Eastman-kodak Company

Larisa Novoselova

Anthony Paul Kitson

Shashikant Saraiya

Frederic E Mikell

Kevin Barry Ray

Eric E Clark

James Laurence Mulligan

Positive-working imageable elements can be used to prepare lithographic printing plates. These elements have at least two layers (inner and outer) arranged on a suitable substrate. The inner layer that is closer to the substrate includes one or more polymeric binders that include pendant oxazoline groups and acid groups that are reactive with the oxazoline groups during a post-baking step after development. The resulting imageable elements are more quickly baked in this manner to provide improved run length and resistant to press chemicals.

Multilayer positive-working imageable elements and their use

A positive-working imageable element comprises inner and outer layers and a radiation absorbing compound such as an IR absorbing dye. The inner layer includes a first polymeric material. The ink receptive outer layer includes a second polymeric binder comprising a polymer backbone and an &#x2014;X&#x2014;C(&#x2550;T)&#x2014;NR&#x2014;S(&#x2550;O)&#x2014; moiety that is attached to the polymer backbone, wherein &#x2014;X&#x2014; is an oxy or &#x2014;NR'&#x2014; group, T is O or S, R and R&#x2032; are independently hydrogen, halo, or an alkyl group having 1 to 6 carbon atoms. After thermal imaging, the element can be developed using an alkaline developer. Use of the particular second polymeric binder reduces sludging in the developer. Its dissolution rate in the developer is slow enough to resist developer attack in the non-imaged areas of the outer layer but rapid enough for the second polymeric binder to be quickly loosened from imaged areas and kept suspended or dissolved for a considerable time.

Multilayer imageable element containing sulfonamido resin

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.

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Aurora, CO, United States of America

Larisa Novoselova