Xerox Corporation

Deepak R Maniar

Thomas C Dombroski

Christopher M Pattison

Vladislav Skorokhod

Richard P N Veregin

Michael Steven Hawkins

Victor Berko-Boateng

Mary L McStravick

Angela Schnuerch

Joseph C Mammino

Scott M Silence

Robert J Gruber

Thomas R Hoffend

Michael D Thompson

John A Creatura

Paul C Julien

Eugene Frederick Young

Edward J Gutman

Ronald J Koch

Paul Windsor Morehouse, Jr

Mark A Jackson

Bernard A Kelly

Kevin F Marcell

John G VanDusen

Suresh K Ahuja

Donald J Goodman

John R Laing

Wafa Faisul Bashir

Thomas J Budny

John G Van Dusen

Merrilee A Galloway

Meurig W Williams

Jackie B Parker

Mary L Mc Stravick

Robert A Gill

Rachael L Mc Grath

Shigang S Qui

Richard B McGriff

Timothy J Waldnig

Maria N V Mc Dougall

John T Bickmore

Mary B Schlitzer

C D Zimmer

Richard Phillip Nelson Veregin

Coated carrier particles are provided for use in developer compositions for electrophotographic imaging. The coated carrier particles include a carrier core and a resin coating that includes first and second polymer components. The coated carrier particles exhibit stable triboelectric charging during aging, decreased coating hardness, higher coating coverage, and an improved resilience to toner impaction.

Carrier compositions

Carrier includes a mixture of carrier particles. The mixture may contain first carrier particles containing carrier cores that are coated with a polymer coating, the coating containing polymer and conductive particles, and second carrier particles containing carrier cores that are not coated with a polymer coating. The mixture may contain carrier particles having a conductivity of at least about 5&#xd7;10(ohm-cm)and carrier particles having a conductivity of less than about 1&#xd7;10(ohm-cm).

Carrier particle compositions for xerographic developers

Carrier particles comprise a core and a polymer coating that comprises a mixture of polymethyl methacrlyate (PMMA) and melamine. The coating compositions comprise from about 60 to about 80 percent by weight of PMMA and from about 20 to about 40 percent by weight of melamine. The carriers may be combined with a toner to provide a developer suitable for use in an electrostatographic process. Carriers comprising the PMMA/melamine coatings exhibit increased triboelectric charging, a more conductive carrier, and also contribute to reducing toner cohesion.

Carrier composition

Carrier comprised of a core, a polymer coating, and wherein said coating contains a mixture of an alkali metal lauryl sulfate and a conductive component.

Coated carriers

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

Carrier comprised of a mixture of a first carrier and a second carrier, and wherein the first carrier is comprised of a steel core and the second carrier is comprised of a magnetite.

A carrier comprised of a core and thereover a polymer coating, and which coating is generated by the emulsion polymerization of one or more monomers and a surfactant, and wherein said polymer coating is of a diameter of equal to or less than about 100 nanometers.

Micro-powder coating for xerographic carrier

A process including: heating resin coated core particles for a time until the weight average molecular weight of the resin coating declines.

Carrier coating processes

A carrier for a developer composition includes a steel core having a shape factor of 6 or more coated with a coating at a coating weight of from 0.1 to 3.0% by weight of a total core weight. The coating is most preferably polymethyl methacrylate. The steel core also preferably has an average particle diameter of 70 to 89 micrometers and a size distribution wherein 1.5% or less of a total number of carrier particles have a size less than 38 micrometers. The carrier is preferably used in conjunction with toner particles to form a developer for particular use in devices utilizing hybrid scavengeless development. Use of a carrier in such a developer in a hybrid scavengeless development apparatus enables images to be achieved with properties similar to that achieved in offset lithography.

Carrier and developer providing offset lithography print quality

Carrier composition and processes thereof

A method of preparing a developer composition involves the steps of:

Method of making developer compositions with stable triboelectric

A carrier comprised of a core with a coating thereover comprised of at least one polymer resin and at least one fibrillated or non-fibrillated fibrous carbon additive, and wherein the outer surface of the coated carrier is fibrillated.

Conductive carrier compositions and processes for making and using

A process for controlling A.sub.t transience comprising: providing in a developer housing, a two component developer composition comprising toner particles comprised of a resin, a pigment, a mixture of at least two charge additives, and unpreconditioned coated carrier core particles, wherein the developer is prepared by combining and thereafter blending a mixture of from 1 to about 10 parts by weight of toner particles with from about 100 parts by weight of carrier particles for about 10 minutes to about 30 minutes until an A.sub.t value of from about 60 to about 100 is attained; and forming and thereafter developing electrostatographic latent images on a photoconductive member in a two component development electrostatographic imaging apparatus with the developer composition; wherein the developer composition has an A.sub.t transient of less than about 20 relative units.

Processes for stabilizing developer chargability and imaging processes

Growing community of inventors

Webster, NY, United States of America

Deepak R Maniar