Magnetic toner compositions with surface additives

A negatively charged single component toner consisting essentially of thermoplastic resin, phosphate titanium coated magnetite particles, wax, charge additive and surface additives comprised of colloidal silica and metal oxides;

• and wherein said magnetite particles are present in an amount of from about 15 to about 50 weight percent.

A negatively charged toner comprised of crosslinked resin particles, phosphate titanium coated magnetite particles, low molecular wax components, chromate charge additive and surface additives comprised of a mixture of colloidal silica and strontium titanate.

A toner comprised of particles containing about 60 weight percent of styrene methacrylate copolymer with 51 weight percent styrene, 49 weight percent n-butylmethacrylate, and which resin has been crosslinked with divinytbenzene, 0.05 weight percent, and benzoyl peroxide, 3 weight percent, 32 percent by weight of a phosphate titanium coated magnetite, 5 weight percent of wax, 3 weight percent of charge additive, and as external additives 0.4 weight percent of colloidal silica and 2.5 weight of strontium titanate.

A toner composition consisting essentially of resin particles, a magnetite coated with a phosphate titanium compound, wax, charge additive and a surface additive mixture comprised of silica and metal oxides, and wherein said coating of phosphate titanium is present in an amount of from about 0.5 to about 1.0 percent, and said coated magnetite is present in the toner in an amount of from about 15 to about 50 weight percent.