| 摘要 |
PURPOSE:To obtain the subject composition excellent in the capability of mass production in molding substrates by the photopolymerization method, and can give an optical disc base having high mechanical properties, high recording characteristics and high reliability by giving thereto a specified composition containing a specified trimethacrylate. CONSTITUTION:The objective composition comprises a tri(meth)acrylate of the formula (wherein X is H or CH3; and (n) is 1-10), a polyurethane (meth) acrylate obtained by reacting a polyol with an alicyclic diisocyanate and hydroxy(meth)acrylate [e.g. a polyurethane acrylate obtained by reacting 1mol of polytetramethylene glycol with 2mol of methylenebis(4-cyclohexyl isocyanate) and having a molecular weight of 1200], gamma-(meth)acryloxypropyltrimethoxysilane and a photopolymerization initiator. |
