Abstract:
A method of producing a printing plate comprises: (a) providing a printing plate precursor (101) comprising a topmost etchable first layer (106) and a second layer (102) located below the first layer, wherein the first and second layers have different affinities for at least one printing liquid; (b) imagewise providing atomized fluid particles (122) in an interaction zone (120) located above the surface (103) of the first layer; and (c) imagewise directing laser energy (125) into the interaction zone (120), wherein the laser energy (125) has a wavelength which is substantially absorbed by the atomized fluid particles (122) in the interaction zone, and the absorption of the laser energy causes the atomized fluid particles to imagewise impart kinetic energy to and etch the first layer (106). Lithographic and flexographic printing plates may be prepared according to this method, including waterless plates, negative and positive working plates, and processless plates.
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.
Abstract:
A lithographic printing plate precursor includes: a support; and an image-recording layer containing (A) a polymerization initiator, (B) a sensitizing dye and (C) a polymerizable compound, and the image-recording layer or an undercoat layer which is optionally provided between the support and the image-recording layer comprises (D) a polymer compound comprising (a1) a repeating unit having a side chain having a structure represented by the following formula (a1-1) and (a2) a repeating unit having a side chain having at least one structure of the formulae (a2-1), (a2-2), (a2-3), (a2-4), (a2-5) and (a2-6) as defined herein.
Abstract:
A backside coating is applied to lithographic printing plate precursors and this coating provides sufficient protection so that adjacent precursors are not scratched or otherwise damaged when stacked. The backside coating is readily dissolved during processing or development at a pH of at least 6.5 after the precursors are imaged.