Emulsion aggregation black toner and developer with superior...

Details Emulsion aggregation black toner and developer with superior... Emulsion aggregation black toner and developer with superior...

G - Physics

03

G

G03G 9/087 (2006.01) G03G 15/00 (2006.01)

Patent

CA 2506018

A black toner of toner particles including at least one binder, at least one black colorant, and a package of external additives is described, wherein the at least one binder includes a styrene acrylate binder and wherein the external additives include each of a first silica having an average particle size of from about 35 to about 45 nm, a second silica having an average particle size of from about 135 to about 160 nm, and a titania having an average particle size of from about 35 to about 45 nm. Also described is a developer that includes the black toner and carrier particles comprising a core of ferrite coated with a coating comprising a polymethyl methacrylate polymer and fluoro-copolymer, carbon black and melamine beads. The black toner and developer are preferably used in a semiconductive magnetic brush development system.

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