Flexographic printing plate precursor
View Patent ↗Disclosed is a flexographic printing plate precursor in which formation of cracks and wrinkles in an infrared ablation layer is suppressed and the scratch resistance of the layer is improved. The precursor includes a support, photosensitive resin layer, and an infrared ablation layer that are laminated in the order presented. The binder polymer contained in the infrared ablation layer contains a polymer (A) and an acrylic resin (B). The polymer (A) contains the same structural unit as the structural unit contained in the binder polymer in the photosensitive resin layer. The mass ratio (A/B) of the component (A) with respect to the component (B) is within a range of 1/3 to 3/1. The difference between a plastic hardness (Ha) of the infrared ablation layer and a plastic hardness (Hb) of the photosensitive resin layer is 30 mN/mm 2 or smaller.
1. A flexographic printing plate precursor that comprises a support, a photosensitive resin layer, and an infrared ablation layer that are mutually laminated, wherein
the infrared ablation layer comprises a binder polymer and an infrared absorbing material,
the binder polymer contained in the infrared ablation layer comprises a polymer (A) and an acrylic resin (B), the polymer (A) comprising the same structural unit as a structural unit contained in a binder polymer in the photosensitive resin layer, and a mass ratio (A/B) of the component (A) with respect to the component (B) being within a range of 1/3 to 3/1,
the component (B) has a glass transition temperature within a range of 48° C. to 85° C., and
a difference between a plastic hardness (Ha) of the infrared ablation layer in a state in which the infrared ablation layer is laminated on the photosensitive resin layer and a plastic hardness (Hb) of the photosensitive resin layer is 30 mN/mm 2 or smaller.
2. The flexographic printing plate precursor according to claim 1 , wherein the component (B) has a storage elastic modulus within a range of 1.0×10 9 to 4.1×10 9 Pa.
3. The flexographic printing plate precursor according to claim 2 , wherein the binder polymer contained in the infrared ablation layer is compatible with a low-molecular-weight ingredient contained in the photosensitive resin layer.
4. The flexographic printing plate precursor according to claim 3 , wherein the photosensitive resin layer is made of a resin composition comprising a water-dispersible latex and a rubber as the binder polymer, a surfactant and/or a photopolymerizable unsaturated compound as the low-molecular weight ingredient, and a photopolymerization initiator.
5. The flexographic printing plate precursor according to claim 2 , wherein the photosensitive resin layer is made of a resin composition comprising a water-dispersible latex and a rubber as the binder polymer, a surfactant, a photopolymerizable unsaturated compound, and a photopolymerization initiator.
6. The flexographic printing plate precursor according to claim 1 , wherein the binder polymer contained in the infrared ablation layer is compatible with a low-molecular-weight ingredient contained in the photosensitive resin layer.
7. The flexographic printing plate precursor according to claim 6 , wherein the photosensitive resin layer is made of a resin composition comprising a water-dispersible latex and a rubber as the binder polymer, a surfactant, a photopolymerizable unsaturated compound, and a photopolymerization initiator.
8. The flexographic printing plate precursor according to claim 1 , wherein the photosensitive resin layer is made of a resin composition comprising a water-dispersible latex and a rubber as the binder polymer, a surfactant, a photopolymerizable unsaturated compound, and a photopolymerization initiator.