| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymerization-curable composition giving a cured product which has a high luminous concentration and a large discoloring rate, exhibits a good photochromic characteristic, has excellent substrate characteristics such as excellent hardness, heat resistance, and impact resistance, and simultaneously has such a hardness (toughness) as capable of being also used for rim-less spectacles. SOLUTION: This polymerization-curable composition comprises the mixture of a specific multi-functional polymerizable monomer having such a hard molecular structure as giving a polymer having a L scale Rockwell hardness of≥60, when singly polymerized, with a multi-functional polymerizable monomer or multi-functional polymerizable oligomer having a value (M/v) of≥300 obtained by diving the mol. wt. (M) by the number (v) of the polymerizable groups existing in the molecule, in specific amounts, respectively, a photochromic compound, and a photopolymerization initiator. COPYRIGHT: (C)2005,JPO&NCIPI
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