Mechanically viable developer materials

An electrostatographic developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles having an average diameter from between about 30 microns and about 1,000 microns, said carrier particles comprising a core having an outer coating, said outer coating comprising a mixture of poly(2-vinyl-pyridine) and polyurethane.

An electrostatographic imaging process comprising the steps of forming an electrostatic latent image on a recording surface and developing said latent image by contacting said recording surface with a developer mixture comprising finely-divided toner particles electrostatically clinging to the surface of carrier particles, said carrier particles having an average diameter from between about 30 microns and about 1,000 microns, said carrier particles comprising a core having an outer coating, said outer coating comprising a mixture of poly(2-vinyl-pyridine) and polyurethane, whereby at least a portion of said finely-divided toner particles are attracted to and deposited on said recording surface in conformance with said electrostatic latent image.