Abstract: The present invention aims to provide a flexographic printing original plate which exhibits improved sustainability of the ability of preventing the plate surface from staining. According to the present invention, there is provided a water-developable flexographic printing original plate including at least a support and a photosensitive resin layer provided on the support, in which the photosensitive resin layer contains a water-dispersible latex, a photopolymerizable unsaturated compound, a photopolymerization initiator, and a silicone compound. When the water-dispersible latex is one or more latex rubbers selected from the group consisting of polybutadiene rubber and poly(nitrile-butadiene) rubber, the silicone compound is a silicone compound having an amino group in the molecule and has a refractive index of 1.44 to 1.60. When the water-dispersible latex is poly(styrene-butadiene) rubber, the silicone compound is a silicone compound having an amino group in the molecule and has a refractive index of 1.

Abstract: A photosensitive resin composition for a flexographic printing original plate is disclosed which exhibits reduced adhesion of dust, dirt, and paper powder, resistance to UV ink and allows storage of the printing original plate for a long period of time. A water-developable photosensitive resin composition for flexographic printing, contains at least a polyamide and/or a polyamide block copolymer (a), a cross-linking agent having one or more unsaturated group(s) (b), a photo-polymerization initiator (c), and a fatty acid ester (d), wherein the fatty acid ester (d) has two or more hydroxyl groups and 24 or 25 carbon atoms in a molecule, wherein the fatty acid ester (d) is a fatty acid ester of a compound selected from fatty acids having a number of carbon atoms of 12 to 22, and wherein a content of the fatty acid ester (d) in the photosensitive resin composition is 0.2 to 6% by weight.

Abstract: The present invention aims to provide a flexographic printing original plate which exhibits improved sustainability of the ability of preventing the plate surface from staining. According to the present invention, there is provided a water-developable flexographic printing original plate including at least a support and a photosensitive resin layer provided on the support, in which the photosensitive resin layer contains a water-dispersible latex, a photopolymerizable unsaturated compound, a photopolymerization initiator, and a silicone compound. When the water-dispersible latex is one or more latex rubbers selected from the group consisting of polybutadiene rubber and poly(nitrile-butadiene) rubber, the silicone compound is a silicone compound having an amino group in the molecule and has a refractive index of 1.44 to 1.60. When the water-dispersible latex is poly(styrene-butadiene) rubber, the silicone compound is a silicone compound having an amino group in the molecule and has a refractive index of 1.

Abstract: A high-quality photosensitive resin composition is disclosed which not only exhibits a reduced adhesion of dust, dirt, and paper powder to a relief and a good resistance to a UV ink but also allows a storage of a printing original plate for a long period of time, even if this plate is a plate in a low hardness to be used for a flexographic printing. A water-developable photosensitive resin composition for flexographic printing contains at least a polyamide and/or a polyamide block copolymer (a), a cross-linking agent having one or more unsaturated group(s) (b), a photo-polymerization initiator (c), and a fatty acid ester (d), wherein the fatty acid ester (d) has two or more hydroxyl groups and 11 to 23 carbon atoms in a molecule, and wherein a content of the fatty acid ester (d) in the photosensitive resin composition is 0.2 to 6% by weight.

Abstract: A photosensitive resin composition for a flexographic printing original plate is disclosed which exhibits reduced adhesion of dust, dirt, and paper powder, resistance to UV ink and allows storage of the printing original plate for a long period of time. A water-developable photosensitive resin composition for flexographic printing, contains at least a polyamide and/or a polyamide block copolymer (a), a cross-linking agent having one or more unsaturated group(s) (b), a photo-polymerization initiator (c), and a fatty acid ester (d), wherein the fatty acid ester (d) has two or more hydroxyl groups and 24 or 25 carbon atoms in a molecule, wherein the fatty acid ester (d) is a fatty acid ester of a compound selected from fatty acids having a number of carbon atoms of 12 to 22, and wherein a content of the fatty acid ester (d) in the photosensitive resin composition is 0.2 to 6% by weight.

Abstract: The present invention provides a photosensitive resin composition for a relief printing original plate which can achieve both of a printing reproducibility of gradation of a highlight part and a printing durability, and can further achieve a low plate surface tackiness. A photosensitive resin composition for a relief printing original plate containing water-soluble or water-dispersible polyamide, a photopolymerizable unsaturated compound and a photopolymerization initiator as essential ingredients, characterized in that a total of a content of an alicyclic structural unit obtained from diamine and a content of an alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 30 to 90 molar %, and the content of the alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 20 molar % or more.

Abstract: The present invention provides a photosensitive resin composition for a relief printing original plate which can achieve both of a printing reproducibility of gradation of a highlight part and a printing durability, and can further achieve a low plate surface tackiness. A photosensitive resin composition for a relief printing original plate containing water-soluble or water-dispersible polyamide, a photopolymerizable unsaturated compound and a photopolymerization initiator as essential ingredients, characterized in that a total of a content of an alicyclic structural unit obtained from diamine and a content of an alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 30 to 90 molar %, and the content of the alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 20 molar % or more.