A Lithographic Printing Plate Precursor
AssigneeEco3 BV
InventorsThomas Billiet, Kristof Heylen
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Abstract
A lithographic printing plate precursor is disclosed which includes a support and a coating comprising a photopolymerisable layer including a polymerisable compound, an initiator and a pH sensitive colorant precursor and a protective overcoat layer provided above the photopolymerisable layer including a heat sensitive color-forming IR dye, which upon exposure to heat and/or light forms a print-out image which remains stable or increases during storage of the precursor in light or dark environment.
Claims18
A negative-working lithographic printing plate precursor including a support and a coating comprising a photopolymerisable layer including a polymerisable compound and a photoinitiator, and a protective overcoat layer provided above the photopolymerisable layer:
- characterized in that the photopolymerisable layer includes a pH sensitive colorant precursor capable of forming a CIE 1976 color difference ΔE2 of 12.0 or more than 12.0 upon treatment with a liquid having a pH of about 4 or below 4 and that the protective overcoat layer includes a heat sensitive color-forming IR dye capable of inducing a CIE 1976 color difference ΔE1 of 2.0 or more than 2 upon heating and/or IR radiation.
Dependencies are inferred from the claim text.