Abstract: A lithographic printing plate precursor has an infrared radiation-sensitive image-recording layer containing an IR absorber, and an ozone-blocking material of 1500 or less molecular weight and has structure (I), (II), or (III): wherein R is a hydrocarbon having 14-30 carbon atoms; m is 1 or 2; n is 1-6; the sum of m and n is >2 and <8; and A is a multivalent organic moiety free of R and OH groups and has a valence m+n; wherein R1 and R2 are alkyl groups of 14-22 carbon atoms, and o is 1-3; R3C(?O)NR4R5?? (III) wherein R3 is an alkenyl with a C?C bond within a carbon-carbon chain of 16-30 carbons, and R4 and R5 are hydrogen or unsubstituted alkyls of 1-4 carbon atoms. Such ozone-blocking materials can be used to protect infrared radiation-sensitive dyes that may be degraded by ozone and thus improve imaging sensitivity.

Abstract: A lithographic printing plate precursor has an infrared radiation-sensitive image-recording layer containing an IR absorber, and an ozone-blocking material of 1500 or less molecular weight and has structure (I), (II), or (III): wherein R is a hydrocarbon having 14-30 carbon atoms; m is 1 or 2; n is 1-6; the sum of m and n is >2 and <8; and A is a multivalent organic moiety free of R and OH groups and has a valence m+n; wherein R1 and R2 are alkyl groups of 14-22 carbon atoms, and o is 1-3; R3C(?O)NR4R5?? (III) wherein R3 is an alkenyl with a C?C bond within a carbon-carbon chain of 16-30 carbons, and R4 and R5 are hydrogen or unsubstituted alkyls of 1-4 carbon atoms. Such ozone-blocking materials can be used to protect infrared radiation-sensitive dyes that may be degraded by ozone and thus improve imaging sensitivity.

Abstract: A negative-working infrared radiation-sensitive lithographic printing plate precursor can be imaged and developed on-press to provide a lithographic printing plate. Such precursor has an initiator composition that contains compound A of Structure (I) and one or more compounds collectively as compound B of Structure (II) or Structure (III): wherein R1, R2, R3, R4, R5 and R6 are independently alkyl groups each having 3 to 6 carbon atoms; at least one of R3 and R4 is different from R1 or R2; the difference of total number of carbon atoms in R1 and R2 and the total number of carbon atoms in R3 and R4 is 0, 1, or 2; the difference of total number of carbon atoms in R1 and R2 and the total number of carbon atoms in R5 and R6 is 0, 1, or 2; and X1, X2 and X3 are the same or different anions.

Abstract: A lithographic printing plate precursor has a substrate comprising a hydrophilic surface and two opposing edges; a radiation-sensitive imagable layer, and optionally, a protective layer disposed over that layer. The precursor has a shear droop at each opposing edge, each shear droop having a shear droop depth Y of 20-200 ?m and a shear droop width X of 500-2000 ?m. The precursor also has a hydrophilic coating band extending from each of the two opposing edges inwardly along the hydrophilic surface independently to provide a hydrophilic coating band width A of at least 1.5 times the shear droop width X. This hydrophilic coating band comprises amphoteric surfactant(s) in an amount greater than all other surfactants. Such individual precursors are obtained by cutting a continuous radiation-sensitive web into strips and such cutting creates the shear droop that can result in edge staining if the hydrophilic coating band is not present.

Abstract: A negative-working infrared radiation-sensitive lithographic printing plate precursor can be imaged and developed on-press to provide a lithographic printing plate. Such precursor has an initiator composition that contains compound A of Structure (I) and one or more compounds collectively as compound B of Structure (II) or Structure (III): wherein R1, R2, R3, R4, R5 and R6 are independently alkyl or alkoxy groups each having 2 to 9 carbon atoms; at least one of R3 and R4 is different from R1 or R2; the difference of total number of carbon atoms in R1 and R2 and the total number of carbon atoms in R3 and R4 is 0 to 4; the difference of total number of carbon atoms in R1 and R2 and the total number of carbon atoms in R5 and R6 is 0 to 4; and X1, X2 and X3 are the same or different anions.

Abstract: The present invention relates to a lithographic printing plate precursor, comprising: a substrate; and an imaging layer formed on the substrate, wherein the imaging layer is prepared from a composition comprising at least one radical-polymerizable compound, at least one radical polymerization initiator, and at least one polymer particle which has an average particle diameter of 300 nm or more, and two or more poly(alkyleneoxide) moieties. The present invention can provide a lithographic printing plate precursor which is on-press developable and has excellent on-press development stability overtime and printing properties.

Abstract: The present invention has an objective of providing a composition for a lithographic printing plate, which provides an image-forming layer exhibiting superior ink receptivity and uniformity, and in which a coating solution containing the composition possesses a good defoaming property and can effectively form an image-forming layer at high speed. In addition, the present invention has another objective of providing a lithographic printing plate precursor or a dummy plate which can be produced at high speed with superior production efficacy. The present invention provides a composition for a lithographic printing plate containing a fluoroaliphatic group-containing copolymer having a specific chemical structure, the lithographic printing plate precursor or a dummy plate containing a layer having the aforementioned composition.

