Abstract:
To provide a method of preparing a lithographic printing plate which is safe, exhibits excellent developing property and processing ability, and enables processing with one solution by processing after image exposure, 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 hydrophilic support with an aqueous solution containing a carbonate ion, a hydrogen carbonate ion and a water-soluble polymer compound.
Abstract:
A lithographic printing plate precursor comprising: a support; an image-recording layer; and a protective layer containing an inorganic stratiform compound, provided in this order, wherein the inorganic stratiform compound contains an organic cation.
Abstract:
A lithographic printing process which comprises the steps of: imagewise scanning with a laser a presensitized lithographic plate which comprises a hydrophilic support and an image-recording layer containing a polymerization initiator, an ethylenically unsaturated polymerizable compound having no adherence to the hydrophilic support, and an ethylenically unsaturated polymerizable compound having adherence to the hydrophilic support and a molecular structure comprising a polyoxyalkylene group to polymerize the ethylenically unsaturated polymerizable compounds within the exposed area; removing the image-recording layer within the unexposed area from the lithographic plate mounted on a cylinder of a printing press; and then printing an image with the lithographic plate mounted on the cylinder of the printing press. A presensitized lithographic plate is also disclosed.
Abstract:
The present invention provides new intermediate compounds enabling the preparation of N-meso substituted cyanine, merocyanine or oxonole dyes wherein the N-meso substituent comprises electron withdrawing groups and wherein such N-meso substituents are introduced at the intermediate level. These intermediates enable the formation of dyes having in the meso-position N-substituents comprising electron withdrawing groups without the need for further derivatization of the meso-substituent at the dye level.
Abstract:
A lithographic printing plate precursor includes, in the following order: a support; an image-recording layer which is capable of being removed with at least one of printing ink and dampening water and contains a polymerizable compound represented by the formula (1) as defined herein, a polymer particle containing a structural unit represented by the formula (2) as defined herein and a structural unit represented by the formula (3) as defined herein, an infrared absorbing agent and a polymerization initiator; and an overcoat layer.
Abstract:
A lithographic printing plate precursor includes a support and an image-recording layer, a non-image area of the image-recording layer is capable of being removed by supplying printing ink and dampening water, and the image-recording layer contains (A) a compound containing two or more isocyanuric acid skeletons each having at least one substituent containing a hydroxy group, (B) an infrared absorbing agent, (C) a radical initiator and (D) a radical polymerizable compound.
Abstract:
To provide a lithographic printing plate precursor capable of obtaining a plenty of sheets of good printed matters with practical energy dosage, which is excellent in on-press developing property and press life, and capable of reducing pollution of fountain solution, and provide a lithographic printing method. The lithographic printing plate precursor comprises a support having provided thereon an image-recording layer, which lithographic printing plate precursor is mounted on a printing press and imagewise exposed, or mounted on the printing press after imagewise exposure, and then developed by feeding printing ink and/or a fountain solution, wherein at least a part of the unexposed part of the image-recording layer is not dissolved in the printing ink, the fountain solution or both of them, and removed by falling out of film, and the invention provides a lithographic printing method using the same.
Abstract:
Negative-working imageable elements that can be imaged using infrared radiation comprise an imageable layer and a protective overcoat on a hydrophilic substrate. The imageable layer includes an IR-sensitive cyanine dye. The protective overcoat predominantly comprises one or more poly(vinyl alcohol) resins, each of which has a hydrolysis level of 85% or less. The use of this particular overcoat composition used in combination with the IR-sensitive cyanine dye provides improved tolerance to fogging by white light while maintaining desired imaging speed.
Abstract:
The present invention provides a polymerizable composition comprising (A) a compound represented by the following formula (I), (B) an infrared absorbent, and (C) a compound having at least one addition-polymerizable ethylenically unsaturated bond, and a negative planographic printing plate precursor having a recording layer containing the polymerizable composition. In the formula (I), R1, R2, R3, R4, R5, and R6 each independently represent a hydrogen atom or a monovalent organic group; and X− represents an anion.
Abstract:
A method of making a lithographic printing plate comprising the steps of: a) providing a lithographic printing plate precursor comprising (i) a support having a hydrophilic surface or which is provided with a hydrophilic layer, (ii) a photopolymerizable coating on said support, b) image-wise exposing said coating in a plate setter, c) developing the precursor, thereby removing the non-exposed areas of the coating from the support, whereby the developing step is carried out off-press in a gumming unit by treating the coating of the precursor with a gum solution.