| abstract |
The present invention provides a component with little influence of harmful light and excellent appearance, which can effectively absorb harmful light in the wavelength region of 380 nm to 400 nm and suppress absorption of wavelength light of 400 nm or more, which is a major cause of initial yellowing, and has excellent appearance. Ultraviolet absorber excellent in heat resistance, further light resistance and heat resistance, that is, excellent in durability. The highly lightfast ultraviolet absorber of the present invention contains a 2-phenylbenzotriazole derivative having a thioaryl ring group or the like, such as the following formula (1). In formula (1), PhBzT 1a represents a 2-phenylbenzotriazole skeleton to which a thioaryl ring group (-S-X 1a -...) is bonded with or without a substituent, and X 1a represents benzene Residues such as rings, one R 1a each independently represents a hydrocarbon group having 1 to 18 carbon atoms, etc., and 1 represents an integer of 0 to 5. PhBzT 1a -S-X 1a-(R 1a ) I ( 1 ). |