Xerox Corporation

Other

Edward J Gutman

Scott M Silence

John R Laing

Santokh Singh Badesha

Arnold W Henry

George J Heeks

Thomas R Hoffend

Richard L Schank

Bernard Grushkin

Joo T Chung

Merlin E Scharfe

William H Hollenbaugh, Jr

J Stephen Kittelberger

Mark James Hirsch

James M Proper

Don B Jugle

John G VanDusen

Suresh K Ahuja

Michael L Grande

Joseph R Weber

John G Ruhland

James G Stenzel

Jeffrey H Sokol

Charles D Zimmer

Morris M DeYoung, Jr

Guerino G Sacripante

Hadi K Mahabadi

Robert D Bayley

Robert J Gruber

Paul C Julien

Douglas A Lundy

Timothy L Lincoln

Hui Chang

K Derek Henderson

Deepak R Maniar

Michael J Duggan

Ronald J Koch

Peter F Erhardt

Kip L Jugle

Sheau V Kao

Gerald R Allison

James A Winters

Donald J Goodman

Roger Derek Masham

Neil A Frankel

Amy L Stamp

John L Haack

Thomas J Budny

Larry G Hogestyn

Yelena Shapiro

Brian E Moore

James J Franzen

Brian S Giannetto

Kallis H Mannik

Rudolph Forgensi

John S Walters

Robert A Carter

Barbara M Ferguson

Mark D Ballou

Maria M Barden

Ian Brailsford

Michael Cellini, Jr

Jeffrey L DeBarr

Raymond R Wells

Donald H Wood

Robert J Turchetti

Frank O Reitze

Winters James A A

A process for crosslinking an image comprising applying ultraviolet light to an image comprised of a toner containing an unsaturated resin and colorant.

Curing processes

A composition comprised of resin and colorant, and wherein the colorant is stabilized with an ultra-violet stabilizer.

Toner compositions

An emulsion aggregation toner particularly adapted for use in hybrid scavengeless development includes toner particles of polymer binder, colorant and a surface additive package containing at least one additive negatively chargeable to a carrier and at least one additive positively chargeable to the carrier. The toner is able to exhibit high stable triboelectric charging ability, and substantially eliminates charge through and slow admix in a developer employing the toner.

Emulsion aggregation toner particles coated with negatively chargeable and positively chargeable additives and method of making same

A toner of toner particles containing at least one binder, at least one color ant, and an external additive package comprised of zinc stearate and at. least one of silicon dioxide or titanium dioxide, wherein the amount of zinc stearate is limited to about 0.10 percent by weight or less of the toner. It has been surprisingly found that when the amount of zinc stearate is so limited, a developer formed from the toner exhibits excellent triboelectric charging and stability and excellent developer flow. When the developer is used in a magnetic brush development system, consistent, high quality copy images are formed substantially without any depletion defects over time.

Toner and developer for magnetic brush development system

At least three differently colored toners, designed for use together in forming a color image in an image developing device, have substantially the same melt flow index value. By substantially matching the melt flow index values of at least three toners of a set of toners, it has been found that the resultant color image has an overall excellent image quality, i.e., an excellent overall gloss level without any gloss banding. The toners may be made to have substantially the same melt flow index value in a carefully controlled process that includes forming a single toner by feeding at least one binder and at least one colorant into a mixing device to form a mixture, upon exit of the mixture from the mixing device, measuring a rheology property of the mixture with at least one monitoring device, and comparing the measured rheology property to a target property range that the measured rheology property must be within in order for the single toner to achieve the desired melt flow index value, wherein if the measuring indicates that the rheology property is outside of the target property range, feed amounts of the at least one binder or of the at least one colorant into the mixing device are adjusted, grinding the mixture, optionally together with a portion of one or more external additives to be added to the mixture, classifying the ground mixture, mixing the classified mixture with one or more external surface additives to obtain the single toner having the desired melt flow index value, and repeating the steps for each additional differently colored toner.

