Abstract: Provided are: a mold release film, which has excellent mold releasability to a semiconductor resin package and does not easily generate warpage, wrinkles and the like; and a method for obtaining a semiconductor resin package having excellent dimensional accuracy by using such mold release film. The mold release film for manufacturing a semiconductor resin package has one or more base material layers (C), a pair of outermost layers (A) which sandwich the base material layers (C) and contain a 4-methyl-1-pentene polymer as a main component, and a pair of adhesive layers (B) which adhere together the base material layers (C) and the outermost layers (A).

Abstract: An object of the present invention is to provide a lithographic printing plate precursor which is less apt to suffer from contamination by ablation in forming an image and having an excellent printing performance through image formation. A lithographic printing plate precursor comprises a base material (I), a photosensitive layer (II) containing a light/heat conversion agent on the base material (I), and a layer (III) covering the photosensitive layer (II), wherein the layer (III) covering the photosensitive layer contains both a water-soluble polymer and a hydrophobic polymer, and contains substantially no light/heat conversion agent is provided. The layer (III) covering the photosensitive layer is preferred to contain the water-soluble polymer and the hydrophobic polymer in a proportion of from 10:90 to 90:10 by mass.

Abstract: The present invention provides a precursor that may provide a lithographic printing plate having an excellent image forming capability and having not only good hydrophilicity in a non-image part but also excellent printing resistance. Specifically, the present invention provides a lithographic printing plate precursor having a photosensitive layer containing a hydrophilic polymer, a crosslinking agent, hydrophobic polymer particles and a photo-thermal converter, wherein the hydrophilic polymer does not substantially contain, in its polymer chain, any of alcoholic hydroxyl groups and carboxyl groups (for example, 1.5% or less by mol of the repeating units of the hydrophilic polymer contain an alcoholic hydroxyl or carboxyl group).

Abstract: It relates to a processless lithographic printing plate requiring no post treatments after exposure to laser, wherein a difference between the lightness (L*1) of a laser unexposed area and the lightness (L*2) of a laser exposed area after irradiation with laser is 10?(L*2?L*1)<100. An object of the present invention is to provide plate bodies having excellent printing plate inspection in a lithographic printing plate in which drawing with laser light and processless are realized. When the lithographic printing plate of the present invention is used, it is possible to provide a processless lithographic printing plate, which is excellent in sensitivity and resolution, requires no treatments such as development, wiping-off or the like and is excellent in printing plate inspection in the laser exposed area by changing only the surface of the laser exposed area into the oleophilicity.

Abstract: A lithographic printing original plate, a lithographic printing plate using the lithographic printing original plate and a process for producing the lithographic printing plate are disclosed. The lithographic printing original plate has, on a substrate, a photosensitive layer made of a crosslinked polymer comprising a hydrophilic polymer, a crosslinking agent and a light absorbing compound or comprising a hydrophilic polymer, a crosslinking agent, a light absorbing compound and a hydrophobic polymer, and has properties that the photosensitive layer is changed from ink-repellent to ink-receptive by irradiation with a light.

Abstract: It relates to a photosensitive resin composition for lithographic printing plate characterized by the fact that the photosensitive resin composition for lithographic printing plate comprises not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group and not less than 0.5% by weight and not more than 20% by weight, based on the amount of the hydrophilic polymer, of a compound that inhibits hydrogen bond within the molecule and/or between the molecules of the hydrophilic polymer. The lithographic printing original plate preferable has a hydrophilic resin photosensitive layer obtained by crosslinking a photosensitive resin composition that comprises not less than 10% by weight and not more than 90% by weight of a hydrophilic polymer having at least a hydrophilic group and not less than 0.

Abstract: A lithographic printing original plate, a lithographic printing plate using the lithographic printing original plate and a process for producing the lithographic printing plate are disclosed. The lithographic printing original plate has, on a substrate, a photosensitive layer made of a crosslinked polymer comprising a hydrophilic polymer, a crosslinking agent and a light absorbing compound or comprising a hydrophilic polymer, a crosslinking agent, a light absorbing compound and a hydrophobic polymer, and has properties that the photosensitive layer is changed from ink-repellent to ink-receptive by irradiation with a light.