuses to said carrier core particles, cooling the coated carrier particles, and classifying said coated carrier particles to the desired particle size.