| abstract |
(57) [Abstract] [Problem] Excellent adhesion between an image layer (image part) and a substrate, Offset printing plate prepared by direct plate making using inkjet method, thermal transfer method or discharge transfer method, which has excellent water retention in dampening water of non-image area and is hard to stain, and has improved sharpness of printed image. An offset printing plate substrate that can be manufactured is provided. In an offset printing plate substrate comprising a support and an image receiving layer provided thereon, the image receiving layer is a layer having a three-dimensional network structure having a porosity of 30 to 80%, and A substrate for an offset printing plate, characterized in that the three-dimensional network structure is formed from inorganic fine particles having an average primary particle diameter of 100 nm or less and a water-soluble resin, and offset printing by direct plate making using this substrate. How to make a plate. |