摘要:
Disclosed are a lithographic printing plate precursor that can record images by laser beam scanning exposure based on digital signals and can be printed by easy development processing or development processing on a printing machine, comprising a support having thereon an ink-receptive light-heat conversion layer containing a compound converting laser light to heat and a hardened hydrophilic layer in this order, wherein a part of said light-heat conversion layer remains at a laser light-irradiated area of the lithographic printing plate precursor, and a plate-making method of a lithographic printing plate using the same.
摘要:
A hydrophilic layer and an overcoat layer are provided in this order on a heat-sensitive layer having an ink receiving surface, so as to form an original (plate) for a lithographic printing plate. The overcoat layer can be removed during printing. A system capable of forming an inorganic hydrophilic matrix by sol-gel conversion is provided in the hydrophilic layer. Adhesion between the heat-sensitive layer and the hydrophilic layer decreases in a heated region through image processing. Emulsion ink is supplied to the plate surface during printing, whereby the overcoat layer and the hydrophilic layer at an image portion are removed with a hydrophilic component of the emulsion ink. Thus, with a heat-sensitive original that can be subjected to heat-mode prepress using laser exposure, good printed matter can be stably obtained, irrespective of balance between image and non-image portions, without using wetting water.
摘要:
According to a method of preparing a lithographic printing plate comprising processing a lithographic printing plate precursor having a photosensitive layer containing a hexaarylbiimidazole compound and a protective layer with a developer containing a specific organic solvent and at least any of a surfactant and a water-soluble polymer compound, the occurrence of development scum is prevented and both good developing property and printing durability can be achieved. Further, since it becomes possible to conduct one bath processing with a weak alkaline developer, advantages, for example, simplification of processing steps, consideration for global environment and adaptation for space saving and low running cost can be achieved.
摘要:
An image recording material comprises: (A) a polymerization initiator; (B) a polymerizable compound; and (C) a compound of generating, when heated, a chemical species of inhibiting a polymerization reaction.
摘要:
A platemaking method for a lithographic printing plate, comprises: imagewise exposing a lithographic printing plate precursor comprising: a hydrophilic substrate; and a negative image recording layer containing a water-insoluble polymer; and removing a non-exposed area of the image recording layer with an aqueous solution, wherein a temperature of the aqueous solution is higher than a glass transition temperature (Tg) of the water-insoluble polymer.
摘要:
A lithographic printing plate precursor comprising an image recording layer containing a sensitizing dye, a polymerization initiator, a polymerizable compound and a binder polymer and a hydrophilic support, wherein the image recording layer or a layer optionally provided between the image recording layer and the hydrophilic support contains a compound capable of forming an adsorptive group to the hydrophilic support due to heat, an acid or a radical.
摘要:
The present invention provides an exposure processing method of a planographic printing plate comprising: providing an image recording layer containing a polymerizable compound which is solid at the room temperature, a polymerization initiator, and a light-to-heat converting agent, and a microcapsule encapsulating at least one of the monomer and the polymerization initiator, such that the light energy quantity absorbed in the lower part of the image recording layer is more than the light energy quantity absorbed in the upper and middle parts of the image recording layer; exposing the image recording layer, and thereafter post-heating the image recording layer at a temperature in a range equal to or above the melting point of the monomer and below the glass transition point of the wall of the microcapsule. As a result, the printing resistance of a planographic printing plate is enhanced.
摘要:
To provide a developer for processing of a lithographic printing plate precursor, containing a non-reducing sugar having bonded therein two or more monosaccharides and having a pH of 6 to 14 and thereby provide a developer having a pH stable to aging and an excellent film-forming property, a method for manufacturing a lithographic printing plate, where a lithographic printing plate excellent in developability and dispersibility of development scum and kept from staining of the non-image area can be manufactured even by simple processing of one solution and one step requiring no water washing step, a developer used therefor, and a printing method of performing printing by using the manufacturing method of a lithographic printing plate.
摘要:
By a method of preparing a lithographic printing plate having exposing a lithographic printing plate precursor including a photosensitive layer containing (A) a polymerization initiator, (B) a polymerizable compound, (C) a sensitizing dye and (D) a binder polymer and a protective layer in this order on a hydrophilic support with laser and then removing the protective layer and an unexposed area of the photosensitive layer in the presence of a developer, in which the developer is a developer which has pH of from 2 to less than 10 and contains an amphoteric surfactant and a nonionic surfactant having an alkylene oxide chain, a simple processing of one solution and one step which does not require a water washing step becomes possible, excellent development property is achieved and a lithographic printing plate which has good printing durability and does not cause printing stain can be provided.
摘要:
According to a method of preparing a lithographic printing plate substantially comprising a step of imagewise exposing a negative lithographic printing plate precursor having an image-recording layer containing (i) a sensitizing dye, (ii) a photopolymerization initiator, (iii) an addition polymerizable compound having an ethylenically unsaturated double bond and (iv) a binder polymer on a support and a step of processing the exposed lithographic printing plate precursor with an aqueous solution containing a carbonate ion, a hydrogen carbonate ion and a surfactant, the processing property is improved, a printing plate free from the tackiness on the surface thereof can be provided, even when the printing plate is stored after the development until printing, deterioration of the printing durability does not occur, and it becomes possible to conduct one solution development with a weak alkaline processing solution.