Abstract:
A lithographic printing plate precursor includes an aluminum support subjected to a surface roughening treatment, and an image-recording layer, the image-recording layer contains an infrared absorbing agent, a radical polymerization initiator, a radical polymerizable compound and an inorganic particle which has, on a surface of the inorganic particle, an acrylic polymer as a graft chain and an unexposed area of the image-recording layer is capable of being removed with at least one of oily ink and dampening water.
Abstract:
(1) A packaged body of lithographic printing plate precursors, wherein an image-recording layer or a protective layer of the outermost surface layer contains an inorganic layered compound. (2) A lithographic printing plate precursor having a protective layer containing an inorganic layered compound, and an image-recording layer containing a binder polymer. (3) A lithographic printing plate precursor having a protective layer containing an inorganic layered compound, and an image-recording layer containing an infrared absorber and an iodonium compound.
Abstract:
A lithographic printing plate precursor comprising a support and an image-recording layer containing at least one infrared absorbing agent of a cyanine dye in which a HOMO energy level of each of substituents present on both terminal nitrogen atoms is −10.0 eV or higher.
Abstract:
A lithographic printing plate precursor includes: a support; and a photosensitive layer containing (A) an initiator compound, (B) a polymerizable compound and (C) a binder, wherein the photosensitive layer or other layer in contact with the support contains as (D) a component different from the component (C), a copolymer containing (a1) a repeating unit having at least one ethylenically unsaturated bond introduced through an ion pair and (a2) a repeating unit having at least one functional group capable of interacting with a surface of the support.
Abstract:
A lithographic printing plate precursor includes an aluminum support subjected to a roughening treatment and an image-recording layer containing an infrared absorbing agent, a radical polymerization initiator, a radical polymerizable monomer, a compound having two or more mercapto group-containing groups per molecule and a polymer particle containing a polyalkylene oxide segment.
Abstract:
A method of deactivating and on-press developing an exposed lithographic printing plate is disclosed. The plate comprises on a substrate a photosensitive layer developable with ink and/or fountain solution and capable of hardening upon exposure to a radiation. The plate is exposed with the radiation, deactivated, and then on-press developed with ink and/or fountain solution. The deactivation of the exposed plate allows the handling of the plate under regular office light or any other light without causing the hardening of the non-exposed areas of the photosensitive layer.
Abstract:
A lithographic printing plate precursor having a good press life with a practical energy amount, which can be on-press developed without passing through a development processing step after recording an image by a laser of emitting an infrared ray, is provided, which is a lithographic printing plate precursor capable of performing a development and printing by loading on a printing press after imagewise exposure and supplying an oily ink and an aqueous component, the lithographic printing plate precursor comprising a support and an image recording layer, wherein the image recording layer comprises (A) a polymerization initiator, (B) a polymerizable monomer, (C) a binder polymer, and (D) a crosslinked resin particle having a reactive group or (F) a microcapsule containing a polymerizable monomer in the capsule wall, and the image recording layer is imagewise polymerization-curable upon irradiation of actinic ray.
Abstract:
A thermal lithographic printing plate overcoat composition comprising (a) a water-soluble polymeric dye having an absorption band between about 300 and about 600 nm; and (b) micro-particles or nano-particles is provided. A negative-working thermal lithographic printing plate comprising (a) a hydrophilic substrate; (b) a near infrared imaging layer disposed on the hydrophilic substrate; and (c) an overcoat layer disposed on the imaging layer, said overcoat layer comprising a water-soluble polymeric dye having an absorption band between about 300 and about 600 nm; and micro-particles or nano-particles is also provided. Finally, a water-soluble polymeric dye having an absorption band between about 300 and about 600 nm is provided.
Abstract:
A lithographic printing plate precursor includes an image-recording layer and a support, and the image-recording layer contains: (A) at least one compound selected from compounds represented by the following formulae (1) and (2); and (B) an infrared absorbing agent: wherein R1 and R2 each represents Ra—SO3—, Ra—CO2— or Ra—OCO2—, Ra represents a monovalent organic group, R3 to R12 each represents a hydrogen atom or a monovalent substituent, or adjacent two of R3 to R12 may be combined with each other to form a ring, X1, Y1 and Z1 and X2, Y2 and Z2 each represents an atomic group necessary to form a thiazole ring, an oxazole ring, an imidazole ring, a triazole ring or a 3H-indole ring, provided that one nitrogen atom of the imidazole ring is connected to a hydrogen atom or a monovalent organic group.
Abstract:
A method for preparing a lithographic printing plate includes treating a lithographic printing plate precursor including a hydrophilic support and an image-forming layer containing the following (i) to (iii) with an aqueous solution having a buffering ability: (i) a binder polymer comprising a repeating unit having a structure represented by the following formula (1); (ii) an ethylenically unsaturated compound; and (iii) a polymerization initiator, P-L-(CO2H)n (1) wherein P represents a part constituting a main chain skeleton of the polymer, L represents an (n+1) valent connecting group, and n represents an integer of 1 or more.