PROCESS FOR PREPARING ELECTROSTATOGRAPHIC CARRIER PARTICLES BY SPRAY DRYING THEREON A THIXOTROPIC COATING OF FUMED SILICA PARTICLES

摘要

Electrostatographic carrier coating compositions which provide porous carrier cores with coatings that are more uniform in thickness and complete in integrity are obtained by employing a thixotropic lacquer. The nature of the thixotropic lacquer is such that its viscosity is low under high shear rates, but high under low shear rates as found during the spreading and penetration of the lacquer on the carrier cores.