Eastman-kodak Company

Heidelberger Druckmaschinen Ag

Nexpress Solutions, Inc.

Louis J Sorriero

Dinesh Tyagi

Donald Saul Rimai

Michel Frantz Molaire

David Steven Weiss

Wayne Thomas Ferrar

Marie B O'Regan

Mridula Nair

William A Light

Zona R Pierce

Douglas E Bugner

Joseph A Pavlisko

Daniel Jude Harrison

Elizabeth A Gallo

Ralph H Young

John J Fitzgerald

Edward T Miskinis

Elizabeth G Burns

Donna A DiPrima

Tamara K Osburn

Catherine D Newell

John A Sinicropi

Susan L Dawson

Jane Robin Cowdery-Corvan

Nicholas Zumbulyadis

Sherry L Marlowe

Jane Robin Cowdery

Ludmila S Weiss

Muhammed Aslam

Peter S Alexandrovich

Teh-Ming Kung

Dennis E Smith

Jeanne Ellen Kaeding

Domenic Santilli

William E Yoerger

William T Gruenbaum

Paul M Borsenberger

Anne F Lairmore

James R Bennett

John M McCabe

Xin Jin

Chandra Sreekumar

Albert V Buettner

J Robin Cowdery

Jeffrey R Murray

Jane Robinson Cowdery-Corvan

Disclosed are polymers which include tertiary aryl amine moieties that can function as hole transport agents and which also have reactive silane groups thereon capable of being condensed to a silsesquioxane composition, as well as the silsesquioxane compositions prepared therefrom. The silsesquioxanes can be coated onto substrates to form abrasion-resistant layers having hole transport properties useful in devices that require charge transport properties, such as light-emitting diodes and organic electrophotographic elements such as photoreceptors or photoconductors. Also disclosed are electrophotographic elements which comprise an electrically conducting layer, a charge generating layer overlying the electrically conducting layer, and a charge transport layer overlying the electrically conducting layer. The charge transport layer, which can be an overcoat overlying the charge generating layer, comprises the condensed reaction product of the disclosed polymers.

Organic charge transporting polymers including charge transport moieties and silane groups, and silsesquioxane compositions prepared therefrom

In a process for forming a self-dispersing crystalline phthalocyanine pigment composition of monodisperse nanoparticles, a mixture containing titanyl fluorophthalocyanines, unsubstituted titanyl phthalocyanine, and an organic monomeric dispersant but substantially free of organic solvents or inorganic salts is dry milled, thereby forming a substantially amorphous phthalocyanine pigment composition. The substantially amorphous composition is contacted with an organic solvent having a hydrogen bonding parameter gammalower than about 8, thereby forming a self-dispersing cocrystalline phthalocyanine pigment composition of monodisperse nanoparticles containing titanyl fluorophthalocyanines and titanyl phthalocyanine, which can be used to form the charge generation layer of an electrophotographic element.

Self-dispersing titanyl phthalocyanine pigment compositions and electrophotographic charge generation layers containing same

In a process for forming an amorphous pigment mixture consisting essentially of TiOPc and TiOFPc and containing more than about 75 weight percent of TiOPc, a mixture of crude crystalline TiOPc and TiOFPc pigments in a weight ratio of at least 75:25 TiOPc:TiOFPc is combined with at least about 5 wt. %, based on the total weight of TiOPc and TiOFPc, of an organic milling aid. The mixture is treated under conditions effective to form a substantially amorphous pigment mixture of TiOPc and TiOFPc. The organic milling aid can be separated from the substantially amorphous pigment mixture, which can be converted to a nanoparticulate cocrystalline TiOPc/TiOFPc composition.

Process for forming cocrystals containing chlorine-free titanyl phthalocyanines and low concentration of titanyl fluorophthalocyanine using organic milling aid

Disclosed are photoconductive elements including a conductive support, e.g., an electrically conductive film, drum, or belt, on which a negatively chargeable photoconductive layer is disposed. An electrical barrier layer is disposed between the conductive support and the photoconductive layer. The barrier layer provides a high energy barrier to the injection of positive charges, but transports electrons under an applied electric field. In embodiments, the barrier layer can transport charge by electronic mechanisms, and, is not substantially affected by humidity changes. The barrier layer includes a polyamide-co-imide having covalently bonded as repeat units in the polymer chain, aromatic tetracarbonylbisimide groups of the formula:wherein Arand Arrespectively represent tetravalent or trivalent aromatic groups of 6 to about 20 carbon atoms, and X is O, C(CF), S&#x2550;O or SO. The amount of aromatic tetracarbonylbisimide content in the polymer is selected such that the barrier layer can be coated onto the support as a relatively thick layer, which provides for enhanced performance as a photoconductor when used in an electrophotographic process.

