Eastman-kodak Company

Heidelberger Druckmaschinen Ag

William T Gruenbaum

David Steven Weiss

Michel Frantz Molaire

Jeanne Ellen Kaeding

Wayne Thomas Ferrar

John C Wilson

Khe C Nguyen

William Mey

Kelly Stephen Robinson

Douglas E Bugner

Teh-Ming Kung

James J Krutak

John W May

Louis J Sorriero

Alexandra DiLauro Bermel

Ralph H Young

Csaba A Kovacs

Edward T Miskinis

Luther C Roberts

Julie P Harmon

Orville C Rodenberg

Martin A Berwick

Michael Frauens

Xin Jin

Chang K Kim

J Robin Cowdery

Robert John Opitz

Paul D VanderValk

Jane Robinson Cowdery-Corvan

Susan E Ribletty

Henry V Issacson

Cataldo A Magguilli

The invention is directed to mixtures of PcTiO and a minor amount of another, substituted titanyl phthalocyanine and the synthesis of mixtures of PcTiO and a minor amount of another, substituted titanyl phthalocyanine. The invention is further directed towards milled pigment compositions of such mixtures, and to use of such milled pigment compositions in an electrophotographic element.

Titanyl phthalocyanine with improved milling properties

The present invention is directed to an electrophotographic element that 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, includes the reaction product in an aqueous medium of a mixture comprising a silsesquioxane polymer and a amine-free surface treated zinc antimonate and an acid scavenger.

Sol gel overcoats incorporating zinc antimonate nanoparticles

The present invention is an electrophotographic photoconductor having a photosensitive layer on a conductive substrate. The photosensitive layer contains trimellitimide esters additives.

Photoconductors containing trimellitimide esters

The present invention is an electrophotographic photoconductor having a photosensitive layer on a conductive substrate. The photosensitive layer contains terephthalate esters additives.

Photoconductors containing terephthalate esters

The present invention is an electrophotographic photoconductor having a photosensitive layer on a conductive substrate. The photosensitive layer contains N-arylphthalimides additives.

Photoconductors containing N-arylphthalimides

The present invention is a photoconductive element that includes an electrically conductive support, an electrical barrier layer disposed over said electrically conductive support, and disposed over said barrier layer, a charge generation layer capable of generating positive charge carriers when exposed to actinic radiation. The barrier layer includes a vinyl polymer with aromatic tetracarbonylbisimide side groups and crosslinking sites.

Vinyl polymer photoconductive 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

Electrophotographic charge generating elements comprise a solid electrolyte layer having improved image discrimination. The solid electrolyte layer includes a complex of a silsesquioxane and a charge carrier, and further includes nondiffusible acid scavengers in an amount of at least 0.2 weight %. The acid scavengers are nondiffusible tertiary arylamines having a pKa of at least 4.

Electrophotographic charge generating element containing acid scavenger in overcoat

An ink jet printing method is described. It comprising the steps of: providing an ink jet printer that is responsive to digital data signals; loading the printer with ink receptive substrates; loading the printer with an aqueous ink jet ink, said ink A) comprising a pigment, an aqueous carrier and potassium N-methyl-N-oleoyl taurate; and B) having a surface tension of 20 to 60 dynes/cm at 25.degree. C., a viscosity of 1 to 10 centipoise at 25.degree. C. and a particle size of less than 1.0 .mu.m; and printing on the ink receptive substrate in response to the digital data signals.

Potassium N-methyl-N-oleoyl taurate as a dispersant in pigmented ink jet

A cyan pigment, bis(phthalocyanylalumino)tetraphenyldisiloxane is prepared in a single reaction mixture. A phthalonitrile is reacted at high temperature with an aluminum salt in the presence of an ammonia donor such as urea, in an inert, high boiling organic solvent. The resulting reaction product is cooled and without isolation, refluxed in an aqueous solution of a pyridine compound containing dichlorodiphenylsilane. The desired cyan pigment is then isolated.

Synthesis of bis(phthalocyanylalumino)tetraphenyldisiloxanes

Phthalocyanine compositions and prepartion methods. In a method, first, a phthalocyanine mixture is synthesized that has a plurality of differently substituted phthalocyanines selected from the group consisting of compounds having the general structure: ##STR1## M represents a pair of hydrogen atoms or a covalent or coordinate bonded moiety including a metal atom. Each T substituent is independently selected from the group consisting of H, F, Cl, Br, I, and alkyl having from 1 to 18 carbons. There are at least two different T substituents. The smallest T substituent has a van der Waal's radius that differs from the radius of the largest T substituent by less than about 50 percent of the radius of the smallest substituent. The amorphousness of the phthalocyanine mixture is then imcreased. The amorphous mixture is then contacted with organic solvent having a gamma.sub.c hydrogen bonding parameter of less than 8.0. Prior to the contacting, the amorphous mixture is excluded from contact with organic solvent having a gamma.sub.c hydrogen bonding parameter greater than 9.0.

Non-uniformly substituted phthalocyanine compositions preparation

Titanyl fluorophthalocyanines, and electrophotographic elements, and a method for preparing titanyl fluorophthalocyanine having the steps of: dissolving titanyl fluorophthalocyanine in acid to form a solution; admixing the solution and water to precipitate out amorphous titanyl fluorophthalocyanine; washing the amorphous titanyl fluorophthalocyanine until substantially all of the acid is removed; and retaining the amorphous titanyl fluorophthalocyanine under ambient conditions of wetness/dryness and temperature exclusive of conditions combining both dryness and a temperature of greater than about 50.degree. C.

Preparation of titanyl fluorophthalocyanines

This invention provides: A photoconductor element comprising:

Cyclic bis-dicarboximide electron transport compounds for

The present invention is directed to the use of sulfonamido or amido substituted phthalocyanine dyes in optical recording. The dyes are particularly useful in making recordable compact disks. The dyes have acceptable performance yet are easy to make.

Sulfonamido or amido substituted phthalocyanines for optical recording

An electrophotographic coating composition comprising finely-divided photoconductive perylene pigment dispersed in a solvent solution of polymeric binder is prepared by the steps of (1) milling a perylene pigment with milling media comprising inorganic salt and non-conducting particles under shear conditions in the substantial absence of the solvent to provide pigment having a particle size up to 0.2 micrometer, (2) continuing the milling at higher shear at a temperature up to about 50.degree. C., to achieve a perceptible color change of the pigment particles, (3) rapidly reducing the temperature of the milled pigment by at least 10.degree. C., (4) separating the milled pigment from the media and (5) mixing the milled pigment with the solvent solution of polymeric binder to form the coating composition. A very high degree of dispersion of photoconductive perylene pigment in solvent solution of polymeric binder is achieved by this method.

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Rochester, NY, United States of America

William T Gruenbaum