| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymer which can be three-dimensionally cured via crosslinking by irradiating with ultraviolet light or the like, and a resin composition comprising the same, where distortions and cracks caused by shrinkage or the like at the time of reaction molding and curing failure on the uppermost surface can be prevented and a substance by photo-induced cross-linking can withstand bending.SOLUTION: A polymer which is a solid at room temperature is obtained by polymerizing a specified epoxy group-containing monomer which has 1 to 3 epoxy groups and 1 radically reactive group in a molecule, combined with tetrahydrofurfuryl methacrylate according to polymerization of the radically reactive group. The polymer has a weight average molecular weight of 50,000-500,000. Curing is performed by irradiating with ultraviolet light or the like according to a three-dimensional cross-linking which comes from a photo-induced cationic polymerization mechanism. After the photo-induced cationic cross-linking, a cured product usable as various durable optical materials which has a glass transition temperature of 60°C or higher can be obtained. |
