Eastman-kodak Company

Kodak Polychrome Graphics, Gmbh

Thomas R Jordan

Jeffrey James Collins

Ting Tao

Jianbing Huang

Scott A Beckley

Eugene Lynn Sheriff

Ralph Scott Schneebeli

Kevin Barry Ray

Neil F Haley

Eiji Hayakawa

Yasushi Miyamoto

Gary Roger Miller

Paul Richard West

Paul R West

Shashikant Saraiya

John E Walls

John Kalamen

Jeffery Allen Gurney

Joanne Ray

Jianfei Yu

Chris McCullough

Jeffrey Allen Gurney

A radiating-sensitive composition and negative-working imageable element includes a free radically polymerizable component, an initiator composition capable of generating radicals sufficient to initiate polymerization of the free radically polymerizable component upon exposure to imaging radiation, a radiation absorbing compound, and particles of a poly(urethane-acrylic) hybrid that are distributed throughout the composition forming an imageable layer in the element. Imaging can be accomplished at a wide range of wavelengths from about 150 to about 1500 nm, and development can be accomplished using an organic solvent-based developer, warm water, plate cleaner, or on-press using a combination of a lithographic printing ink and a fountain solution.

Negative-working radiation-sensitive compositions and imageable materials

Imageable elements with improved dot stability are disclosed. The imageable elements comprise a layer of an imageable composition over a support. The imageable composition comprises an infrared absorbing compound, an acid generator, an acid activatable crosslinking agent, a polymeric binder, and about 0.01 wt % to 1 wt % of an added onium compound. The elements may be thermally imaged and developed to produce images useful as lithographic printing plates.

Imageable elements with improved dot stability

The present invention provides an imageable composition including an acid curable composition, an acid generator, an infrared absorber having a counter anion derived from a non-volatile acid, and a strong acid such as a sulfonic acid. The imageable composition may include components such as a crosslinkable binder or a colorant. In one embodiment, the imageable composition further includes a colorant having a counter anion derived from a non-volatile acid. The present invention further provides an imageable element, which includes a substrate and an imageable coating on a surface of the substrate. Also provided is method of producing an imaged element according to the invention.

Imageable composition containing an infrared absorber with counter anion derived from a non-volatile acid

A method for forming images useful as lithographic printing plate precursors is disclosed. An imageable element in which the imageable layer comprises an acid generator, a crosslinking agent, and a binder is imaged with ultraviolet radiation and developed with a solvent based developer. The acid generator is an iodonium, sulfonium, or diazonium salt in which the anion is an organic sulfate or thiosulfate anion. The binder comprises a copolymer that contains a reactive pendent group capable of undergoing acid crosslinking, in which the reactive pendent group is hydroxyl, carboxylic acid, sulfonamide, alkoxymethyl, or a mixture thereof. The method is especially suited for use with direct digital ultraviolet imaging devices. The resulting image is useful as a lithographic printing plate.

Method for forming images using negative working imageable elements

The present invention provides an imageable composition, which includes an acid curable composition, an acid generator, a colorant having a counter anion derived from a non-volatile acid, and further optionally, an infrared absorber or photothermal converter material. The present invention further provides an imageable element, which includes a substrate and an imageable composition according to the present invention coated on a surface of the substrate. Also provided is method of producing an imaged element according to the present invention.

Imageable composition containing colorant having a counter anion derived from a non-volatile acid

Infrared absorbing compounds in which the anion is selected from the group consisting of 5-isatinsulfonate, 10-camphorsulfonate, and 4,5-dihydroxy-1,3-benzenedisulfonate are disclosed. Negative-working imageable elements containing these compounds have improved dot stability.

Infrared absorbing compounds and their use in photoimageable elements

Methods for forming images are disclosed. The images are formed by imaging and developing an imageable element comprising a layer of an imageable composition over a substrate. The imageable composition contains a polymeric binder, an acid activatable crosslinking agent, and an acid generator of the structure:

Method for forming a lithographic printing plate

Infrared absorbing compounds and their use in imageable elements

Photosensitive polyesters having dye moieties incorporated into the polyester backbone are disclosed. The photosensitive polyesters contain an unsaturated photosensitive moiety comprising photopolymerizable &mdash;CH&boxH;CH&mdash;CO&mdash; groups and dye moieties derived from dyes that are copolymerizable diols. Negative-working photosensitive elements, such as negative-working printing plates, can be prepared using these photosensitive polyesters.

Photosensitive compositions and elements comprising dyed photosensitive polyesters

A positive-working lithographic printing plate is used to provide a positive image without a post-exposure baking step and without any floodwise exposure steps. The printing plate includes an imaging layer that is imageable using an infrared radiation laser. The imaging layer consists essentially of a phenolic resin and an infrared radiation absorbing compound.

Positive-working printing plate and method of providing a positive image

An infrared imaging composition contains two essential components, namely an infrared absorbing compound, and a phenolic resin that is either mixed or reacted with an o-diazonaphthoquinone derivative. These compositions are useful in photosensitive elements such as lithographic printing plates that can be adapted to direct-to-plate imaging procedures.

Infrared-sensitive, negative-working diazonaphthoquinone imaging

An infrared imaging composition contains two essential components, namely an infrared radiation absorbing compound, and a phenolic resin that is either mixed or reacted with an o-diazonaphthoquinone derivative. These compositions are useful in photosensitive elements such as lithographic printing plates that can be used to provide images using laser imaging, followed by uniform exposure and development.

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Windsor, CO, United States of America

Thomas R Jordan