Abstract:
A waterless or driographic printing plate which can be thermally imaged by an infrared laser is composed of a substrate; a thermal imaging layer containing a photothermal conversion material, such as an infrared absorbing material, and a thermoplastic polyurethane with pendent allyl groups; and a cross-linked silicone polymer top layer. It was discovered that when the imaging layer contains an allyl functional polyurethane mixed with an infrared absorbing dye or pigment, the polymeric layer will have enhanced solubility in certain solvents when exposed to infrared radiation. In addition, the polymeric layer continues to exhibit excellent adhesion to the silicone in unexposed areas so that the infrared absorbing layer can endure development with a suitable organic solvent, or a solvent mixture. Mild brushing or rubbing with the developing solvent readily removes laser-struck portions of the infrared imaging layer while unexposed areas remain firmly intact.
Abstract:
A negative-working imageable element has an imageable layer and a topcoat layer that contains a composition that will change color upon exposure to imaging infrared radiation. The imageable element can be imaged and developed on-press to provide images with improved contrast for print-out.
Abstract:
It is an object of the present invention to provide a method for producing a lithographic printing plate without any deterioration in plate making performance caused by deformation and breakage of fine particles. An inorganic compound dispersion as a coating liquid is applied onto a surface of a strip-shaped flexible support at a pressure P applied to the coating liquid of 1.5 x 105 Pa or less to form a coating layer. Also, an inorganic compound dispersion as a coating liquid is applied onto a surface of a strip-shaped flexible support at a shearing stress τ applied to the coating liquid of 1.5 x 105 Pa or less to form a coating layer.
Abstract:
A method of deactivating and on-press developing an exposed lithographic printing plate is disclosed. The plate comprises on a substrate a photosensitive layer developable with ink and/or fountain solution and capable of hardening upon exposure to a radiation. The plate is exposed with the radiation, deactivated, and then on-press developed with ink and/or fountain solution. The deactivation of the exposed plate allows the handling of the plate under regular office light or any other light without causing the hardening of the non-exposed areas of the photosensitive layer.
Abstract in simplified Chinese:本发明之课题为提供具有优异之印刷品质,于环境面优异之水性平版印刷方法。本发明系一种印刷物之制造方法,其包含下述步骤:使水性印墨附着在于表面存在有印墨排斥层及感热层的平版印刷版的感光层表面上之步骤;与将附着之水性印墨直接、或透过橡皮布(blanket)而转印在被印刷体之步骤。
Abstract:
To provide a lithographic printing plate precursor which is capable of undergoing image recording with laser light and on-press development or development with an aqueous solution having pH of 11 or less, is excellent in developing property after the passage of time, and exhibits high printing durability and good stain resistance after the passage of time, the invention is directed to a lithographic printing plate precursor comprising a support and an image-recording layer containing (A) a polymerization initiator, (B) a sensitizing dye and (C) a polymerizable compound, wherein the image-recording layer or an undercoat layer which is optionally provided between the support and the image-recording layer contains (D) a polymer compound containing (a1) a repeating unit having a side chain having a zwitter ion structure, (a2) a repeating unit having a side chain having a polyoxyalkylene structure and (a3) a repeating unit having a side chain having a structure capable of interacting with a surface of the support.