Abstract: A photosensitive resin structure for a printing plate, containing: a support (A); a photosensitive resin composition layer (B) comprising a thermoplastic elastomer (B-1) comprising a monovinyl-substituted aromatic hydrocarbon and a conjugated diene, an ethylenically unsaturated compound (B-2), and a photopolymerization initiator (B-3); and a non-infrared ray-shielding layer (C) ablatable with an infrared ray, wherein the non-infrared ray-shielding layer (C) comprises a polymer (C-2) having a carboxylate group and an ester bond group in a molecule thereof and an infrared ray absorber (C-3), and a proportion of an ester bond group such that carbon bonded to the ester bond group and carbon bonded to the carboxylate group are adjacent to each other in all the ester bond groups contained in the polymer (C-2) is 15% or more.

Abstract: A photosensitive resin structure for a printing plate, containing: a support (A); a photosensitive resin composition layer (B) comprising a thermoplastic elastomer (B-1) comprising a monovinyl-substituted aromatic hydrocarbon and a conjugated diene, an ethylenically unsaturated compound (B-2), and a photopolymerization initiator (B-3); and a non-infrared ray-shielding layer (C) ablatable with an infrared ray, wherein the non-infrared ray-shielding layer (C) comprises a polymer (C-2) having a carboxylate group and an ester bond group in a molecule thereof and an infrared ray absorber (C-3), and a proportion of an ester bond group such that carbon bonded to the ester bond group and carbon bonded to the carboxylate group are adjacent to each other in all the ester bond groups contained in the polymer (C-2) is 15% or more.

Abstract: The present invention provides a photosensitive resin composition comprising 100 parts by mass of a polyurethane prepolymer having an ethylenically unsaturated group, 10 to 150 parts by mass of an ethylenically unsaturated compound, and 0.01 to 10 parts by mass of a photopolymerization initiator, wherein the ethylenically unsaturated compound comprises 0.1 to 10 parts by mass of a polyfunctional ethylenically unsaturated compound having 6 or more (meth)acryloyl groups in a molecule thereof with respect to 100 parts by mass of the polyurethane prepolymer.

Abstract: The present invention provides a photosensitive resin composition comprising 100 parts by mass of a polyurethane prepolymer having an ethylenically unsaturated group, 10 to 150 parts by mass of an ethylenically unsaturated compound, and 0.01 to 10 parts by mass of a photopolymerization initiator, wherein the ethylenically unsaturated compound comprises 0.1 to 10 parts by mass of a polyfunctional ethylenically unsaturated compound having 6 or more (meth)acryloyl groups in a molecule thereof with respect to 100 parts by mass of the polyurethane prepolymer.

Abstract: There are provided a coating liquid for providing an infrared sensitive layer on a photosensitive resin surface, which is obtained by dissolving or dispersing in a specific ester solvent a binder polymer soluble in the solvent, an infrared absorbing substance and, if desired, a non-infrared opaque substance, and a process for obtaining a seamless photosensitive resin sleeve printing plate, which comprises using the same.

Abstract: There are provided a coating liquid for providing an infrared sensitive layer on a photosensitive resin surface, which is obtained by dissolving or dispersing in a specific ester solvent a binder polymer soluble in the solvent, an infrared absorbing substance and, if desired, a non-infrared opaque substance, and a process for obtaining a seamless photosensitive resin sleeve printing plate, which comprises using the same.

Abstract: The present invention provides a liquid photosensitive resin composition used for forming a printing plate to print on a corrugated board comprising:(A) 100 parts by weight of an unsaturated polyurethane prepolymer having a polyether polyol as a polyol segment,(B) 17 to 200 parts by weight of an ethylenically unsaturated compound and(C) 0.01 to 10 parts by weight of a photopolymerization initiator, characterized by comprising 17 to 65 parts by weight of an acrylate monomer represented by the following formula (I) per 100 parts by weight of the prepolymer of component (A) as the ethylenically unsaturated compound of component (B):CH.sub.2 .dbd.CH--CO--O--(C.sub.2 H.sub.4 O).sub.n --R (I)wherein n represents a number of 1 to 20, R represents a linear or branched alkyl group having 2 to 22 carbon atoms.A printing plate for use in printing a corrugated board obtained by curing the present composition has an increased impact resilience.

Abstract: A photosensitive resin composition for producing a relief printing plate is disclosed, which comprises a polymer selected from the group consisting of a prepolymer, a binder polymer and a mixture thereof, an ethylenically unsaturated monomer, a specific hindered amine and a photopolymerization initiator. Even when the photosensitive resin composition is excessively irradiated with strong actinic rays in order to cure the resin composition to its inner portion sufficiently, the surface of the resin composition does not undergo photodeterioration by virtue of the hindered amine contained therein, thereby imparting excellent toughness to the photocured resin composition throughout the entire thickness thereof. Thus, a relief printing plate having excellent printing resistance can be produced.