| abstract |
By effectively absorbing harmful light in the wavelength range from 380 to 400 nm and suppressing absorption of light having a wavelength of 400 nm or more, which is a factor of yellowing in the initial stage, a member with little influence of harmful light and excellent appearance can be obtained, and light resistance Alternatively, an ultraviolet absorber having excellent heat resistance and excellent light resistance and heat resistance, that is, durability. The high light resistance ultraviolet absorber of the present invention comprises a 2-phenylbenzotriazole derivative having a thioaryl ring group, such as the following formula (1). (Wherein, PhBzT 1a which may have a substituent thioaryl ventilation (-SX 1a - ...) is 2-phenyl benzotriazole skeleton represents a sol bound, X 1a denotes a residue of a phenyl ring, l of R 1a is Each independently represents a hydrocarbon group having 1 to 18 carbon atoms, and l represents an integer of 0 to 5) |