Lithographic printing plate precursor
AssigneeAgfa NV
InventorsThomas Billiet, Kristof Heylen
Life of this patent
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Abstract
A lithographic printing plate precursor is disclosed including a support and a coating comprising (i) a photopolymerisable layer including a polymerisable compound and an optionally substituted trihaloalkyl sulfone photoinitiator, and (ii) a toplayer provided above the photopolymerisable layer; characterized in that the toplayer includes an infrared absorbing dye capable of forming a print-out image upon exposure to heat and/or IR radiation.
Claims16
1-15. (canceled)
A lithographic printing plate precursor comprising a support and a coating comprising (i) a photopolymerisable layer comprising a polymerisable compound and an optionally substituted trihaloalkyl sulfone photoinitiator, and (ii) a toplayer above the photopolymerisable layer;
- wherein the toplayer comprises an infrared absorbing compound capable of forming a print-out image upon exposure to heat and/or IR radiation.
A method for making a printing plate precursor comprising the steps of:
- coating a support with:
- (i) a photopolymerisable layer comprising a polymerisable compound and an optionally substituted trihaloalkyl sulfone photoinitiator, and
- (ii) a toplayer provided above the photopolymerisable layer including an infrared absorbing dye which has a main absorption in the infrared wavelength range of the electromagnetic spectrum before exposure to heat and/or IR radiation, and the infrared absorbing dye absorbs more light in the visible wavelength range of the electromagnetic spectrum after exposure to heat and/or IR radiation, and
- drying the precursor.
A method for making a printing plate including the steps of:
- image-wise exposing a lithographic printing plate precursor to heat and/or IR radiation to form a lithographic image comprising image areas and non-image areas and to induce a colour change in the image areas;
- and
- developing the exposed precursor,
- wherein the lithographic printing plate precursor comprises a support and a coating comprising (i) a photopolymerisable layer comprising a polymerisable compound and an optionally substituted trihaloalkyl sulfone photoinitiator, and (ii) a toplayer above the photopolymerisable layer, and wherein the toplayer comprises an infrared absorbing compound capable of forming a print-out image upon exposure to heat and/or IR radiation.
Dependencies are inferred from the claim text.