| abstract |
Provided is a UV absorbent that has excellent light resistance or heat resistance, and excellent light resistance and heat resistance, i.e., durability, and that efficiently absorbs hazardous light in a wavelength region of 380-400 nm and inhibits absorption of light which has a wavelength of 400 nm or more and causes early yellowing, and therefore can be used to obtain a member that is less affected by hazardous light and has excellent appearance. The highly light-resistant UV absorbent according to the present invention comprises a 2-phenylbenzotriazole derivative represented by formula (1) or the like and having a thioaryl ring group or the like. (In the formula, PhBzT 1a may be an optionally substituted 2-phenylbenzotriazole backbone to which a thioaryl ring group (-S-X 1a -…) is linked, X 1a represents a residue such as a phenyl group, each occurrence of R 1a independently represents a hydrocarbon group having 1-18 carbon atoms or the like, and l represents an integer of 0-5.) |