abstract |
(57) [Summary] [PROBLEMS] To dramatically improve sensitivity and productivity of a laminated board, and further improve tackiness after preliminary drying. SOLUTION: A novolak-type epoxy resin having a softening point of 85 ° C. or more is reacted with (meth) acrylic acid, and a hydroxyl group of the obtained epoxy acrylate is reacted with tetrahydromaleic anhydride to have an acid pendant type epoxy acrylate structure. Alternatively, (meth) acrylic acid is reacted with a novolak type epoxy resin having a softening point of 85 ° C. or higher, and tetrahydromaleic anhydride is reacted with the hydroxyl group of the obtained epoxy acrylate to obtain an acid pendant type epoxy acrylate. It has a structure in which glycidyl methacrylate is reacted, and has an acid value of 40 to 10. A photosensitive resin having a weight average molecular weight of 10,000 to 50,000 according to GPC measurement at 0 mgKOH / g; |