Eastman-kodak Company

Oliver Piestert

Harald Baumann

Jianbing Huang

Celin M Savariar-Hauck

Udo Dwars

Gerhard Hauck

Ulrich Fiebag

Christopher D Simpson

Bernd Strehmel

Philip John Watkiss

Michael Flugel

Dietmar Frank

Saija Werner

Uwe Tondock

Andrea Pauls

Lithographic printing plates are formed by imagewise exposing a single-layer or dual-layer positive-working lithographic printing plate precursor. The precursor has an outermost ink receptive layer containing a phenolic resin. The exposed precursor can be processed using a silicate-free developer composition having a pH of at least 12.5. This composition also includes an alkali metal hydroxide; a coating protecting agent that is a quaternary ammonium salt or phosphonium salt, or a mixture thereof, and a moderator for the coating protecting agent that is represented by the following general formula (I): wherein m is at an integer of at least 1 and up to and including 10 and M represents one or more counterions sufficient to balance the negatively-charged sulfonate groups.

Lithographic developer composition and method of use

Lithographic printing plates are provided by imagewise exposing negative-working lithographic printing plate precursors having a negative-working radiation-sensitive imageable layer, followed by contacting with a processing solution that has a pH of at least 7 and up to and including 11. This processing solution also includes component (1) that is a nitrogen-containing base having an atmospheric pressure melting point of at least 40&#xb0; C.; component (2) that is a non-ionic surfactant that independently has an atmospheric pressure melting point, glass transition temperature, or pour point of at least 40&#xb0; C.; component (3) that is a hydroxy-containing solution promoter; and component (4) that is a hydrophilic surface protective compound. The method is carried out in a manner such that the exposed and processed precursor is not further treated with any liquid (such as gumming or rinsing solution) between processing and mounting onto a printing press.

Method for making lithographic printing plates

Method for producing an imaged lithographic printing plate comprising the step of developing an imagewise exposed negative working precursor with a developer comprising an alkylene oxide derivative of formula (A), wherein Ris a linear or branched Cto Calkyl group or H, (n+m) is an integer from 2 to 30, and RRRand Rare each independently selected from H, methyl and ethyl, with the proviso that at least one of Rand Ris not H, and with the further proviso that at least one of Rand Ris not H. 

Method for making lithographic plates

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Schwetzingen, Germany

Oliver Piestert