Method for making lithographic plates
AssigneeEastman Kodak Company
InventorsOliver Piestert, Harald Baumann, Ulrich Fiebag, Bernd Strehmel, Uwe Tondock, Philip Watkiss
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Abstract
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 R1 is a linear or branched C1 to C6 alkyl group or H, (n+m) is an integer from 2 to 30, and R2 R3 R4 and R5 are each independently selected from H, methyl and ethyl, with the proviso that at least one of R2 and R3 is not H, and with the further proviso that at least one of R4 and R5 is not H.
Claims12
Method of producing an imaged lithographic printing plate comprising:
- (a) providing a negative working radiation sensitive lithographic plate precursor for wet offset printing comprising on a substrate at least one photosensitive layer based on radical photopolymerization and optionally an oxygen-impermeable overcoat,
- (b) imagewise exposing the precursor with radiation having a wavelengths from 250 to 1200 nm
- (c) developing the exposed precursor with an aqueous silicate-free alkaline developer comprising:
- (i) at least one alkylene oxide derivate of formula (A)
- wherein R1 is a linear or branched C1 to C6 alkyl group or H, (n+m) is an integer from 2 to 30, and R2, R3, R4 and R5 are each independently selected from H, methyl and ethyl, with the proviso that at least one of R2 and R3 is not H, and with the further proviso that at least one of R4 and R5 is not H;
- (ii) at least one component selected from alkaline components and surfactants and
- (iii) optionally at least one of complexing agents, buffers, defoamers, organic solvents, dyes, odorants, biocides, anticorrosive agents, dispersing agents and thickeners.
Dependencies are inferred from the claim text.