| 摘要 |
PURPOSE:To provide the title composition having a specific composition, causing no wrinkles, cracks, opacity or yellowing even left to stand for a long time at elevated temperatures and humidity, also affecting no recording film layer, thus capable of giving optical disk substrates enabling high adhesiveness to be maintained. CONSTITUTION:The objective composition comprising (A) pref. 25-35wt.% of an urethane acrylate (pref. from 2-hydroxypropyl acrylate and hexamethylene diisocyanate), (B) pref. 30-70wt.% of neopentyl glycol-modified trimethylolpropane diacrylate, (C) pref. 30-70wt.% of hydroxypivalic neopentyl glycol diacrylate and/or neopentyl glycol diacrylate, and (D) pref. 1-5wt.% of a photopolymerization initiator (e.g. 2-hydroxy-2-methyl-1-phenylpropan-1-one). |
