| 摘要 |
PURPOSE:To improve tenting property by reducing oxygen from a through hole using the photosensitive layer of a photosensitive element. CONSTITUTION:A photosensitive liquid is formed by compounding a methyl methacrylate/acrylic acid copolymer, trimethylolpropane triacrylate, tetraethyleneglycol diacrylate, 2,6-bis(p-diethylamino)-benzylidene-4-methyl- azacyclohexane, N-phenylglycine, diphenylacetic acid, hydroquinone and acetone. A photosensitive element is obtained by forming a photosensitive layer which is obtained by applying the above-mentioned photosensitive liquid on polyethylene terephthalate and by drying it up. Besides, a polyethylene film of 25mum is pressure-laminated thereon. Then, the above-mentioned photosensitive element is laminated on both-face-copper-clad laminated plate, having a through hole, under the following condition, the degree of vacuum: 60mmHg, the lamination speed: 1m/min. After the above-mentioned material has been left in atmospheric air of 22 deg.C for two hours, it is exposed and a developing treatment is conducted by spraying a sodium carbonate aqueous solution. |
