Eastman-kodak Company

David F Jennings

Charles Chester Anderson

Thomas D Weaver

Mridula Nair

Mark Lelental

Henry J Gysling

Mario D DeLaura

David A Niemeyer

Tamara K Jones

Joseph Salvatore Sedita

Anthony D Gingello

Hermano P Rocha

Richard D Lucitte

Benneth C Onuh

Lee William Tutt

Mary Christine Brick

Paul Albert Christian

Myra T Olm

Richard P Henzel

Glenn T Pearce

James R Bennett

Gerald M Leszyk

Ibrahim M Shalhoub

Charels C Anderson

A high density polymer particle includes a cross-linked organic polymer host matrix; and a high density metal provided within the interior of the cross-linked organic polymer host matrix.

High density polymer particles and dispersion of same

An article comprises one or more porous particles. Each porous particle comprises a polymer that provides a continuous solid phase including an external particle surface, and first and second discrete pores that are isolated from each other and dispersed within the continuous solid phase. The porous particle further comprises a first marker material present in the first discrete pores, and a second marker material that is detectably different from the first marker material and is present within the second discrete pores. The marker materials can provide a means for identifying documents, clothing, or other articles as genuine, and providing a detectable security system.

Articles with porous particles for security purposes

Polymeric porous particles have a continuous solid phase and at least two different internal pores that are isolated from each other within the continuous phase. At least one set of discrete pores contains a marker material, and some instances, each set of discrete pores contain different pores marker materials that are isolated from each other. These marker materials are detectably different from each other. The porous particles can be spherical or non-spherical and can be used in any situation where the detectably different marker materials can be evaluated.

Porous particles with multiple markers

A thermally imageable element can be imaged using heat alone without the need for photosensitivity or post-imaging processing. The element contains image-forming chemistry that comprises i) image precursor chemistry and ii) a catalyst or a catalyst precursor that upon imagewise heating is capable of promoting thermally induced image formation with the image precursor chemistry. The image-forming chemistry i) and ii) components are in reactive association and uniformly dispersed or dissolved within a binder in one or more layers of the element. Thus, the element is capable of being thermally addressed to provide a visible image as a result of thermally induced catalytic transformation of the image-forming chemistry.

Thermally imageable elements and processes for their use

Thermographic imaging elements and processes for their use

A thermographic imaging element comprises:

Thermographic imaging composition and element comprising said composition

1. A thermographic imaging element comprising: (a) a support; and

Thermographic imaging element

A thermographic imaging element comprising:

An imaging element for use in an electron-beam-recording process is comprised of a film support having, in order, on one side thereof a conductive layer comprising vanadium pentoxide, an adhesion-promoting hydrophilic colloid layer and an imaging layer. The imaging layer is comprised of an electron-beam-sensitive silver halide emulsion and the vanadium pentoxide is present in the conductive layer in an amount sufficient to impart thereto a resistivity of less than 5.times.10.sup.8 .OMEGA./sq. The imaging element is free of objectionable visual density, UV density and mottle and can be manufactured without the need for organic solvents.

Electron beam recording film with low visual and ultraviolet density

A laser dye-ablative recording element comprising a support having on one side thereof a dye layer comprising an image dye dispersed in a polymeric binder, the dye layer having an infrared-absorbing material associated therewith to absorb at a given wavelength of the laser used to expose the element, the image dye being substantially transparent in the infrared region of the electromagnetic spectrum and absorbing in the region of from about 300 to about 700 nm and not having substantial absorption at the wavelength of the laser used to expose the element, and the other side of the support having thereon a conductive backing layer of resistivity &lt;5.times.10.sup.12 .OMEGA./.quadrature..

Backing layer for laser ablative imaging

An electron-beam-recording process comprises the steps of (1) providing an electron-beam-recording element, (2) introducing the element into a vacuum chamber, (3) imagewise exposing the element within the vacuum chamber to an electron beam and (4) processing the imagewise-exposed element to form a visible image. The electron-beam-recording element comprises a film support having, in order, on one side thereof a conductive layer comprising vanadium pentoxide, an adhesion-promoting hydrophilic colloid layer and an imaging layer. The imaging layer is comprised of an electron-beam-sensitive silver halide emulsion and the vanadium pentoxide is present in the conductive layer in an amount sufficient to impart thereto a resistivity of less than 5.times.10.sup.8 .OMEGA./sq.

Electron beam recording process utilizing an electron beam recording

An electroconductive imaging element, that is especially useful in a high speed laser printing process utilizing electrostatography, is comprised of an insulating support, an electrically-conductive layer overlying the support and a thermoplastic dielectric imaging layer overlying the electrically-conductive layer. The electrically-conductive layer, which is comprised of at least 3 milligrams per square meter of a colloidal gel of vanadium pentoxide dispersed in a polymeric binder combines a high degree of transparency with a high degree of electrical conductivity. The thermoplastic dielectric imaging layer has a thickness of at least 0.2 micrometers and a surface resistivity of at least 10.sup.13 ohms/square and is comprised of a thermoplastic polymer with a glass transition temperature of at least 20.degree. C.

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Penfield, NY, United States of America

David F Jennings