To realize thermoplastic near-infrared-absorbing resin materials with weak absorbance in the visible region, the solubility of thermostable alkyl phosphate ester copper complexes in poly(alkyl methacrylate) has been investigated for their use as near-infrared-absorbing dyes. C4–C12 alkyl phosphate ester copper complexes were synthesized and mixed with n -butyl methacrylate, 2-ethylhexyl methacrylate, and lauryl methacrylate at 0.10 mol/g copper ion in the monomer solution. The obtained solutions were polymerized to prepare 3 mm resin plates, and the plate transparency was evaluated by a haze meter. 2-Ethylhexyl methacrylate solutions of the 2-ethylhexyl phosphate copper complex and the isodecyl phosphate copper complex maintained their transparency even after polymerization, so these two copper complexes show good solubility in poly(2-ethylhexyl methacrylate). Both of the resin plates have >80% visible light transmittance and <50% solar direct transmittance. Thus, these resin materials are suitable as window materials that require heat-shielding properties and transparency. The solubility of thermostable alkyl phosphate ester copper complexes in poly(alkyl methacrylate) has been investigated for use as near-infrared-absorbing dyes. 2-Ethylhexyl methacrylate solutions of the 2-ethylhexyl phosphate copper complex and isodecyl phosphate copper complex maintained their transparency even after polymerization, so these two copper complexes show good solubility in poly(2-ethylhexyl methacrylate). Both of the resin plates have visible light transmittance of above 80% and solar direct transmittance of below 50% from spectral transmission. Thus, these resin materials are suitable for window materials that require heat-shielding properties and transparency.

中文翻译：

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热稳定的烷基磷酸酯铜配合物在聚（甲基丙烯酸烷基酯）中的近红外吸收染料溶解度

为了实现在可见光区具有弱吸收性的热塑性近红外吸收树脂材料，研究了耐热烷基磷酸酯铜配合物在聚甲基丙烯酸烷基酯中的溶解性，以用作近红外吸收染料。合成了 C4-C12 烷基磷酸酯铜配合物，并在单体溶液中以 0.10 mol/g 铜离子与甲基丙烯酸正丁酯、甲基丙烯酸 2-乙基己酯和甲基丙烯酸月桂酯混合。将所得溶液聚合制备3mm树脂板，并通过雾度计评价板透明度。2-乙基己基磷酸铜络合物和异癸基磷酸铜络合物的甲基丙烯酸 2-乙基己酯溶液即使在聚合后仍保持其透明度，因此这两种铜配合物在聚（甲基丙烯酸2-乙基己酯）中显示出良好的溶解性。两种树脂板均具有>80%的可见光透射率和<50%的太阳光直接透射率。因此，这些树脂材料适合作为需要隔热性和透明性的窗材料。热稳定的烷基磷酸酯铜配合物在聚（甲基丙烯酸烷基酯）中的溶解度已被研究用作近红外吸收染料。2-乙基己基磷酸铜配合物和异癸基磷酸铜配合物的甲基丙烯酸2-乙基己酯溶液即使在聚合后仍保持透明，因此这两种铜配合物在聚甲基丙烯酸2-乙基己酯中显示出良好的溶解性。两种树脂板的可见光透过率均在80%以上，太阳直射透过率均低于50%。因此，这些树脂材料适用于需要隔热性和透明性的窗材料。