| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin cured product having a high surface hardness and exhibits high adhesion to a substrate and low warpage and high flexing resistance as a shaped article, and a key sheet having a layer composed of the resin cured product. SOLUTION: The resin cured product has a Martens hardness within the range from at least 30 N/mm<SP>2</SP>to at most 170 N/mm<SP>2</SP>as measured by a micro-indentation test and an elastic deformation rate of at most 60%. The key sheet has a layer composed of the resin cured product. Preferably in particular, the resin cured product is obtained by hardening, by cast polymerization, an active energy ray-curable resin composition that includes 100 pts.mass of the total of 25-75 pts.mass of a urethane (meth)acrylate (A) obtained by a reaction among a polyisocyanate (a1), a polyol (a2) and a hydroxyalkyl (meth)acrylate (a3) and 25-75 pts.mass of a cyclic structure-containing monofunctional monomer (B) whose homopolymer has a Tg of 100°C or higher and an active energy ray-curable polymerization initiator (C). COPYRIGHT: (C)2010,JPO&INPIT
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