Photoconductive elements having a polymeric barrier layer

Apparatus is disclosed for re-applying dye to a dye donor element of a dye transfer thermal printer. A reservoir contains a supply of dye that is thermally transferred from the reservoir to the dye donor element by diffusion of dye into the dye donor element. The reservoir has a diffusion controlled permeation membrane through which dye is delivered to the dye donor element, while inhibiting diffusion of a binder, whereby the dye diffuses between the reservoir and the dye donor element but the binder does not.

Re-application of dye to a dye donor element of thermal printers

The present invention is an imaging element which includes a support, at least one imaging layer superposed on the support and a protective topcoat superposed farthest from the support. The topcoat includes a binder and lubricant droplets. The lubricant droplets are composed of a lubricant and a water soluble polymer containing heterocyclic aromatic nitrogen groups wherein the droplets are surrounded by a particulate stabilizer. The present invention is also directed to the lubricant droplets.

Lubricating layer in photographic elements

An electrophotographic element comprises: an electrically conducting layer, a charge generating layer overlying the electrically conducting layer, and a charge transport layer overlying the electrically conducting layer. The charge transport layer, which can be an overcoat overlying the charge generating layer, comprises the reaction product in an aqueous medium of a mixture comprising a silsesquioxane polymer and a hole transport compound that comprises a tertiary arylamine containing at least one alcoholic or one phenolic hydroxy substituent.

Silsesquioxane compositions containing tertiary arylamines for hole transport

Polymer and photoconductive element having a polymeric barrier layer

The present invention relates to a binder composition including a polymer formed from at least one vinyl type monomer and at least one water dispersible polyester-ionomer.

Electrophotographic toner binders containing polyester ionomers

In a photoconductive element comprising a conductive support, e.g., an electrically conductive film, drum or belt on which a negatively chargeable photoconductive layer is formed, an electrical barrier layer is formed between the support and the photoconductive layer. The barrier layer provides a high energy barrier to the injection of positive charges but transports electrons under an applied electric field. The barrier layer of the invention transports charge by electronic rather than ionic mechanisms and, therefore, is not substantially affected by humidity changes. The barrier layer comprises a polyester-co-imide, polyesterionomer-co-imide or polyamide-co-imide having covalently bonded as repeating units in the polymer chain, aromatic tetracarboxylbisimide groups of the formula:

Electrophotographic charge generating elements comprise a solid electrolyte layer having improved image discrimination and layer adhesion. The solid electrolyte layer includes a complex of a silsesquioxane and a charge carrier, and is adhered to an underlying photoconductor layer using a primer layer that includes specific addition polymers. This primer layer has a resistivity of at least 10.sup.10 ohms/square and contains substantially no free ACTIVE moieties as defined herein. Such groups, when present in the primer layer, appear to reduce image discrimination.

Electrophotographic charge generating element containing primer layer

A process of forming milled solid particles of a compound comprising milling solid particles of the compound in a liquid organic medium continuous phase in the presence of polymeric milling media to reduce the average size of the compound particles, wherein the liquid continuous phase comprises a solvent for the milling media polymer in the uncrosslinked form and the milling media is crosslinked sufficiently to prevent 50 vol. % swelling of the polymeric milling media in the liquid continuous phase within four hours at 25.degree. C. In various preferred embodiments of the invention, polymeric milling media having a mean particle size of less than about 100 .mu.m in the unswelled state (i.e., prior to addition to the liquid organic continuous phase) is used; the compound particles are milled to an average particle size of less than 100 nm; the compound comprises electrophotographic toner pigment; the liquid continuous phase comprises an ethylenically unsaturated polymerizable monomer; and the milling media polymer comprises polymerized styrene and divinylbenzene monomers. In an additional preferred embodiment of the invention wherein the compound comprises electrophotographic toner pigment and the liquid organic medium continuous phase comprises an ethylenically unsaturated polymerizable monomer, electrophotographic toner particles are formed by polymerizing the ethylenically unsaturated polymerizable monomer after the toner pigment compound is milled. It is a particularly advantageous feature of this invention that there is provided a method of preparing extremely fine solid particles of a compound free of unacceptable contamination and/or discoloration using polymeric milling media in a liquid continuous phase which is an effective solvent for the milling media polymer in uncrosslinked form. It is a further advantage of the invention to allow for preparing electrophotographic toner particles directly from a milled toner pigment particle dispersion without first needing to separate the milled particles from the liquid milling medium continuous phase. The ability to form extremely fine, e.g., less than 100 nm, size pigment particles in accordance with the invention is especially advantageous where toner particles are subsequently formed by suspension polymerization of ethylenically unsaturated monomers after milling of the pigment particles.

Method to media mill particles using crosslinked polymer media and

Growing community of inventors

Rochester, NY, United States of America

Louis J Sorriero