| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymerization-curable composition giving a cured body exhibiting good photochromic characteristics with high coloring density and quick decoloring rate, further excellent in basic characteristics of the cured body such as hardness, heat resistance and impact resistance, as well as enough strength (toughness) to be used for rimless glasses. SOLUTION: This polymerization-curable composition comprises a mixture containing a specific multifunctional polymerizable monomer having such a hard molecular structure that a polymer obtained by homopolymerization thereof gives≥60 Rockwell hardness in L-scale, and a multifunctional monomer or a multifunctional oligomer having a value (M/v) of dividing its molecular weight (M) by the number (v) of polymerizable groups existing in the molecule of 300 or more, respectively at specific proportions, combined with a photochromic compound and a photopolymerization initiator. COPYRIGHT: (C)2009,JPO&INPIT |