Abstract: A negative-working lithographic printing plate precursor has a substrate and an imageable layer disposed on the substrate. This imageable is removable with a lithographic printing ink, a fountain solution, or both. The imageable layer comprises (A) a free radical polymerizable compound, (B) a free radical polymerization initiator, and (C) a polymer that has a polysaccharide backbone and a free radical polymerizable group that is different than (A). Such precursors are on-press developable and exhibit excellent on-press development stability over time and excellent printing properties.

Abstract: A negative-working, infrared radiation-sensitive lithographic printing plate precursor is exposed and processed on-press to provide a lithographic printing plate. This precursor has an infrared radiation-sensitive imageable layer comprises free radical imaging chemistry; an infrared radiation absorber; a particulate primary polymeric binder comprising polyalkylene oxide segments having an average particle size (D1) of at least 50 nm and up to and including 1000 nm; and a particulate secondary resin having an average particle size (D2) of at least 3 ?m and up to and including 10 ?m. The imageable layer has an average dry thickness (t) of at least 1 ?m and up to and including 4 ?m and satisfies Equation (1): D2/1.4>t>D1?? (1) and the average dry thickness (t) is defined by Equation (2): t=w/r?? (2) wherein w is the dry coverage of the imageable layer in g/m2 and r is 1 g/cm3.

Abstract: A positive-working lithographic printing plate precursor exhibits satisfactory developability and has long print run length, satisfactory scratch resistance, and exhibits improved ink receptivity. This precursor has an image forming layer comprising a water-insoluble and alkali-soluble or alkali-dispersible resin. The image forming layer comprises at least a lower layer and an upper layer. A resin in at least one of the lower layer and the upper layer is a polyurethane including a recurring unit comprising a substituent having an acidic hydrogen atom and a recurring unit represented by the following formula: wherein Rf is an alkyl or polyether group in which at least 50% of hydrogen atoms have been fluorinated, R1 is a hydrogen atom, or a substituted or non-substituted alkyl group, m is 0 or 1 to 10, n is 1 to 30, and x is 1 to 4.

Abstract: The present invention has an objective of providing a composition for a lithographic printing plate, which provides an image-forming layer exhibiting superior ink receptivity and uniformity, and in which a coating solution containing the composition possesses a good defoaming property and can effectively form an image-forming layer at high speed. In addition, the present invention has another objective of providing a lithographic printing plate precursor or a dummy plate which can be produced at high speed with superior production efficacy. The present invention provides a composition for a lithographic printing plate containing a fluoroaliphatic group-containing copolymer having a specific chemical structure, the lithographic printing plate precursor or a dummy plate containing a layer having the aforementioned composition.

Abstract: An object of the present invention is to provide a lithographic printing plate precursor which exhibits satisfactory developability using a developing solution having the pH of 12 or lower and has long print run length and satisfactory scratch resistance, and also exhibits improved ink receptivity.

Abstract: To provide an infrared-sensitive or heat-sensitive lithographic printing plate precursor which has high printing durability and wide development latitude, and also has good developing properties capable of preventing the formation of deposits during the development. In an infrared-sensitive or heat-sensitive lithographic printing plate precursor, comprising a substrate, a first image recording layer formed on the substrate, and a second image recording layer formed on the first image recording layer, the first image recording layer contains a resin which is soluble or dispersible in an aqueous alkali solution, and the second image recording layer contains a polyurethane which has a substituent having an acidic hydrogen atom.

Abstract: To provide an infrared-sensitive or heat-sensitive lithographic printing plate precursor which has high printing durability and wide development latitude, and also has good developing properties capable of preventing the formation of deposits during the development. In an infrared-sensitive or heat-sensitive lithographic printing plate precursor, comprising a substrate, a first image recording layer formed on the substrate, and a second image recording layer formed on the first image recording layer, the first image recording layer contains a resin which is soluble or dispersible in an aqueous alkali solution, and the second image recording layer contains a polyurethane which has a substituent having an acidic hydrogen atom.

Abstract: The present invention provides a photosensitive lithographic printing plate which displays superior ink receptivity and superior film strength of the photosensitive layer (image area). The photosensitive lithographic printing plate is produced by providing, on top of a support, a photosensitive composition comprising a fluororesin having a fluoro aliphatic group of 3 to 20 carbon atoms in which at least two of three terminal hydrogen atoms are substituted for fluorine atoms, and an ethylene based unsaturated group, as well as a negative photosensitive compound.

Abstract: Thermally imageable elements useful in lithographic printing are disclosed. The element has a layer of an imageable composition over a support. The imageable composition contains a supramolecular polymer that includes QHB-modified polymeric molecules having the structure A-L-B. A and B are each different QHB-modified portions selected from QHB-modified phenolic portions, QHB-modified acrylic portions, QHB-modified polyester portions, and QHB-modified polyurethane portions. L is a joining group. The elements are suitable for the preparation of lithographic printing plates.

Abstract: The present invention provides a photosensitive lithographic printing plate which displays superior ink receptivity and superior film strength of the photosensitive layer (image area). The photosensitive lithographic printing plate is produced by providing, on top of a support, a photosensitive composition comprising a fluororesin having a fluoro aliphatic group of 3 to 20 carbon atoms in which at least two of three terminal hydrogen atoms are substituted for fluorine atoms, and an ethylene based unsaturated group, as well as a negative photosensitive compound.