Kodak Polychrome Graphics, Gmbh

Eastman-kodak Company

Ursula Müller

Hans-Joachim Timpe

Tobias Wittig

Harald Baumann

Udo Dwars

Christopher D Simpson

Negative-working imageable elements can be imaged and processed to provide lithographic printing plates. These imageable elements are sensitive to infrared radiation but are insensitive to 'white' light and thus can be more easily handled under white light conditions. These properties are possible by incorporating a filter dye having a &#x3bb;of from about 300 to about 500 nm into the imageable layer of the imageable elements.

Negative-working imageable elements

The use of certain mercapto compounds as shelf life improvers for infrared-sensitive lithographic printing plate precursors is disclosed. The compounds are five-membered heteroaromatic rings containing a nitrogen atom and at least one other heteroatom, which can be oxygen, sulfur, or another nitrogen atom, such that two ring heteroatoms are bonded to a ring carbon bearing a thiol group.

Stabilized infrared-sensitive polymerizable systems

The present invention relates to IR-sensitive compositions containing an initator system comprising: These compositions are inter alia extraordinarily suitable for the manufacture of printing plates.

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Herzberg am Harz, Germany

Ursula Müller