Southern Lithoplate, Inc.

Teresa Baker

James A Bonham

Stephan J W Platzer

Kimberly R Kukla

Ella Ross Ryan

Donald Riley

Richard C Wax

An infrared sensitive, positive-working, image forming composition and element are disclosed. The image forming composition comprises a 1,1-di[(alkylphenoxy)ethoxy]cyclohexane, an infrared absorbing dye having a maximum absorption peak in the range of from about 700 nm to about 1100 nm, and a novolac polymer. The composition is applied and dried on a planar, hydrophilic substrate to form an image forming element, in particular, a planographic printing plate. Upon imagewise exposure to a near-infrared radiation source, the infrared dye absorbs light in the exposed areas and converts it to heat, which causes a disruption in the matrix of the image forming composition. Upon development with an aqueous alkaline developer, the exposed areas are removed while the nonexposed areas remain, thus forming a positive image.

Near-infrared sensitive, positive-working, image forming composition and photographic element containing a 1,1-di[(alkylphenoxy)ethoxy]cyclohexane

The present invention includes a method of preparing an inkjet ink imaged lithographic printing plate by imagewise applying an acidic inkjet ink onto a substrate coated with an inkjet ink reactive coating composition which is acid-catalyzed, to produce an imaged coated substrate wherein the inkjet ink imaged regions are more insoluble than non-imaged regions. Then the imaged and non-imaged regions of the imaged coated substrate are contacted with a developer or fountain solution to selectively remove the coating from the soluble non-imaged regions. The present invention also includes an inkjet ink imaged lithographic printing plate which is prepared by the method of the invention.

Acid inkjet imaging of lithographic printing plates

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Louisberg, NC, United States of America

Teresa Baker