Triboelectrically controlled covalently dyed toner materials

An electrostatographic developer mixture comprising finely-divided toner particles electrostatically clining to the surface of carrier particles, said carrier particles having an average particle diameter between about 50 microns and about 1,000 microns, and said toner particles having an average particle diameter of less than about 30 microns, said toner particles comprising an aminolyzed polymer selected from the group consisting of styrene-alkylmethacrylate and styrene-alkylacrylate, said polymer being covalently bonded with a reactive dye wherein said toner particles are characterized as possessing controlled triboelectric charging properties provided by the controlled aminolysis of said polymer, and said dye is substantially metabolically inaccessible in said toner particles.

A process for preparing an electrostatographic toner composition for use in developing electrostatic latent images on a recording surface, said process comprising covalently bonding an amonlyzed polymer selected from the group consisting of styrene-alkylmethacrylate and styrenealkylacrylate having pendant reactive sites with a reactive dye, and reducing the average particle diameter of the product to less than about 30 microns to provide toner particles characterized as possessing controlled triboelectric charging properties and wherein said reactive dye is substantially metabolically inaccessible.