Abstract:
A lithographic printing plate precursor is provided that, using laser exposure, exhibits an excellent capacity for plate inspection, an excellent on-press development performance or gum development performance, and an excellent scumming behavior, while maintaining a satisfactory printing durability. There is also provided a method of lithographic printing that uses this lithographic printing plate precursor. The lithographic printing plate precursor comprises an image recording layer having (A) a nonionic polymerization initiator that contains at least two cyclic imide structures, and (B) a compound that has at least one addition-polymerizable ethylenically unsaturated bond.
Abstract:
The present invention provides a negative-working photosensitive material formed by sequentially layering an undercoat layer and a photosensitive layer on a support, wherein the undercoat layer contains a polymer containing (a) a structural unit containing at least one selected from a carboxylic acid or a carboxylic acid salt and (b) a structural unit containing at least one carboxylic acid ester; the photosensitive layer contains (A) an infrared absorbent, (B) an organoboron compound, (C) an onium salt compound and (D) a compound having a polymerizable unsaturated group; and a ratio of (a) with respect to (a) and (b) is 30 to 90% by mol. The invention also provides a negative-working planographic printing plate precursor that uses the negative-working photosensitive material.
Abstract:
A method of processing an on-press developable lithographic printing plate involving the removal of the overcoat after laser imaging and before on-press development is described. The plate comprises a substrate, an on-press ink and/or fountain solution developable photosensitive layer, and an overcoat. The laser imaged plate is mechanically stripped off the overcoat, and then developed with ink and/or fountain solution on a lithographic press. Such a process allows the use of overcoat to achieve faster photospeed and improved durability of the plate without having various issues as related to overcoat such as contamination to the fountain solution, difficulty to remove of certain overcoat, and limited white light stability.
Abstract:
A lithographic printing plate precursor includes an image-recording layer and a protective layer containing a stratiform compound, wherein at least one of the image-recording layer and the protective layer contains a polymer containing as a repeating unit, a structural unit having an ammonium structure.
Abstract:
An image-forming method includes: exposing a negative type image-forming material including a support and an image-recording layer containing a binder polymer containing at least one group capable of being converted to a sulfonate upon a reaction with an aqueous solution containing at least one of a sulfite and a bisulfite, a sensitizing dye, a polymerization initiator, and a compound having an ethylenically unsubstituted bond; and removing an unexposed area of the image-recording layer with an aqueous solution containing at least one of a sulfite and a bisulfite.
Abstract:
A negative-working imageable element has an imageable layer that includes an initiator composition including an iodonium cation and a borate anion, an infrared radiation absorbing compound, a particulate primary polymeric binder, and a phosphate (meth)acrylate adhesion promoter. The element also includes a polymeric overcoat disposed over the imageable layer and can be developed on-press to provide a lithographic printing plate with high run length. The element also has improved shelf-life.
Abstract:
A printing method comprising: imagewise exposing a lithographic printing plate precursor comprising a support and an image recording layer being removable with a fountain solution or a combination of a printing ink and a fountain solution and loading the exposed lithographic printing plate precursor on a plate cylinder of a printing press, or loading the lithographic printing plate precursor on a plate cylinder of a printing press and imagewise exposing the loaded lithographic printing plate precursor, supplying at least a fountain solution comprising a compound represented by the formula (I) defined herein to the exposed lithographic printing plate precursor so as to remove an unexposed area of the image recording layer; and performing printing.
Abstract:
The present invention provides a planographic printing plate precursor having a support, a photosensitive layer and a protective layer. The photosensitive layer contains at least an infrared absorbing agent, a polymerization initiating agent, a polymerizable compound and a binder polymer having repeating units represented by the following Formula (i). Further, the protective layer contains at least an inorganic lamellar compound. In Formula (i), R1 represents a hydrogen atom or a methyl group; R2 represents a connecting group having two or more types of atom selected from the group consisting of a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom, and a sulfur atom and having 2 to 82 atoms in total; A represents an oxygen atom or —NR3—, and R3 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms; and n is an integer of 1 to 5.
Abstract:
A method of making a lithographic printing plate includes the steps of a) providing a lithographic printing plate precursor including (i) a support having a hydrophilic surface or which is provided with a hydrophilic layer, (ii) a coating on the support including a photopolymerizable layer, and, optionally, an intermediate layer between the photopolymerizable layer and the support, b) image-wise exposing the coating in a plate setter, c) optionally, heating the precursor in a preheating unit, and d) developing the precursor off-press in a gumming unit by treating the coating of the precursor with a gum solution, thereby removing the non-exposed areas of the coating from the support, wherein the coating further includes a compound capable of interacting with the support, the compound being present in the photopolymerizable layer and/or in the intermediate 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.