Eastman-Kodak Company

Chandra Sreekumar

Peter S Alexandrovich

Mridula Nair

Donald Saul Rimai

John W May

Louis J Sorriero

Zona R Pierce

Joseph W Manthey

Disclosed is an improved method of making a hard copy in a process where a latent electrostatic image on an image-bearing substrate is developed by applying to the image a dry thermoplastic toner which comprises a binder polymer, and the developed image is transferred to the surface of a receiver by contacting the developed image on the substrate with the surface, then removing the surface from the substrate. The improvement comprises developing the latent electrostatic image with a toner having a particle size less than 8 micrometers, heating the surface before it contacts the developed image to a temperature such that the surface heats the toner particles when it contacts the developed image to a temperature between 10.degree. C. above the T.sub.g of the toner binder and 20.degree. C. below the T.sub.g of the toner binder, where the temperature is sufficient to fuse discrete toner particles that form the image to each other at points of contact between the particles, but insufficient to cause the contacting particles to flow into a single mass, non-electrostatically transferring the developed image to the surface, where the roughness average of the surface is less than the radius of the particles, and heating the developed image after it has been removed from the substrate to a temperature sufficient to fix it.

Thermally assisted transfer of small electrostatographic toner particles

Disclosed is a method of making particulates. A solution is formed of a solvent. a first polymer having an intrinsic viscosity of at least 0.5, and a second polymer having an intrinsic viscosity of less than 0.5. The solution is atomized with a gas to form droplets of the solution suspended in the gas. The evaporation of the solvent leaves the particles suspended in the gas and the particles are collected to form the toner. Also disclosed is toner made by this method, and a method of making an electrographic printing plate by developing an electrostatic image with the toner, transferring the developed image to a substrate, and fixing the transferred image on the substrate. Also disclosed is an electrographic printing plate made according to that method.

Mixed polymer toner for forming electrographic printing plates

Toner and/or carrier particles are prepared by dissolving a polymer in a solvent which is immiscible with water forming a suspension of small droplets of the polymer and solvent in water containing a promoter and silica particles, removing the solvent from the droplets and separating the solidified particles from the water.

Polymeric powders having a predetermined and controlled size and size

A method of forming an image is disclosed in which chemically active toner particles are used to trigger image amplification chemistry after their attraction to an electrostatic charge pattern. The method of forming an image comprises applying electrographic toner particles to a charge pattern on a support followed by a chemical amplification processing step comprising heating the toner image in the presence of an image-receiving element comprising:

Method of chemical electrographic image amplification using chemically

Liquid electrographic developers are disclosed comprising an electrically insulating liquid carrier, toner, a charge-control agent and a charging agent. The charge-control agent is a carrier-soluble, addition copolymer of a quaternary ammonium salt monomer, a monomer having --COOH, --SO.sub.3 H or --PO.sub.3 HR acidic function wherein R is hydrogen or alkyl, and a solubilizing monomer. The charging agent is a carrier-soluble, addition polar copolymer. The disclosed developers exhibit improved replenishability as evidenced by reduced buildup of charge in the developers during the course of use and repeated replenishment.

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Rochester, NY, United States of America

Chandra Sreekumar