Abstract:
A lithographic printing plate precursor is disclosed including on a support a coating comprising (i) a photopolymerisable layer including a polymerisable compound, a first infrared absorbing dye including at least one electron withdrawing substituent and a photoinitiator; and (ii) a top layer provided above the photopolymerisable layer which includes a second infrared absorbing compound which includes a thermocleavable group which transforms into a group which is a stronger electron-donor upon exposure to heat and/or IR radiation, and is capable of forming a print-out image upon exposure to heat and/or IR radiation.
Abstract:
A polymerizable composition contains a binder polymer containing a functional group having a dipole moment of 3.8 debye or more and being represented by the formula (1), (2), (3), (4) or (5) as defined herein, a radical polymerizable compound and a radical polymerization initiator.
Abstract:
A lithographic printing plate precursor, comprising a support having thereon an image-recording layer containing (A) an infrared absorbing agent, (B) a radical polymerization initiator, (C) a radical polymerizable compound, (D) a polymer compound containing a polyoxyalkylene structure and (E) an ultraviolet absorbing agent and being capable of forming an image by supplying at least one of printing ink and dampening water on a printing machine after imagewise exposure to remove an unexposed area of the image-recording layer.
Abstract:
A lithographic printing plate precursor includes: an aluminum support; an intermediate layer; and an image-recording layer, in this order, wherein at least one of the intermediate layer and the image-recording layer contains a compound having an amino group and a functional group capable of interacting with the aluminum support in a molecule.
Abstract:
A processing method of a lithographic printing plate precursor includes: exposing imagewise a lithographic printing plate precursor comprising a support on a surface of which at least one of: a hydrophilizing treatment; and an undercoat layer has been provided and an image-recording layer, to cure an exposed area of the image-recording layer; and undergoing developing processing with an aqueous solution having pH of from 2 to 10, wherein the aqueous solution comprises an amphoteric surfactant and an anionic surfactant selected from an anionic surfactant having an aliphatic chain and a total number of carbon atoms included in the aliphatic chain of 6 or more and an anionic surfactant having an aromatic ring and a total number of carbon atoms of 12 or more, and a content of the anionic surfactant is from 0.1 to 3.3% by weight of the aqueous solution.
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:
A lithographic printing plate precursor is provided that, using laser exposure, exhibits an excellent capacity for plate inspection, an excellent on-press development performance or gum development performance, and an excellent scumming behavior, while maintaining a satisfactory printing durability. There is also provided a method of lithographic printing that uses this lithographic printing plate precursor. The lithographic printing plate precursor comprises an image recording layer having (A) a nonionic polymerization initiator that contains at least two cyclic imide structures, and (B) a compound that has at least one addition-polymerizable ethylenically unsaturated bond.
Abstract:
A method of treating an on-press developable lithographic printing plate with an aqueous treating solution after imagewise exposure and before on-press development is described. 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 imagewise exposed with a radiation, overall treated with a treating solution to cause at least one chemical or physical change in the photosensitive layer or on the substrate surface, and then on-press developed with ink and/or fountain solution. Such a treatment allows improvement on the performance of the imagewise exposed plate by, for example, improving the white light stability, forming visible imaging, increasing the hydrophilicity of the substrate, or increasing the developability of the photosensitive layer.
Abstract:
An image-forming method includes: exposing a negative type image-forming material including a support and an image-recording layer containing a binder polymer containing at least one group capable of being converted to a sulfonate upon a reaction with an aqueous solution containing at least one of a sulfite and a bisulfite, a sensitizing dye, a polymerization initiator, and a compound having an ethylenically unsubstituted bond; and removing an unexposed area of the image-recording layer with an aqueous solution containing at least one of a sulfite and a bisulfite.
Abstract:
A photosensitive composition includes a cyanine dye that has, on a methine chain thereof, a substituent which is a cation moiety of an onium salt structure.