| abstract |
It has excellent ultraviolet absorption performance in the ultraviolet wavelength region of 300 to 400 nm, especially in the wavelength region of 330 to 400 nm with high integrated energy, which can correspond to the spectral irradiance distribution of the ultraviolet portion of sunlight reaching the ground from the sun, and also has little coloration. Provided is a benzotriazole-based (co)polymer obtained by polymerizing a raw material containing a resorcinol-type benzotriazole-based monomer of the following general formula as a polymer. [Preferably, R 1 and R 2 are H, R 3 is an alkyl group, R 4 is H, an alkyl group, an acryloyloxyalkyl group or a methacryloyloxyalkyl group] |