Color-blind melt flow index properties for toners

A toner composition comprised of binder, colorant, and a surface additive of a coated silica and wherein said silica possesses a BET surface area, in m /g of from about 35 to about 65, a bulk density, in grams/liter, of from about 40 to about 60, and and wherein the size diameter determined from the BET measurement is from about 20 to about 100 nanometers.

A toner of toner particles containing at least one binder, at least one colorant, and preferably one or more external additives is advantageously formed into a developer and used in a magnetic brush development system to achieve consistent, high quality copy images. The toner particles, following triboelectric contact with carrier particles, exhibit a charge per particle diameter (Q/D) of from 0.6 to 0.9 fC/&mgr;m and a triboelectric charge of from 20 to 25 &mgr;C/g. The toner particles preferably have an average particle diameter of from 7.8 to 8.3 microns. The toner is combined with carrier particles to achieve a developer, the carrier particles preferably having an average diameter of from 45 to 55 microns and including a core of ferrite substantially free of copper and zinc coated with a coating comprising a polyvinylidenefluoride polymer or copolymer and a polymethyl methacrylate polymer or copolymer.

A toner composition comprised of binder, colorant, and a surface additive of a coated silica and wherein said silica possesses a BET surface area, in m,/g of from about 35 to about 65, a bulk density, in grams/liter, of from about 40 to about 60, and wherein the size diameter determined from the BET measurement is from about 20 to about 100 nanometers.

A process for producing a color toner or developer composition includes selecting at least two different color toners, in the form of toner pellets, mixing the color toner pellets to form a mixture, and grinding the color toner pellets to produce a final powdered toner composition of a specific customer selectable color. The powdered color toner composition may then be mixed with additional additives and/or developer carrier particles to produce a developer composition.

Blended custom color toners and developers

A toner comprised of resin, colorant and a surface additive mixture comprised of two coated silicas, and a coated metal oxide.

Toner and developer compositions

An apparatus and process for reducing accumulation of toner from the surface of an electrode member in a development unit of an electrostatographic printing apparatus by providing an organic coating on at least a portion of the electrode member.

Organic coated development electrodes and methods thereof

An apparatus for reducing accumulation of toner from the surface of an electrode member in a development unit of an electrostatographic printing apparatus which includes providing a low surface energy coating on at least a portion of the electrode member.

Coated development electrodes and methods thereof

A developer composition containing color toner particles, bare carrier core particles and coated carrier particles.

Color developer compositions containing bare carrier cores and coated

An apparatus and method for determining both the breakdown voltage and the conductivity of a particulate material, such as a developer material, is provided. In a preferred embodiment, the apparatus for determining breakdown voltage comprises a breakdown cell for storing a preselected quantity of the particulate material and a voltage breakdown ('VB') autometer, the VB autometer being adapted to apply a first voltage across at least portions of the preselected quantity of the particulate material. The VB autometer is capable of progressively varying the magnitude of the first voltage. A measuring circuit, for measuring a second voltage, is coupled to the voltage breakdown cell. When the second voltage substantially equals a preselected reference voltage, the first voltage substantially equals the breakdown voltage of the particulate material.

Apparatus and method for determining the voltage breakdown and

A printing machine of the type including an image receiving member having a charge retentive surface with a first developed image being disposed in a first zone and a second developed image being disposed in a second zone is provided. The printing machine preferably including a corona generator positioned adjacent the charge retentive surface and characterized by an electrical parameter; a first control device for setting the electrical parameter to a first level for disposing the first developed image at a first charge level as the first developed image is passed by the corona generator; a second control device for changing the electrical parameter to a second level for disposing the second developed image at a second charge level as the second developed image is passed by the corona generator; and a cleaning member, contacting the charge retentive surface, for substantially removing both the first developed image and a portion of the second developed image from the the charge retentive surface, wherein the capacity of the cleaning member to remove the first developed image and the portion of the second developed image from the charge retentive surface depends on the magnitudes of the first and second levels.

Apparatus and method for removing developer material

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Webster, NY, United States of America

Edward J Gutman