| 摘要 |
PURPOSE: To obtain an optical sheet markedly enhanced in the resistance against an aromatic hydrocarbon solvent, a ketone type solvent and a halogen-containing solvent and still more enhanced in heat resistance and surface hardness while keeping the beneficial points of a norbornene resin. CONSTITUTION: An optical sheet is composed of a norbornene resin film crosslinked by an internal or external crosslinking means, especially, a cast film of a compsn. wherein the wt. ratio of a norbornene resin and a crosslinking agent is 99:1-50:50. The crosslinking agent is pref. org. peroxide. |
