Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a lithographic printing plate, exhibiting safe and excellent developability and processing performance in a one liquid process by a processing liquid in a weak alkali pH range, preferably a processing liquid having a pH of 8.5 to 10.5. SOLUTION: The method for manufacturing a lithographic printing plate includes steps of: preparing a lithographic printing precursor having an image forming layer containing an IR absorbent, a polymerization initiator, an ethylenically unsaturated compound and a binder polymer on a hydrophilic support; imagewisely exposing the lithographic printing plate precursor; and processing the imagewisely exposed lithographic printing plate precursor with a processing liquid containing a carbonate ion, a hydrogen carbonate ion and a water-soluble polymer compound. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a lithographic printing plate precursor that allows writing with an IR laser beam, suppresses polymerization inhibition in a photosensitive layer, has excellent removal property by development, and that suppresses adhesion between the outermost surface in the photosensitive layer side to the support backside of an adjacent lithographic printing plate precursor even when lithographic printing plate precursors are stacked, and suppresses the occurrence of rubbing scratches between the photosensitive surface and the backside of an aluminum support. SOLUTION: The lithographic printing plate precursor has, on one surface of a roughened aluminum support, a photosensitive layer containing (A) an IR absorbent, (B) a borate compound, (C) a radical polymerization initiator, (D) a polymerizable compound having an unsaturated ethylenic double bond, (E) a binder polymer and (F) the photosensitive layer containing polymer fine particles, and has a back coat layer containing an organic polymer compound on the surface of the roughened aluminum support where the photosensitive layer is not formed. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a polymerizable negative planographic plate precursor that is a planographic printing plate precursor writable with an IR laser beam and has a protective layer which suppresses polymerization inhibition in a recording layer, shows excellent development removability, suppresses adhesion to an adjacent planographic printing plate precursor even when precursors are piled, and can be improved in scratching resistance of the protective layer surface, and to provide a pile of the precursors. SOLUTION: The plate precursor comprises a recording layer on a support and a protective layer as the uppermost layer containing silica-coated organic resin fine particles and a hydrophilic polymer. The organic resin fine particles are preferably composed of at least one kind of resin selected from the group consisting of polyacrylic acid resins, polyurethane resins, polystyrene resins, polyester resins, epoxy resins, phenolic resins and melamine resins, and the protective layer preferably contains a mica compound. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an original plate of a lithographic printing plate which is developable on a press after image exposure by infrared laser and excellent in sensitivity, on-press developability, inking properties, stability with time, plate wear resistance and mar resistance and also in the stability of a coating solution. SOLUTION: The original plate of the lithographic printing plate has on a substrate an image recording layer whereon an image can be formed by removing an unexposed portion by supplying an oil-based ink and a water-based component on the printing press after the image-shaped exposure, and a protective layer. The image recording layer and/or the protective layer contains a phosphonium compound and the protective layer contains an inorganic layered compound and an anionic polyvinyl alcohol resin. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a lithographic printing plate precursor that can be developed even in a pH region from acidic to weak alkaline, has excellent scratch resistance and adhesion resistance even when stacked without using slip sheets, and gives no influence on printing performances, and to provide a stacked of the printing precursors and a method for manufacturing a lithographic printing plate. SOLUTION: The method for manufacturing the lithographic printing plate includes steps of: imagewisely exposing a lithographic printing plate precursor having a photosensitive layer and a protective layer in this order on a hydrophilic support body; and removing the protective layer and the photosensitive layer in an unexposed portion with a developing solution having a pH from 2 to 10. The photosensitive layer contains (A) a sensitized dye, (B) a polymerization initiator, (C) a polymerizable compound and (D) a binder polymer. The outermost layer of the protective layer contains a hydrophilic polymer and organic resin particles containing silica. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a planographic printing plate precursor that is writable by laser exposure and can prevent scratches due to contact of precursors with each other when the precursors are stacked without interleaving slip sheets, and to provide a stack of the planographic printing plate precursors in which scratches due to contact of the precursors with each other can be prevented and which can improve productivity in a plate making process. SOLUTION: The planographic printing plate precursor has a photosensitive recording layer on one side of a support and a back coat layer containing an epoxy resin on the other side of the support. The stack thereof is obtained by stacking a plurality of planographic printing plate precursors in such a way that an outermost surface on the photosensitive recording layer side is brought into direct contact with an outermost surface on the back coat layer side. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a lithographic printing plate precursor and its laminate that suppress adhesion and rub scratches between the surface of the lithographic printing plate precursor and the backside of a support in an adjacent lithographic printing plate precursor when the plates are stacked without using inserting paper, that suppress polymerization inhibition in a polymerizable negative photosensitive layer, and that prevent fracture of the photosensitive layer. SOLUTION: The lithographic printing plate precursor has a polymerizable negative photosensitive layer and an oxygen blocking layer containing mica sequentially in this order on a support, and further has a protective layer containing fine particles containing an organic resin as the uppermost layer, wherein the hardness H 1 of the fine particles containing the organic resin and the hardness H 2 of the oxygen blocking layer containing mica satisfy the relation of H 1 ≤H 2 . COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an original plate of a lithographic printing plate which enables image recording by laser and on-press development and of which the stability with time is ensured, and a lithographic printing method using the original plate of the lithographic printing plate. SOLUTION: The original plate of the lithographic printing plate has, on the surface of a substrate, an image recording layer whereon an image can be formed by removing an unexposed portion by supplying an oil-based ink and a water-based component thereto on a printing press, without undergoing any development process after exposure, and an overcoat layer which contains an inorganic layered compound. The overcoat layer contains a specific compound having a phosphoric acid group or a phosphoric monoester group, or a hydrophilic resin having the phosphoric acid group or a phosphonic acid group. The lithographic printing method using the original plate of the lithographic printing plate includes image exposure by the infrared or ultraviolet laser and on-press development. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a high performance printing chemical for protecting a non-image part against contamination, a lithographic printing method using this printing chemical, and an original lithographic printing plate using this lithographic printing method. SOLUTION: This printing chemical contains a water-soluble polymer with an adsorptive group which adsorbs the surface of a lithographic printing plate support and a sulfonic group. The lithographic printing method which prints using this printing chemical, and the original lithographic printing plate used in this method are provided. COPYRIGHT: (C)2007,JPO&INPIT