FLEXOGRAPHIC PRINTING ORIGINAL PLATE

摘要

The present invention aims to provide a flexographic printing original plate where, although it is a flexible aqueous developing plate, reproducibility of fine lines is good. A flexographic printing original plate which is a photosensitive printing original plate where at least (A) a supporting member, (B) a photosensitive resin layer, (C) a protective layer for preventing the polymerization inhibition due to oxygen in the photosensitive resin layer and (D) a heat-sensitive mask layer are successively layered, characterized in that , the photosensitive resin layer (B) is a layer which is able to be developed by water, Young' s modulus of the protective layer (C) is 4 MPa to 35 MPa, layer thickness of the protective layer (C) is 0.2 µm to 2.0 µm and Young's modulus (MPa) and layer thickness (µm) of the protective layer (C) satisfy the following formula 1: 1 ‰¤ Young¹s modulus × Layer thickness 2 ‰¤ 18