| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly durable sealing material for ultraviolet (UV) to blue light elements without yellowing even by exposure to UV light and capable of overcoming short-life due to yellow discoloration. SOLUTION: The sealing material for optical elements are substituent-containing silsesquioxanes with a ladder or a cage structure or their partially cleaved structures (structures with a partially deleted silicon atom or a partially cleaved silicon-oxygen bonding in the cage structure) having at least two functional groups selected from the group consisting of an aliphatic unsaturated binding group, an epoxy ring and an optionally substituted silyl group having an Si-H bond. COPYRIGHT: (C)2005,JPO&NCIPI
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