| 摘要 |
<p>A polymerization curable composition which comprises a specific polyfunctionally polymerizable monomer having a molecular structure affording a polymer having a L scale Rockwell's hardness of 60 or more by homopolymerization, an another specific polyfunctionally polymerizable monomer and a photochromic compound; a base material for a photochromic lens comprising the cured product from the composition; and a lens using the base material. The base material and the lens exhibit a high coloring density, a high color disappearance rate and good photochromic characteristics, and are excellent in characteristics of the base material such as hardness, heat resistance and impact resistance of a cured product, and further has such a strength (toughness) sufficient for use in a rimless spectacle.</p> |
