Abstract: A method for rounding thermoplastic particles whereby the thermoplastic particles are stirred at a temperature around their plastification temperature, Tplast, together with particles that are larger than the thermoplastic particles and that have a higher specific gravity.

Abstract: A white toner composition comprising 100 parts by weight of a toner resin containing at least 50 parts by weight of a polyester resin and between 65 and 180 parts by weight of rutile type TiO.sub.2, 10 g/m.sup.2 of said non-magnetic toner particles deposited on a transparent foil giving an opacity (hiding power) of at least 60%.

Abstract: A method for coating carrier particles for use in electrostatic developers is provided comprising the steps of:bringing the carrier particles to be coated in a vessel equipped with means for agitating the carrier particles, so that the carrier articles occupy less than 85% by volume of the vessel, and the agitation of the carrier particles is described by a Froude number between 0.2 and 20,adding a solution containing between 6 and 60% by weight with respect to the total volume of the solution of chemical compounds for coating the carrier particles in a solvent with a boiling point of A.degree. C. to the vessel at such a rate that, at any time, the solvent is present in an amount lower than 1.25 10.sup.-4 ml per cm.sup.2 of surface of the carrier particles to be coated,keeping the carrier particles in the vessel at a temperature of at most (A+10).degree. C., andcontinuously evacuating the solvent.