Eastman-kodak Company

Philipp Viehmann

Christopher D Simpson

Saija Werner

Oliver Richard Blum

Stefanie Hansmann

Oliver Merka

Jan-Phillip Kemmling

Benedikt Uhl

IR-sensitive lithographic printing plate precursors provide a stable print-out image using a unique IR radiation-sensitive composition. This IR radiation-sensitive composition includes: a) free radically polymerizable component; an b) IR radiation absorber; c) an initiator composition; a d) borate compound; and a e) compound capable of forming a colored boronic complex during or after exposure of the infrared radiation-sensitive image-recording layer to infrared radiation. The resulting print-out image exhibits an excellent color contrast between the exposed and non-exposed regions. After IR imaging, these precursors can be developed off-press or on-press.

Lithographic printing plate precursor and method of use

On-press developable, negative-working lithographic printing plate precursors are used to provide lithographic printing plates. Such precursors are prepared with a substrate and one or more negative-working, infrared radiation-sensitive imagable layers. The substrate is prepared by two separate anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (T) of 650-3,000 nm and inner micropores having an average inner micropore diameter (D) of &#x3c;15 nm. A formed outer aluminum oxide layer comprises outer micropores having an average outer micropore diameter (D) of 15-30 nm; an average dry thickness (T) of 130-650 nm; and a micropore density (C) of 500-3,000 micropores/&#x3bc;m. The ratio of Dto Dis greater than 1.1:1, and Din nanometers and the outer aluminum oxide layer micropore density (C) in micropores/&#x3bc;m, are further defined by the outer aluminum oxide layer porosity (P) as:0.3&#x2264;&#x2264;0.8wherein Pis 3.14(C)(D)/4,000,000.

Method for making lithographic printing plates

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Gottingen, Germany

Philipp Viehmann