Kodak Polychrome Graphics, Gmbh

Eastman-kodak Company

Kodak Graphics Communications Canada Company

Kodak Polcyhrome Graphics LLC

Kevin Barry Ray

Anthony Paul Kitson

Christopher David McCullough

Jianbing Huang

Ting Tao

Scott A Beckley

Mark John Spowage

Ken-ichi Shimazu

John Kalamen

Shashikant Saraiya

Eric E Clark

Kevin Wieland

Peter Andrew Reath Bennett

James Laurence Mulligan

Gareth Rhodri Parsons

Stuart Bayes

S Peter Pappas

Jayanti Patel

Heidi M Munnelly

Joanne Ray

Alan Stanley Victor Monk

Paul R West

Frederic E Mikell

Alan Stanley Monk

Eugene Lynn Sheriff

David Stephen Riley

Paul Kitson

John David Riches

Jianfei Yu

Deborah Jane Firth

Celin M Savariar-Hauck

Mathias Jarek

Thomas R Jordan

Hans-Horst Glatt

Richard David Hoare

Andrew Krebs

Alison Jane Brooks

Kevin W Williams

Gary R Miller

Melanie A Felker

Harjit Singh Bhambra

Carole-Anne Smith

Jeffrey James Collins

Eduard Kottmair

Peter Andrew Bennett

Melanie Ann Roth

John Andrew Hearson

Larisa Novoselova

Jian Bing Huang

Stefan Hilgart

Michael S Yates

Martyn Lott

Geoffrey Horne

Kouji Hayashi

Davide F Tenaglia

Chris McCullough

Lee Korionoff

Colin Adrian Wright

Diane Cook

Socrates P Pappas

Ali Cam

Alan S V Monk

Anthony P Kitson

Colin J Griffiths

Frederic Eugene Mikell

An infrared radiation-sensitive positive-working imageable element has a substrate and single imageable layer that includes a first polymeric binder having urethane or urea moieties in its backbone. The first polymeric binder is also insoluble in water and soluble in a weakly alkaline solution. This imageable element can be imaged and processed using weakly alkaline processing solutions that are free of silicates and metasilicates, which processing solutions may also be used to 'gum' the imaged and developed printing surface.

Positive-working imageable elements and method of use

A multi-layer, positive-working lithographic printing plate precursor can be imaged with infrared radiation and processed in a single step using a single processing solution that has a pH greater than 6 and up to about 11. This single processing solution both develops the imaged precursor and provides a protective coating that need not be rinsed off before lithographic printing.

Method of making lithographic printing plates

A negative-working imageable element has an imageable layer and a topcoat layer that contains a composition that will change color upon exposure to imaging infrared radiation. The imageable element can be imaged and developed on-press to provide images with improved contrast for print-out.

On-press developable imageable elements

Negative-working imageable elements that can be imaged using infrared radiation comprise an imageable layer and a protective overcoat on a hydrophilic substrate. The imageable layer includes an IR-sensitive cyanine dye. The protective overcoat predominantly comprises one or more poly(vinyl alcohol) resins, each of which has a hydrolysis level of 85% or less. The use of this particular overcoat composition used in combination with the IR-sensitive cyanine dye provides improved tolerance to fogging by white light while maintaining desired imaging speed.

Negative-working imageable elements and methods of use

An imaged and developed element, such as a lithographic printing plate, is provided by infrared radiation imaging of a negative-working imagable element having an outermost imagable layer that includes a free radically polymerizable component, a free radical initiator composition comprising a diaryliodonium borate, and an infrared radiation absorbing compound. The imagable layer also includes a polymeric binder that is represented by the following Structure (I):-(A)-(A')-&#x2003;&#x2003;(I)wherein A represents recurring units comprising a pendant reactive vinyl group, A&#x2032; represents recurring units other than those represented by A, w is from about 1 to about 70 mol %, and w&#x2032; is from about 30 to about 99 mol %. The imagewise exposed element is developed with a gum to remove only the non-exposed regions. The gum has a pH greater than 7 and up to about 11 and at least 1 weight % of an anionic surfactant.

