Abstract:
An infrared-sensitive image forming material with which a plate can be directly formed by an infrared laser. The infrared-sensitive image forming material has a support having disposed thereon a recording layer whose solubility in an aqueous alkaline solution is altered by irradiation with an infrared laser. The recording layer has a binder phase formed of a polymer compound, a dispersion phase that is dispersed in the binder phase, and an infrared absorbent present in either one of the binder phase and the dispersion phase. Within a total incorporated amount of the infrared absorbent in the recording layer, a mass present in the dispersion binder is greater than a mass present in the binder phase. Namely, within the recording layer, the infrared absorbent is localized in the dispersion phase.
Abstract:
The present invention relates to a negative-working radiation imageable lithographic printing plate precursor, preferably having only two polymeric layers on a support. The first (bottom) layer is composed of oleophilic polymers and a photothermal converter which converts radiation to heat. The second polymeric layer (top) is composed of crosslinked hydrophilic polymers which absorb aqueous fountain solution and repel ink. The oleophilic polymers in the first layer contain functional groups are interlayer chemically bonded to the hydrophilic polymer in the second layer to provide interlayer adhesive bonding between the two layers. The plate is imagewise exposed to radiation, such as with an IR laser, resulting in non-ablative adhesion-weakening between the two layers so that the plate can be developed by fountain solution and/or ink on press whereby the top layer in the exposed area is removed on the press to reveal the ink-receptive image area. The top layer in the unexposed area remains as the non-image area.
Abstract:
The present invention provides an image recording material onto which images can be recorded with an infrared ray, the material comprising an infrared absorbent (A), a radical-generating agent (B) and a radically polymerizable compound (C), wherein the infrared absorbent is a cyanine dye in which at least one substituent on a nitrogen atom in a heterocyclic ring at each end forms a cyclic ring which includes a methine chain.
Abstract:
There is provided a negative planographic printing plate which can be directly recorded based on digital data from computers and the like, excellent in storage stability, shows no reduction in sensitivity with the lapse of time, and has excellent face flatness. It comprises a substrate having disposed thereon a photosensitive layer which is obtained by applying a photosensitive layer application solution containing an infrared absorber, a compound which generates a radical or acid due to heat, a polymerizable compound or a crosslinking compound, and a silicon-based surfactant such as a siloxane/oxyethylene copolymer and the like, onto the substrate and drying the solution, and which is hardened by exposure to an infrared laser ray.
Abstract:
An infrared sensitive composition and a lithographic printing plate precursor having a large difference in alkali solubility between the exposed portions and unexposed portions (dissolution discrimination), an excellent latitude in development, and a high sensitivity can be provided when the composition is used for the image-forming layer of a lithographic printing plate precursor, which is an infrared sensitive composition comprising an alkali-soluble resin having a phenolic hydroxyl group (A), a light-heat converting substance (B) and a leucohydroxy dye (C).
Abstract:
A method of making a printing plate from a heat-sensitive PS plate of a positive-working mode for lithographic printing includes the steps of exposing the heat-sensitive PS plate to light and developing the PS plate using an alkaline developing solution containing at least one surfactant selected from the group consisting of anionic surfactants and ampholytic surfactants, and a salt selected from the group consisting of alkali metal salts and ammonium cation salts. The PS plate has a substrate and an image forming layer formed thereon, the image forming layer including a lower layer which is formed on the substrate and contains a water-insoluble and alkali-soluble resin and an upper heat-sensitive layer which is overlaid on the lower layer and contains a water-insoluble and alkali-soluble resin and an infrared absorption dye and exhibits an elevated solubility with respect to alkaline aqueous solutions when heated.
Abstract:
Disclosed is a planographic printing plate precursor, comprising a hydrophilic support and an image forming layer containing oleophilic heat-fusible particles, wherein the hydrophilic support has voids and the void content is 20 to 40 ml/m2.
Abstract translation:公开了一种平版印刷版前体,其包含亲水性支持体和含有亲油性热熔性颗粒的图像形成层,其中亲水性载体具有空隙,空隙含量为20〜40ml / m 2。
Abstract:
A lithographic printing plate precursor which comprises a support having provided thereon a layer comprising a hydrophilic medium, wherein the layer comprising a hydrophilic medium contains a hydrophobitization precursor having a hydrophilic surface and a light/heat converting agent which is hydrophilic in itself, or at least on the surface.
Abstract:
An image forming method using a negative type image forming material is disclosed, and said method comprises the steps of exposing a negative type image forming material to infrared laser imagewise, which image forming material comprises a substrate and an image recording layer formed thereon, comprising (A) a radical generator, (B) a radical-polymerizable compound, (C) an infrared absorbing agent, and (D) a binder polymer; and developing the image forming material with an alkaline developing solution comprising a weak acid or a salt thereof having a dissociation constant pka of from 10 to 13.
Abstract:
The invention provides a hydrophilic member precursor having a hydrophilic surface that is formed by contacting a hydrophobic polymer-containing layer formed on a substrate with a composition that contains a polymerizing group-having hydrophilic polymer followed by applying energy thereto to thereby directly chemically bond the polymerizing group-having hydrophilic polymer to the hydrophobic polymer-containing layer. The invention also provides a hydrophilic member from the hydrophilic member precursor, as well as a pattern forming material, a support for planographic printing plates, and a planographic printing plate precursor.