Abstract:
A lithographic printing plate precursor comprising a support and an image-recording layer containing at least one infrared absorbing agent of a cyanine dye in which a HOMO energy level of each of substituents present on both terminal nitrogen atoms is −10.0 eV or higher.
Abstract:
A method of making a heat-sensitive lithographic printing plate precursor is disclosed which comprises the steps of (i) providing a web of a lithographic support having a hydrophilic surface; (ii) applying on the hydrophilic surface of the web a coating comprising a phenolic resin; (iii) drying the coating by supplying heat to the coated web; (iv) a cooling step wherein the web temperature is reduced at an average cooling rate which is higher than if the web would be kept under ambient conditions but not higher than 30° C./s; and (v) winding the precursor on a core or cutting the precursor into sheets. The cooling step provides a significant improvement of the aging behavior of the precursor. A stable sensitivity is obtained shortly after coating.
Abstract:
The present invention provides a photosensitive resin composition having improved stability in a bright room, which can provide a printing plate material having superior image remaining property and printing durability, which can be subjected to alkaline development. Accordingly, the present invention relates to a photosensitive resin composition comprising an ethylenically unsaturated compound, an alkali-soluble resin, a near-infrared-absorbing dye, a halomethyl group-containing compound, a nitroxyl compound and an organo boron anion-containing compound, and a printing plate material comprising a substrate and a photosensitive layer formed by applying the photosensitive resin composition on the substrate.
Abstract:
A lithographic printing plate precursor comprises an image-forming layer containing a polymerization initiator and a polymerizable compound, and a hydrophilic support, wherein the lithographic printing plate precursor comprises a compound containing at least one functional group having an interaction with a surface of the hydrophilic support.
Abstract:
Disclosed is a light sensitive composition comprising an addition polymerizable ethylenically unsaturated monomer A), a photopolymerization initiator B), a polymer binder C), and a cation-polymerization compound D), wherein the photopolymerization initiator D) is an iron-arene complex.
Abstract:
The present invention provides a planographic printing plate precursor comprising a substrate and a negative image recording layer provided on the substrate containing: a compound that generates a radical or an acid by light or heat; a polymerizable compound or a crosslinking compound; and an infrared ray absorbing agent, wherein a dynamic friction coefficient of the outermost surface of the planographic printing plate precursor, at the side of the negative image recording layer being provided toward an inserting paper inserted into between the planographic printing plate precursors when the planographic printing plate precursors are laminated, is within a range from 0.2 to 0.7, as well as a planographic printing plate precursor laminate comprising the pluralty of the planographic printing plate precursors and inserting paper.
Abstract:
The present invention provides an infrared-sensitive planographic printing plate precursor including: a support; a recording layer on one surface of the support, which recording layer contains a water-insoluble and alkali-soluble resin, an infrared absorber and a long-chain alkyl group-containing polymer, and is capable of forming an image by infrared irradiation; and a back coating layer on the other surface of the support, which back coating layer contains an organic polymer and has a thickness of 0.3 μm or more.
Abstract:
A laser sensitive lithographic printing plate comprises an electrochemically grained, anodized, hydrophilically treated aluminum substrate with a reflection optical density of 0.30 or higher; a free radical polymerizable photosensitive layer; and a water soluble or dispersible overcoat. The photosensitive layer comprises a polymeric binder, a free radical polymerizable monomer, a free radical initiator, and a sensitizing dye. Such dark aluminum substrate in combination with the hydrophilic treatment allows both clean background and good printing durability. Such plate can be exposed with a suitable laser at lower dosage to cause hardening in the exposed areas. The exposed plate can be developed with a regular liquid developer or with ink and/or fountain solution.
Abstract:
A hydrophilic substrate comprising: a hydrophilic layer; and a support, wherein the hydrophilic layer contains a hydrophilic particle having a surface area of from 1 to 1,000 m2/g.
Abstract:
A heat-sensitive lithographic printing plate precursor is disclosed which comprises a support having a hydrophilic surface and a coating which does not dissolve in an aqueous alkaline developer in the unexposed areas and which becomes soluble in an aqueous alkaline developer in the exposed areas, and an intermediate layer between said hydrophilic surface or said hydrophilic layer and said coating, wherein the intermediate layer comprises a first polymer having a first monomeric unit of formula I wherein R1, R2 and R3 are independently a hydrogen atom or an optionally substituted alkyl group, R4 and R5 are independently an optionally substituted alkyl, cycloalkyl, aryl or arylalkyl group. The precursor exhibits an excellent differentiation in dissolution kinetics between the exposed and non-exposed areas of the coating and a high chemical resistance against printing liquids and press chemicals.