Abstract
The light stabilities of a near-infrared (NIR)-absorbing 2-ethylhexyl phosphate copper complex (EHPC) and resin plates of polymethacrylates containing EHPC were investigated. Light stability was assessed using the ISO 4892 weathering test and a xenon weather meter. EHPC showed high light stability in methyl isobutyl ketone solution. The plate of poly (2-ethylhexyl methacrylate) containing EHPC maintained almost constant transmittance even after irradiation for 1000 h. A resin plate containing poly (dicyclopentanyl methacrylate) as the polymer matrix had a glass transition temperature exceeding 100 °C, which further improved the light stability of the NIR absorption of the copper complex in a resin plate. We developed NIR-absorbing resins with excellent light resistance that are attractive for use as window materials.
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