US 12,259,655 B1
Manufacturing method of flexographic printing plate and printing method
Hiroki Akiyama, Tokyo (JP); Akinao Nakamura, Tokyo (JP); Takumi Ishii, Tokyo (JP); and Yusuke Shimizu, Tokyo (JP)
Assigned to ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
Appl. No. 18/037,444
Filed by ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
PCT Filed Mar. 3, 2023, PCT No. PCT/JP2023/008172
§ 371(c)(1), (2) Date May 17, 2023,
PCT Pub. No. WO2024/184980, PCT Pub. Date Sep. 12, 2024.
Int. Cl. G03F 7/32 (2006.01); G03F 7/095 (2006.01); G03F 7/20 (2006.01)
CPC G03F 7/325 (2013.01) [G03F 7/095 (2013.01); G03F 7/202 (2013.01)] 8 Claims
 
1. A manufacturing method of a flexographic printing plate, comprising developing by subjecting a plate surface of a flexographic printing original plate comprising at least a support, a photosensitive resin composition layer, and an infrared ablation layer sequentially stacked to brushing with a brush while supplying an organic solvent-based developer to the plate surface, wherein
the organic solvent-based developer comprises a polymer gel,
the polymer gel is constituted of a polymer,
the polymer gel is present in a state dispersed in the organic solvent-based developer without being dissolved in the organic solvent-based developer,
the polymer gel is a particle having a number average particle diameter measured in a dispersed state in a developer of 40 nm or more and 400 nm or less,
the organic solvent-based developer comprises 0.1% by mass or more and 10.0% by mass or less of a polymer gel, and
a content of the polymer gel is a ratio of a mass of the polymer gel that does not contain the organic solvent-based developer solution inside based on a total amount of the organic solvent-based developer.
 
8. A printing method comprising:
obtaining a flexographic printing plate by the manufacturing method of the flexographic printing plate according to claim 1, and
performing printing using the flexographic printing plate.