Photosensitive lithographic printing plate and method for making a printing plate
AssigneeLastra S.p.A.
InventorsToshiyuki Urano, Kazuhiro Kohori, Hideaki Okamoto
Life of this patent
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Abstract
A photosensitive lithographic printing plate includes a photosensitive layer and a protective layer formed in this order on a support, wherein the photosensitive layer has a maximum peak of spectral sensitivity within a wavelength range ranging from 390 to 430 nm, the minimum exposure for the photosensitive lithographic printing plate for image formation at a wavelength of 410 nm (S410) is at most 100 μJ/cm2, and the relation between the minimum exposure for image formation at a wavelength of 450 nm (S450) and the minimum exposure for image formation at a wavelength of 410 nm (S410) is 0<S410/S450≦0.1.
Claims26
A photosensitive lithographic printing plate precursor comprising:
- a support;
- and
- a photosensitive layer;
- wherein
- said photosensitive layer contains (A) an ethylenic monomer, (B) a sensitizing agent, and (C) a radical generator;
- and
- said sensitizing agent is a dialkylaminobenzene compound including an aromatic heterocyclic group as a substituent on the carbon atom at the p-position relative to the amino group on the benzene ring.
Dependencies are inferred from the claim text.