摘要:
High speed violet or ultraviolet laser sensitive lithographic printing plate comprising on a substrate a specific photosensitive composition is described. The photosensitive layer comprises a multifunctional (meth)acrylate monomer, a hexaarylbiimidazole compound, and a sensitizing dye. Combination of both multifunctional urethane (meth)acrylate monomer and multifunctional non-urethane (meth)acrylate monomer can be advantageously used. The plate is imagewise exposed with a violet or ultraviolet laser at a dosage of less than 1000 μJ/cm2, and then developed either off press or on press.
摘要翻译:描述了在基板上包含特定光敏组合物的高速紫色或紫外线激光平版印刷版。 感光层包含多官能(甲基)丙烯酸酯单体,六芳基联咪唑化合物和增感染料。 可以有利地使用多官能氨基甲酸酯(甲基)丙烯酸酯单体和多官能非氨基甲酸酯(甲基)丙烯酸酯单体的组合。 用紫外线或紫外线激光以小于1000μJ/ cm 2的剂量将板成像曝光,然后按压或按压显影。
摘要:
A method of processing an on-press developable lithographic printing plate involves the removal of overcoat by brushing or rubbing while in contact with water or an aqueous solution after imagewise exposure and before on-press development. The plate comprises a substrate, an on-press ink and/or fountain solution developable photosensitive layer, and a water soluble or dispersible overcoat. Preferably, the overcoat is incapable of being completely removed with ink and/or fountain solution on a lithographic press during roll up. Such a method allows the use of more durable overcoat for on-press developable plate.
摘要:
A method of processing an on-press developable lithographic printing plate involving the removal of overcoat after imagewise exposure and before on-press development is described. The plate comprises a substrate, an on-press ink and/or fountain solution developable photosensitive layer, and an overcoat. The laser imaged plate is stripped off the overcoat, and then under a white room light mounted on press and developed with ink and/or fountain solution. Here the plate is capable of hardening upon exposure to a laser, has limited white light stability before the removal of the overcoat, and has significantly improved white light stability after the removal of the overcoat.
摘要:
High speed violet or ultraviolet laser sensitive lithographic printing plate comprising on a hydrophilic substrate a specific photosensitive composition is described. The photosensitive layer comprises an alkaline soluble polymeric binder, a multifunctional (meth)acrylate monomer, a free-radical initiator, and a sensitizing dye. The plate is imagewise exposed with a violet or ultraviolet laser at a dosage of less than 300 μJ/cm2, and then developed with an aqueous alkaline developer. Higher monomer to polymer weight ratio is advantageously used. A pigment is preferably incorporated into the photosensitive coating solution as a liquid dispersion. The exposed plate is preferably developed on a processor with an alkaline developer coupled with a replenisher having higher pH.
摘要翻译:描述了在亲水基底上包含特定光敏组合物的高速紫色或紫外线激光平版印刷版。 感光层包含碱溶性聚合物粘合剂,多官能(甲基)丙烯酸酯单体,自由基引发剂和增感染料。 用紫外线或紫外线激光以小于300μJ/ cm 2的剂量对板进行成像曝光,然后用碱性显影剂水溶液显影。 有利地使用更高的单体与聚合物的重量比。 优选将颜料作为液体分散体引入感光性涂布液中。 曝光的板优选在具有与具有较高pH的补充剂偶联的碱性显影剂的处理器上显影。
摘要:
A method of on-press developing a laser sensitive lithographic printing plate with ink and/or fountain solution is described. The printing member comprises on a substrate a photosensitive layer soluble or dispersible in ink and/or fountain solution and capable of hardening upon exposure to a laser. The plate is exposed with a laser and on-press developed with ink and/or fountain solution. The exposure and development are performed with the plate under lightings that contain no or substantially no radiation below a wavelength selected from 400 to 650 nm, or in the dark or substantially dark.
摘要:
A method of developing a laser sensitive lithographic printing plate is described. The plate comprises on a substrate a photosensitive layer soluble or dispersible in ink and/or fountain solution and capable of hardening upon exposure to a laser. The plate is exposed with a laser and deactivated under a safe light or in the dark, and then on-press developed with ink and/or fountain solution preferably under white light. Alternatively, the plate is developed off press with ink and/or fountain solution, or with an organic solvent-based or oil-based liquid or paste and/or an aqueous solution, and then mounted on press for lithographic printing.
摘要:
High speed violet or ultraviolet laser sensitive lithographic printing plate comprising on a substrate a specific photosensitive composition is described. The photosensitive layer comprises a multifunctional (meth)acrylate monomer, a hexaarylbiimidazole compound, and a sensitizing dye. Combination of both multifunctional urethane (meth)acrylate monomer and multifunctional non-urethane (meth)acrylate monomer can be advantageously used. The plate is imagewise exposed with a violet or ultraviolet laser at a dosage of less than 1000 μJ/cm2, and then developed either off press or on press.
摘要翻译:描述了在基板上包含特定光敏组合物的高速紫色或紫外线激光平版印刷版。 感光层包含多官能(甲基)丙烯酸酯单体,六芳基联咪唑化合物和增感染料。 可以有利地使用多官能氨基甲酸酯(甲基)丙烯酸酯单体和多官能非氨基甲酸酯(甲基)丙烯酸酯单体的组合。 用小于1000μJ/ cm 2的剂量的紫外线或紫外线激光将该平板成像曝光,然后按压或按压显影。
摘要:
New photoresists are provided that are suitable for short wavelength imaging, including sub-300 nm and sub-200 nm such as 193 nm and 157 nm. Photoresists of the invention contain a resin with photoacid-labile groups, one or more photoacid generator compounds, and an adhesion-promoting additive compound. Photoresists of the invention can exhibit significant adhesion to SiON and other inorganic surface layers.
摘要:
Negative thermosensitive lithographic printing plates comprise on a hydrophilic substrate an oleophilic thermosensitive layer comprising a polymeric binder, urethane (meth)acrylate monomer having at least 6 (meth)acrylate groups, a non-urethane (meth)acrylate monomer having at least 4 (meth)acrylate groups, a free-radical initiator, and an infrared absorbing dye; wherein the weight ratio of said urethane (meth)acrylate monomer to said non-urethane (meth)acrylate monomer is from 0.10 to 3.0, and said thermosensitive layer is capable of hardening upon exposure to an infrared radiation. Lithographic plates with such compositions have excellent press durability.
摘要:
Lithographic printing plates having on a hydrophilic substrate an oleophilic photosensitive layer comprising an oleophilic polymer, a free radical polymerizable monomer, and 4-piperonyl-2,6-bis(trichloromethyl)-s-triazine as free radical initiator and/or leucomalachite green as exposure indicating dye; wherein the weight ratio of the monomer to the polymer is larger than 1.0. The plates can be developed with ink and/or fountain solution on a lithographic printing press or with a non-alkaline aqueous developer comprising 60-99% by weight of water and 0.5 to 40% by weight of an alcohol solvent. A photosensitive dye can be added in the photosensitive layer to provide photosensitivity to a specific wavelength between 200 and 1200 nm. Unlike commonly used s-triazine initiator or leuco dye, 4-piperonyl-2,6-bis(trichloromethyl)-s-triazine or leucomalachite green does not insolubilize from the photosensitive layer.