Eastman-kodak Company

Kevin Wieland

Kevin Barry Ray

Heidi M Munnelly

Gary R Miller

Jianbing Huang

Ting Tao

Scott A Beckley

Melanie Kelim

Shashikant Saraiya

Ken-ichi Shimazu

S Peter Pappas

Eric E Clark

Frederic E Mikell

James Laurence Mulligan

Melanie Ann Roth

The present invention provides an imageable element including a lithographic substrate and an imageable layer disposed on the substrate. The imageable layer includes a radically polymerizable component, an initiator system capable of generating radicals sufficient to initiate a polymerization reaction upon exposure to imaging radiation, and a polymeric binder having a hydrophobic backbone and including constitutional units having a pendant group including a hydrophilic poly(alkylene oxide) segment. The imageable element can be developed using an aqueous developer solution. Alternatively, the imageable element can be developed on-press by contact with ink and/or fountain solution.

Water-developable infrared-sensitive printing plate

The present invention provides an aqueous regenerator for addition to an aqueous developer that contains an organic solvent, a dispersing agent and a weak base, and has a pH of between about 8 and less than about 13. The aqueous regenerator includes an organic solvent, dispersing agent, and an effective amount of a strong base such that the regenerator has a greater pH than the developer into which the regenerator is to be added.

Developer regenerators

A radiation-sensitive composition includes a free radically polymerizable component, an initiator composition capable of generating free radicals sufficient to initiate polymerization upon exposure to imaging radiation, an infrared radiation absorbing dye having a tetraaryl pentadiene chromophore, a polymeric binder comprising a polymer backbone to which are directly or indirectly linked poly(alkylene glycol) side chains, and a nonionic phosphate acrylate having a molecular weight of at least 250. This composition can be used to prepare a negative-working imageable element that is sensitive to suitable imaging radiation and can be imaged at relatively low energy and developed either on-press or off-press.

Negative-working imageable elements and methods of use

A method for eliminating unwanted ink-receptive sections in positive working printing plates resulting from shading of the surface layer during exposure by the clamps holding the plate on the exposure apparatus following development of an imagewise exposed precursor. Accordingly the areas that are shaded are identified prior to development and the surface layer is scored in those areas to a depth and density sufficient to result in the scored layer being removed during development but not deep enough to damage the underlying hydrophilic layer.

Method to remove unwanted, unexposed, positive-working, IR radiation sensitive layer

A method of preparing negative-working, single-layer imageable elements improves their storage stability in a humid environment. The method includes enclosing the coated imageable elements in a water-impermeable sheet material that substantially inhibits the transfer of moisture to and from the imageable element. Such imageable elements include a radiation-sensitive composition that includes a radically polymerizable component, an initiator composition to provide radicals upon exposure to imaging radiation, a radiation absorbing compound, and a polymeric binder having poly(alkylene glycol) side chains.

Method of preparing negative-working radiation-sensitive elements

A radiation-sensitive composition includes a radically polymerizable component that comprises carboxy groups, an initiator composition to generate radicals, and a polymeric binder comprising poly(alkylene oxide) segments and optionally pendant cyano groups. This composition can be used to prepare imageable elements such as negative-working, on-press developable printing plate precursors.

Radiation-sensitive compositions and imageable materials

Assemblages that comprise a donor element and a receptor are disclosed. The donor element comprises a binder and particles of a cyanoacrylate polymer. The assemblages can be thermally imaged to form lithographic printing plates.

Imageable elements containing cyanoacrylate polymer particles

A method for forming an image useful as a lithographic printing plate is disclosed. The imageable precursor comprises a water solubilized phenolic resin made up of an insoluble phenolic resin and a surfactant. The precursor can be imaged with an imaging solution, either off press or on press, using ink jet imaging techniques. The resulting imaged precursor can be developed using an aqueous liquid, such as water or a fountain solution, either off press or on press.

Preparation of a printing plate using ink-jet

Co-polymers that contain siloxane groups, imageable elements that comprise the co-polymers, and methods for forming images by imaging and developing the imageable elements are disclosed. The imageable elements are useful as lithographic printing plate precursors that can be developed with water or with fountain solution.

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Greeley, CO, United States of America

Kevin Wieland