摘要:
A member for masking films which includes a base film transparent to ultraviolet rays and, on one surface thereof, an ultraviolet-shielding resin layer capable of being removed by irradiation with laser light beams and having an average thickness of 0.1 to 30 μm, wherein the ultraviolet-shielding resin layer is a multilayer structure composed of two or more layers including a resin layer (A) having a high carbon black content and a resin layer (B) having a low carbon black content, the layer (A) and the layer (B) being located on the base-film side and on the printing-plate side of ultraviolet-shielding resin layer, respectively, and the ultraviolet-shielding resin layer has specific optical properties. This member for masking films has the following features: the accurate and precise removal of the ultraviolet-shielding resin layer using a low-energy laser beam gives areas with uniform light transmittance; the ultraviolet-shielding resin is resistant to scratches; and positioning is easy, and when making close contact with a plate, air trapping is less likely to occur so that the entire surface easily comes into close contact with a printing material.
摘要:
A member for a mask film comprising a substrate film transmitting ultraviolet light and a resin layer not transmitting ultraviolet light which is disposed on one face of the substrate film, allows elimination of color by irradiation with a laser beam, has a transmittance of ultraviolet light of 0.1% or smaller and has a thickness of 0.1 to 30 μm; a process for producing a mask film using the member; and a process for producing a printing plate of a photosensitive resin using the mask film. The mask is advantageously used for preparing a printing plate such as a photosensitive printing plate. The member for a mask provides the mask film by etching with a laser beam.
摘要:
A member for masking films including a base film transparent to ultraviolet rays, an ultraviolet-shielding resin layer capable of being removed by irradiation with a laser light beam and having an average thickness of 0.1 to 30 μm, and a protective layer having a thickness of 0.05 to 1.5 μm and comprising, as a resin component, a polyester-base resin having a glass-transition temperature of not less than 40° C. laminated to a surface of the outermost layer of the ultraviolet-shielding resin layer, wherein the ultraviolet-shielding resin layer is a multilayer structure composed of two or more layers including a resin layer (A) having a high carbon black content and a resin layer (B) having a low carbon black content, the layer (A) and the layer (B) being located on the base-film side and on the printing-plate side of the ultraviolet-shielding resin layer, respectively.