Electrophotographic developer including a toner of specific...

Details Electrophotographic developer including a toner of specific... Electrophotographic developer including a toner of specific...

G - Physics

03

G

96/52

G03G 9/10 (2006.01) G03G 9/113 (2006.01)

Patent

CA 1132828

ELECTROPHOTOGRAPHIC TONER AND CARRIER ABSTRACT OF THE DISCLOSURE A developer material comprising toner particles and coated carrier beads for use in developing images in an electro- statographic device is disclosed. The toner particles are initially classified according to a size distribution wherein less than 15% by weight are greater than 16 microns, between 7 and 15% by weight are less than 5 microns, the remainder being from 5 to 16 microns; and wherein the median particle size by weight is from 8 to 12 microns. The coating of the carrier beads is a mixed resin system com- prising 5 to 55% by weight polytetrafluoroethylene, 5 to 55% by weight fluoronatedpolyethylenepropylene, and 40% to 80% by weight of a poly (amide-imide) resin which is stable up to at least 600°F, triboelectrically negative (with respect to the herein described toner), nonspalling, essentially nonfriable and dispersible with the other resin components. Also, preferably the coating includes a pigment, such as TiO2, dispersed in the resin system. BO9-77-065

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