Photosensitive resin composition, printing plate precursor and flexographic printing plate
View Patent ↗Disclosed is a photosensitive resin composition that provides an excellent water developability, drying property, and image reproducibility. The photosensitive resin composition comprises a water-dispersible latex (A), a rubber (B), a surfactant (C), a photopolymerizable monomer (D), and a photopolymerization initiator (E). A ratio of a mass of the component (C) to a total mass of the components (A), (B), and (C) is within a range of 0.1 to 20%. A ratio of a mass of the component (A) to a total mass of the components (A) and (B) is within 20 to 90%. A size of a dispersed phase consisting mainly of the component (B) is 10 μm or smaller.
1. A photosensitive resin composition comprising
a water-dispersible latex (A), a rubber (B) other than a (meth)acrylic polymer, a sulfonate surfactant (C), a photopolymerizable component (D) comprising a (meth)acrylic modified polymer, and a photopolymerization initiator (E), wherein
a polymer content of the composition other than the (meth)acrylic polymer consists of the components (A) and (B),
a ratio of a mass of the component (C) to a total mass of the components (A), (B), and (C) is within a range of 0.1 to 20%,
a ratio of a mass of the component (A) to a total mass of the components (A) and (B) is within 20 to 90%, and
a size of a dispersed phase consisting mainly of the component (B) is 10 μm or smaller.
2. A photosensitive resin composition according to claim 1 , wherein the ratio of the mass of the component (C) to the total mass of the components (A), (B), and (C) is within a range of 4 to 20%.
3. The photosensitive resin composition according to claim 2 , wherein the composition has a swelling ratio of 50% or smaller against a solvent ink for flexographic printing after the composition is cured.
4. The photosensitive resin composition according to claim 3 , wherein the photosensitive resin composition further contains 0.1 to 30 mass % of a plasticizer (F).
5. The photosensitive resin composition according to claim 4 , wherein the component (F) is a paraffin oil.
6. The photosensitive resin composition according to claim 5 , wherein the component (B) comprises one or more rubbers selected from butadiene rubbers and nitrile rubbers.
7. The photosensitive resin composition according to claim 2 , wherein the photosensitive resin composition further contains 0.1 to 30 mass % of a plasticizer (F).
8. The photosensitive resin composition according to claim 7 , wherein the component (F) is a paraffin oil.
9. The photosensitive resin composition according to claim 8 , wherein the component (B) comprises one or more rubbers selected from butadiene rubbers and nitrile rubbers.
10. The photosensitive resin composition according to claim 1 , wherein the composition has a swelling ratio of 50% or smaller against a solvent ink for flexographic printing after the composition is cured.
11. The photosensitive resin composition according to claim 10 , wherein the photosensitive resin composition further contains 0.1 to 30 mass % of a plasticizer (F).
12. The photosensitive resin composition according to claim 11 , wherein the component (F) is a paraffin oil.
13. The photosensitive resin composition according to claim 12 , wherein the component (B) comprises one or more rubbers selected from butadiene rubbers and nitrile rubbers.
14. The photosensitive resin composition according to claim 1 , wherein the photosensitive resin composition further contains 0.1 to 30 mass % of a plasticizer (F).
15. The photosensitive resin composition according to claim 14 , wherein the component (F) is a paraffin oil.
16. The photosensitive resin composition according to claim 15 , wherein the component (B) comprises one or more rubbers selected from butadiene rubbers and nitrile rubbers.
17. A printing plate precursor comprising a photosensitive layer made of the photosensitive resin composition according to claim 2 .
18. A flexographic printing plate made from the printing plate precursor according to claim 17 .
19. A printing plate precursor comprising a photosensitive layer made of the photosensitive resin composition according to claim 1 .
20. A flexographic printing plate made from the printing plate precursor according to claim 19 .
21. The photosensitive resin composition according to claim 1 , wherein the photopolymerizable component (D) further comprises a (meth)acrylic monomer.
22. The photosensitive resin composition according to claim 21 , wherein the amount of the (meth)acrylic monomer is 5 to 15 parts by mass with respect to 15 parts by mass of the (meth)acrylic modified polymer.
23. The photosensitive resin composition according to claim 1 , wherein the photopolymerizable component (D) further comprises a (meth)acrylic oligomer.