Xerox Corporation

Jackie B Parker

Richard P N Veregin

Cuong Vong

Michael Steven Hawkins

Maria N V McDougall

Richard P Veregin

Vladislav Skorokhod

Michael D Thompson

David J Sanders

Deepak R Maniar

Paul Windsor Morehouse, Jr

Thomas C Dombroski

Eric M Strohm

Christopher M Pattison

Mary L Mc Stravick

Shigang S Qui

Rachael L Mc Grath

Maria N V Mc Dougall

Mary B Schlitzer

A developer includes a carrier and a toner, wherein the toner contains toner particles of at least one binder, at least one colorant, and external additives, wherein the developer has a trimmer clogging value in relation to toner triboelectric charge and toner cohesion expressed according to the equation(&#x2212;0.80+0.039&#xd7;(% toner cohesion)+0.026&#xd7;(toner triboelectric charge) (&#x3bc;C/g))of less than or equal to about 3.2.

Developer

A carrier comprised of a core, and thereover a polymer coating containing antimony tin oxide with an average diameter of from about 5 to about 90 nanometers.

Coated carrier

A developer includes black toner particles and carrier particles, the black toner particles including at least one binder, at least one black colorant and one or more external additives, wherein the toner particles comprise from about 7 to about 15 pph of the developer, and wherein the toner particles exhibit a triboelectric charge of from about &#x2212;25 to about &#x2212;50 &#x3bc;C/g at toner particle concentrations of about 7 to about 15 pph of the developer. The developer is ideally suited for use in a high speed (greater than 100 prints per minute) semiconductive magnetic brush development apparatus. Preferably, the black toner particles include a styrene acrylate binder, and the external additives include from about 1.3 to about 2.1% by weight of the toner particles of a first silica having an average particle size of from about 35 to about 45 nm, from about 0.5 to about 1.0% by weight of the toner particles of a second silica having an average particle size of from about 135 to about 160 nm, and from about 0.2 to about 0.5% by weight of the toner particles of a titania having an average particle size of from about 35 to about 45 nm, with an external additive toner surface area coverage of from about 25 to about 45%.

Black toner and developer

A toner process comprising heating a mixture of a latex and a colorant dispersion in the presence of an aggregating agent, and subsequently adding in an amount of at least about 4 weight percent alumina particles, and optionally which particles primarily function as a charge enhancing additive.

Toner processes

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Mississauga, Canada

Jackie B Parker