Methods for imaging and processing negative-working imageable elements

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 relates to negative-working imageable elements that can be used for the manufacture of printing plates. These imageable elements can be developed on on-press by the action of a lithographic printing ink used in combination with either water or a fountain solution. The imageable elements comprise an imageable layer that is not removable in water or fountain solution alone. The imageable layer includes a free radically polymerizable compound, a free radical initiator composition, an infrared radiation absorbing compound, and a polymeric binder comprising poly(alkylene oxide) pendant groups, and preferably additionally pendant cyano groups.

On-press developable negative-working imageable elements

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

Positive-working imageable elements comprise a radiation absorbing compound and inner and outer layers on a substrate having a hydrophilic surface. The inner layer comprises a polymeric material that is removable using an alkaline developer and comprises a backbone and attached groups represented by the following Structure Q: wherein L, L, and Lindependently represent linking groups, T, T, and Tindependently represent terminal groups, and a, b, and c are independently 0 or 1. The imageable elements have improved resistance to development and printing chemicals and solvents.

Multilayer imageable element with improved chemical resistance

Negative-working imageable elements can be imaged and then developed using a lower pH organic-based single-phase developer that is less toxic and corrosive and that can be more readily disposed of after use. This developer has a pH less than 12 and comprises a) an amphoteric surfactant comprising a nitrogen-containing heterocycle, b) an amphoteric surfactant having two or more nitrogen atoms, or c) an amphoteric surfactant of a) and an amphoteric surfactant of b).

Method of imaging and developing negative-working elements

Thermally imageable multilayer imageable elements useful as lithographic printing plate precursors that have good solvent resistance are disclosed. The underlayer of the imageable element comprises an acidic copolymer that comprises, in polymerized form, about 10 mol % to about 75 mol % of one or more monomers of the formula:CH&#x2550;CH(R)-Z-X&#x2014;NH&#x2014;CO&#x2014;NH&#x2014;CH&#x2014;(R)(COH);in which: Ris H or CH; Ris H or OH; Z is &#x2014;CH&#x2014; or &#x2014;C(O) &#x2014;Y&#x2014;; Y is &#x2014;O&#x2014; or &#x2014;NH&#x2014;; and X is selected from &#x2014;C(CH)&#x2014;, &#x2014;CH(CH)&#x2014; and &#x2014;(CH)&#x2014;, in which n is an integer from 1 to 12.

Bakeable multi-layer imageable element

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

Both single-layer and multilayer imageable elements have a substrate and at least one imageable layer. The elements can be used to prepare either negative- or positive-working imaged elements, for example as lithographic printing plates. The imageable elements also include a radiation absorbing compound and a solvent-resistant polymer comprising pendant phosphoric acid groups, pendant adamantyl groups, or both. When this polymer comprises pendant adamantyl groups, they are connected to the polymer backbone through a urea or urethane group. The imageable elements have improved chemical resistance and thermal bakeability from the presence of the unique solvent-resistant polymer.

Imageable members with improved chemical resistance

Single-layer and multilayer imageable elements have a substrate and at least one imageable layer and can be used to prepare positive-working lithographic printing plates. The imageable elements also include a radiation absorbing compound and a solvent-resistant polymer binder comprising an &#x2014;N(R)&#x2014;C(&#x2550;X)&#x2014;N(R')&#x2014;S(&#x2550;O)&#x2014; moiety that is attached to the polymer backbone, wherein X is O or S, R and R&#x2032; are independently hydrogen, halo, or an alkyl group having 1 to 6 carbon atoms. This solvent-resistant polymer binder is located in the imageable layer closest to the substrate and provides improved chemical resistance.

The present invention provides methods of imagewise exposing a thermally sensitive composition formed from a nanopaste comprising inorganic nanoparticles, a carrier, and preferably certain polymeric binders. The composition has been applied to a substrate and treated to improve adhesion. Exposure affects the solubility of exposed portions of the applied and treated layer relative to unexposed portions of the applied layer. The imaged layer is then developed on-press with a fountain solution, lithographic ink, or both, to remove the exposed portions or unexposed portions of the layer to form an image in a printing plate.

Nanopastes for use as patterning compositions

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Fort Collins, CO, United States of America

Kevin Barry Ray