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.
- Naoki Hayashi
- Akira Koshiji
