Abstract:
Lithographic imaging using non-ablative printing members combines the benefits of simple construction, the ability to utilize traditional metal base supports, and amenability to imaging with low-power lasers that need not impart ablation-inducing energy levels. A representative printing member has a hydrophilic metal substrate and, thereover, first and second layers. The first layer has a thickness and an exposed surface and comprises a material that absorbs imaging radiation. The second layer overlies the first layer and is oleophilic and substantially transparent to imaging radiation. Exposure to imaging radiation causes the first layer and the substrate to irreversibly detach without substantial ablation, thereby facilitating removal, by subjection to the cleaning liquid, of the first and second layers where detachment has taken place.
Abstract:
A heat mode corresponding negative-type image recording material by which ablation in laser scanning when recording is suppressed, the intensity of the formed image portion can be high and a planographic plate excellent in plate life can be formed is provided. It is characterized in that it contains (A) polyurethane resin insoluble in water and soluble in an aqueous alkaline solution or a polymeric compound which has on the side chain thereof a group represented by the general formula (39) or the general formula (40) as a polymeric compound insoluble in water and soluble in an aqueous alkaline solution, (B) a radical-polymerizable compound, (C) a light-to-heat converting agent and (D) a compound generating a radical by heat mode exposure of a light of wavelength which can be absorbed by (C) a light-to-heat converting agent and image recording can be carried out by the heat mode exposure.X-NH-Y- nullnull(39)Z-NH-R- nullnull(40)
Abstract:
A lithographic printing plate comprises on a substrate a thermo-deactivatable photosensitive layer that is photohardenable before exposure to an infrared radiation and can be rendered incapable or having reduced rate of photohardening upon exposure to an infrared radiation. Optionally, an oleophobic top layer may be deposited on the photosensitive layer to form a waterless plate. Such a plate can be imagewise exposed with an infrared laser to thermally deactivate the photosensitive layer in the exposed areas, followed by overall actinic light exposure to harden the infrared laser non-exposed areas. The exposed plate can be developed with a suitable developer to remove the infrared laser exposed areas. A plate with an ink and/or fountain solution soluble or dispersible photosensitive layer of this invention can be developed on a printing press with ink and/or fountain solution during initial press operation.
Abstract:
A method of making a lithographic printing master is disclosed which comprises the steps of providing an imaging material which comprises a lithographic base having a hydrophilic surface and a non-ablative image-recording layer which is removable in a single-fluid ink or can be rendered removable in a single-fluid ink by exposure to heat or light; image-wise exposing the image-recording layer to heat or light; processing the material by supplying to the image-recording layer a single-fluid ink which is an emulsion of an ink phase and a non-aqueous polar phase. The use of single-fluid ink as processing liquid is a simple, convenient method for the on-press processing of the above defined material.
Abstract:
A negative working photosensitive lithographic printing plate is disclosed, which comprises a support having thereon at least one photosensitive layer containing a polymeric binder having repeating units represented by formula (I): 1 wherein R1 represents a hydrogen atom or a methyl group; R2 represents a hydrocarbon group which has an alicyclic structure and has 3 to 30 carbon atoms and a valence of nnull1; A represents an oxygen atom or nullNR3null, wherein 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. The negative working photosensitive lithographic printing plate can attain both high productivity and high printing durability. It is especially suitable for drawing with laser light.
Abstract:
Provided is a heat-sensitive lithographic printing plate comprising a support having thereon an undercoat layer and a heat-sensitive layer in this order, with at least one of the undercoat layer and the heat-sensitive layer comprising polymer hollow microspheres having voids on the inside, or a heat-sensitive lithographic printing plate comprising a support having thereon a heat-sensitive layer, with the heat-sensitive layer comprising polymer hollow microspheres having voids on the inside.
Abstract:
The present invention relates to a heat mode-compatible planographic printing plate comprising a photosensitive layer which is capable of recording with an infrared laser and formed by applying a photosensitive layer coating solution onto a hydrophilic support and then drying the photosensitive layer coating solution, the photosensitive layer coating solution being obtained by dissolving or dispersing I) an IR absorber, II) a polymerization initiator, and III) a compound having a polymerizable unsaturated group in a solvent, wherein the residual solvent in the photosensitive layer is 5% by weight or less relative to the weight of the photosensitive layer.
Abstract:
A heat-sensitive lithographic printing plate precursor is disclosed, which comprises an aluminum support having provided thereon an ink-receptive layer and a hydrophilic layer containing a colloidal particle oxide or hydroxide of at least one element selected from the group consisting of beryllium, magnesium, aluminum, silicon, titanium, boron, germanium, tin, zirconium, iron, vanadium, antimony and transition metals, wherein at least one layer of the ink-receptive layer and the hydrophilic layer contains a compound capable of converting light into heat, the aluminum support has an anodic oxide film in an amount of 2 g/m2 or more, and the anodic oxide film has been subjected to sealing treatment at a sealing rate of 50% or more.
Abstract translation:公开了一种热敏平版印刷版原版,其包括在其上设置有油墨接受层的铝支撑体和含有选自铍,镁,镁,镁,镁等的至少一种元素的胶体粒子氧化物或氢氧化物的亲水层, 铝,硅,钛,硼,锗,锡,锆,铁,钒,锑和过渡金属,其中至少一层油墨接收层和亲水层含有能够将光转化成热的化合物,铝 支撑体具有2g / m 2以上的阳极氧化膜,阳极氧化膜以50%以上的密封率进行密封处理。
Abstract:
A planographic printing plate formed of a support having sequentially disposed thereon a first layer, that is structured by a heat-insulating material having a low thermal conductivity, and that is made hydrophilic by being processed with one of an alkali and a silicate in an alkali developing solution after exposure; and a second layer whose alkali developability is changed, without ablation, by being irradiated with an infrared ray. Alternatively, a support that is structured by a heat-insulating material whose thermal conductivity is low, and in which a surface thereof is made hydrophilic by being processed with one of an alkali and a silicate in an alkali developing solution after exposure, may also be used as the support.
Abstract:
A negative working non-ablative lithographic printing plate precursor is provided which includes a metal support such as an anodized aluminum plate and provided thereon a layer or a stack of layers, wherein at least one layer includes a near infrared light absorbing compound which is the main component of the layer(s). As the amount of other reactive compounds besides the near infrared light absorbing compound is less than 20% by weight, excellent-storage stability is obtained. In a highly preferred embodiment the layer or stack of layers is substantially free from the other reactive compounds. The material is very suitable for computer-to-plate and computer-to-press applications as it can be used as a printing master directly after exposure or may be processed by rinsing with plain water.