| abstract |
Provided is a benzotriazole compound that efficiently absorbs UV rays having a long wavelength of 360-400 nm, and either i) has excellent solubility in a monomer of a resin raw material and can dissolve at a high concentration, polymerizes at excellent reactivity, and yields a high-molecular-weight resin member and furthermore a transparent resin member, or ii) has exceptional heat resistance. This benzotriazole compound is represented by formula (I), where at least one of R 1 -R 9 is represented by formula (i-1), (where R 10 and R 11 are hydrocarbon groups, etc., and R 12 is represented by formula (i-2) or formula (i-3) (in formula (i-2), A 1 represents a divalent group selected from nitrogen-containing groups, oxygen-containing groups, sulfur-containing groups, phosphorus-containing groups, and phenylene groups, and R 12a -R 12c and X represent hydrocarbon groups, etc.; and in formula (i-3), A 2 represents a divalent group selected from nitrogen-containing groups, oxygen-containing groups, sulfur-containing groups, and phosphorus-containing groups, and X a and X b represent hydrocarbon groups, etc.)). |