Imaging system

Claim 1

An imaging process comprising forming an electrostatic latent image on an imaging surface and forming a toner image by contacting said imaging surface with an electrostatographic developing mixture comprising particles, said particles including about 1 part by weight of finely divided toner material having an average particle size less than about 30 microns, from about 10 to about 1,000 parts by weight carrier particles which are grossly larger than said finely divided toner material and from about 0.05 percent to 1.5 percent based on the weight of said toner material of silicon dioxide particles having at least 0.15 silicon atoms per A2 on the surface of said silicon dioxide particles chemically attached through silicon-oxygen-silicon bonding to silicon atoms having one to three hydrophobic organic groups directly attached thereto by silicon-carbon bonding, said silicon dioxide particles having an average particle size of between about one millimicron and about 100 millimicrons, whereby at least a portion of said finely divided toner material is attracted to and held on said imaging surface in conformance to said electrostatic latent image.