| 摘要 |
PURPOSE:To manufacture a material giving a magnetic printing master capable of repeating copy many times by forming a photosensitive foaming layer on a transparent resin film, forming a specified adhesive layer and a magnetic layer on other transparent film in order, and superposing said foaming layer on said magnetic layer. CONSTITUTION:Photosensitive foaming layer 12 having several tens -100mum thickness is formed on cover film 11 such as transparent polyester film by dispersing a diazo or azide compound in a binder resin. Adhesive layer 14 made of silicone resin or composed of the resin and an adhesive resin is formed on transparent base film 15, and magnetic layer 13 having 120-250 mesh roughness is screen printed on layer 14. Layers 12, 13 are then set opposite to each other and laminated by heating and pressurization to obtain material 1 for a magnetic printing master. After bringing original 2 into contact with material 1 on the film 11 side, material 1 is exposed to ultraviolet rays UV from the film 15 side and irradiated with while light under heating to foam unexposed part 3, and film 11 is peeled off to obtain printing master 1'. |
