Abstract:
Radiation-sensitive element comprising (a) a substrate and (b) a radiation-sensitive coating comprising (i) at least one component selected from photoinitiators and sensitizer/coinitiator systems which absorbs radiation of a wavelength in the range of 250 to 1,200 nm; (ii) at least one oligomer A of formula (I) wherein X1, X2 and X3 are independently selected from straight-chain or cyclic C4-C12 alkylene and C6-C10 arylene, a heterocyclic group, a heteroaromatic group and combinations of two or more of the above, R1, R2 and R3 are independently selected from (II) and (III) with the proviso that (1) n=0 in at least one of the groups R1, R2 and R3, and (2) n>2 in at least one of the groups R1, R2 and R3, and (3) at least one group R6 is different from H in formula (III).
Abstract:
A method for making a lithographic printing plate is disclosed which comprises the steps of: (i) providing a negative-working, heat-sensitive lithographic printing plate precursor comprising a support having a hydrophilic surface or which is provided with a hydrophilic layer and a coating provided thereon, the coating comprising an image-recording layer which comprises hydrophobic thermoplastic polymer particles and a hydrophilic binder, wherein the hydrophobic thermoplastic polymer particles have an average particle size in the range from 45 nm to 63 nm, and wherein the amount of the hydrophobic thermoplastic polymer particles in the image-recording layer is at least 70% by weight relative to the image-recording layer; (ii) exposing the coating to heat or infrared light, thereby inducing coalescence of the thermoplastic polymer particles at exposed areas of the coating; (iii) developing the precursor by applying an aqueous alkaline solution, thereby removing non-exposed areas of the coating from the support, wherein the aqueous alkaline solution has a pH ≧10 and comprises a surfactant.
Abstract:
A heat-sensitive negative-working lithographic printing plate precursor includes on a grained and anodized aluminum support a coating including hydrophobic thermoplastic polymer particles, a hydrophilic binder, and an organic compound, wherein the organic compound includes at least one phosphonic acid group or at least one phosphoric acid group or a salt thereof.
Abstract:
A negative-working imageable element having an imageable layer on a substrate can be used to form an imaged element by imagewise exposing it to form exposed and non-exposed regions in the imageable layer. The imageable element also has a water-soluble topcoat disposed on the imageable layer. With or without a preheat step, the water-soluble topcoat is at least partially removed with water or an aqueous solution that incompletely or not at all removes the non-exposed regions of the imageable layer. The element is then mounted in a printing press and contacted with a fountain solution, a lithographic printing ink, or a combination of a fountain solution and a lithographic printing ink, thereby removing non-exposed regions of the imageable layer at the beginning of the printing operation.
Abstract:
The present invention provides a polymerizable composition comprising (A) a compound including a polymerizable unsaturated group and (B) a macromolecular compound including, at a side chain thereof, a structure represented by the following general formula (I): Z−M+ General formula (I) wherein Z− represents COCOO−, COO−, SO3−, or SO2—N−—R where R represents a monovalent organic group and M+ represents an onium cation. The present invention also provides a negative type planographic printing plate precursor responsive to an infrared laser, the precursor being superior in recording sensitivity and printing durability and using the polymerizable compound as a recording layer.
Abstract translation:本发明提供一种聚合性组合物,其含有(A)包含聚合性不饱和基团的化合物和(B)高分子化合物,其侧链具有下述通式(I)所示的结构: -formulae description =“在线公式”end =“lead”?> Z - SUP> M + SUPER +通用公式(I)<?in-line-formula description =“ 其中Z 0表示COCOO,SO 3,SO 3,SO 3, 或其中R代表一价有机基团,并且M + 代表鎓阳离子。 本发明还提供了响应于红外激光器的负型平版印刷版前体,其前体具有优异的记录灵敏度和印刷耐久性,并且使用可聚合化合物作为记录层。
Abstract:
A lithographic printing plate precursor includes an image-recording layer which is capable of being removed with at least one of printing ink and dampening water and contains a compound represented by the following formula (I), a sensitizing dye and a compound having at least one addition-polymerizable ethylenically unsaturated bond: wherein R1 represents a monovalent substituent, R2, R3, R4, R5 and R6 each independently represents a hydrogen atom, a halogen atom or a monovalent substituent, and X− represents an anion.
Abstract:
A method for making a lithographic printing plate is disclosed which comprises the steps of: (i) providing a negative-working, heat-sensitive lithographic printing plate precursor comprising a support having a hydrophilic surface or which is provided with a hydrophilic layer and a coating provided thereon, the coating comprising an image-recording layer which comprises hydrophobic thermoplastic polymer particles and a hydrophilic binder, wherein the hydrophobic thermoplastic polymer particles have an average particle size in the range from 45 nm to 63 nm and wherein the amount of the hydrophobic thermoplastic polymer particles in the image-recording layer is at least 70% by weight relative to the image-recording layer; (ii) exposing the coating to heat or infrared light, thereby inducing coalescence of the thermoplastic polymer particles at exposed areas of the coating; (iii) developing the precursor by applying an aqueous, alkaline solution, thereby removing non-exposed areas of the coating from the support, wherein the aqueous alkaline solution has a pH≧11 and comprises a phosphate buffer or a silicate buffer.
Abstract:
Provided is an image recording material capable of being directly recorded by various kinds of lasers, excellent in alkali-developability by alkaline developer and capable of forming an image which is good in curability by exposure. The image recording material is characterized by including on a support: an image recording layer containing a binder polymer (A); a compound (B) having a polymerizable unsaturated group, and a polymerization initiator (C); and a layer containing an organic ionic polymer (a) formed of a non-metallic element and an inorganic layered compound (b) that are layered in this order. It is preferable that the image recording layer further contains a dye (D) having an absorption maximum in a region of 300 to 1,200 nm, and it is preferable that the binder polymer (A) is a polymer having an alkali-soluble group.
Abstract:
A photosensitive composition containing: (A) a sensitizing dye; (B) a photopolymerization initiator; (c) a polymerizable compound having an ethylenically unsaturated bond; and (D) a polymer binder, wherein the photopolymerization initiator exhibits a reaction rate constant with a semiquinone radical anion in the range of 2.0×102 to 1.0×108 (mol−1·l·s−1).
Abstract:
A heat-sensitive lithographic printing plate of the present invention, which enables image recording by infrared-ray scanning exposure based on digital data and has excellent on-press developability, high resistance to scumming and a long press life, the heat-sensitive lithographic printing plate having on a support with a hydrophilic surface an image-forming layer made up of microcapsules in which a reactive group-containing hydrophobic compound is enclosed, a light-to-heat converting agent and a water-soluble compound which has a reactive group capable of reacting with the hydrophobic compound and is situated outside the microcapsules.