| 摘要 |
PROBLEM TO BE SOLVED: To produce a composite board excellent in visible ray transmitting property, ultraviolet ray and heat ray shielding property and safety and suitable as a material used for an opening party by forming plural transparent boards and a specific hardened acrylic resin layer filled in a space between the boards. SOLUTION: This composite board is constituted of plural transparent boards, each of which is selected preferably from a glass plate, an acryl plate and a poylcoarbonate plate, and the hardened acrylic resin layer which is filled in the space between the boards and in which an ultraviolet shielding agent (e.g. 2-(2-hydroxy-3,5-di-tert-butyl-phenyl)-5-chloro-benzotrialzoll) and a heat ray shielding agent selected from an Sn doped indium oxide and an Sb doped tin oxide are dissolved or finely dispersed. The heat ray shielding agent is incorporated in the hardened acrylic resin by <=1wt.% to the hardened acrylic resin and is preferably finely dispersed into <=0.1μm average particle size.
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