Abstract:
A negative lithographic printing plate precursor includes a support; and a photo-polymerization layer containing a polymer compound having at least one of a sulfonamido group and a cyclic structure derived from maleimide, and further having a hydrophilic group in a molecule thereof
Abstract:
A method for forming a colored image with good visibility on a lithographic printing plate precursor by exposure to a laser light, particularly, a method for forming a colored image with good visibility on a lithographic printing plate precursor which is developable on a printing press, the method for forming a colored image comprising: exposing a lithographic printing plate precursor to a laser light; and heating or exposing the entire lithographic printing plate to form a colored image, wherein the lithographic printing precursor comprises a support and a photosensitive-thermosensitive layer capable of recording an image by exposure to an infrared laser, the photosensitive-thermosensitive layer containing an infrared absorbent and a discoloring material that undergoes color change upon exposure.
Abstract:
The invention is to provide a planographic printing plate material providing excellent developability and printing durability and a planographic printing process employing the same, and particularly to provide a planographic printing plate material, which is capable of carrying out on-press development and provides excellent on-press development property and printing durability and a planographic printing process employing the same. The planographic printing plate material comprises a plastic support and provided thereon, a hydrophilic layer and an image formation layer, wherein the hydrophilic layer is a layer formed from an emulsion containing polymer particles with silica.
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 positive planographic printing plate precursor includes a support having disposed thereon a lower thermosensitive layer containing a water-insoluble but alkali-soluble polymer compound and an upper thermosensitive layer containing a water-insoluble but alkali-soluble polymer compound, with alkali-solubility increasing under heat, wherein (i) both the upper thermosensitive layer and the lower thermosensitive layer contain an IR absorbing dye, with the ratio of the IR absorbing dye concentration in the upper thermosensitive layer to the IR absorbing dye concentration in the lower thermosensitive layer is 1.6 to 10.0, and/or (ii) the upper thermosensitive layer and the lower thermosensitive layer contain different IR absorbing dyes, and/or (iii) at least one of the upper thermosensitive layer and the lower thermosensitive layer contains an IR absorbent having, in one molecule, at least two chromophoric groups that absorb IR light, with the chromophoric groups bonding to each other via a covalent bond.
Abstract:
An image recording material of the present invention comprises an anodized aluminum support, an intermediate layer containing a polymer having a carboxylic acid group in a side chain thereof and formed on the aluminum support, and a photosensitive layer containing at least 50% by weight or more of novolak type phenol resin and a photothermal conversion agent and recordable by IR laser beam. A planographic printing plate excellent in printing durability can be obtained by subjecting the image recording material imagewise to IR laser exposure treatment and to development treatment, and then heating the image recording material at 150 to 300° C.
Abstract:
Thermally imageable multilayer imageable elements useful as lithographic printing plate precursors that have good solvent resistance are disclosed. The underlayer of the imageable element comprises an acidic copolymer that comprises, in polymerized form, about 10 mol % to about 75 mol % of one or more monomers of the formula: CH2═CH(R1)-Z-X—NH—CO—NH—C6H3—(R2)(CO2H); in which: R1 is H or CH3; R2 is H or OH; Z is —C6H4— or —C(O) —Y—; Y is —O— or —NH—; and X is selected from —C(CH3)2—, —CH(CH3)— and —(CH2)n—, in which n is an integer from 1 to 12.
Abstract:
Disclosed is a presensitized plate composed of a support having thereon an image recording layer which includes: an infrared absorber (A) that is a cyanine dye having at least one fused ring composed of a nitrogen-containing heterocycle in combination with an aromatic ring or a second heterocycle, and having on the aromatic ring or second heterocycle an electron-withdrawing group or a heavy atom-containing group, a radical generator (B), and a radical-polymerizable compound (C), and which is removable with printing ink and/or dampening water. The presensitized of the present invention can be imaged with an infrared light-emitting laser to directly record an image from digital data on a computer or the like and is then subjected to on-machine development without carrying out a development step, which is capable of providing a large number of good impressions with a practical amount of energy.
Abstract:
Disclosed is a planographic printing plate material comprising a support and provided thereon, a hydrophilic layer containing a light-to-heat conversion material and a thermosensitive image formation layer in that order, wherein the thermosensitive image formation layer contains a latex containing a hydrophobic component and a hydrophilic component as a protective colloid.
Abstract:
A photosensitive composition comprising: (A) a polymerizable compound represented by the following formula (I): A—{O—[(CH(—R1)CH(—R2))m—O]n—C(═O)—C(—R3)═CH2}p (I) wherein R1, R2and R3 each represents a hydrogen atom or a methyl group, A represents a polyhydric alcohol residue or a polyhydric phenol residue, m represents an integer of from 1 to 6, n represents an integer of from 1 to 20, and p represents an integer of from 1 to 6; (B) an infrared absorber; and (C) an onium salt.