| abstract |
Provided is an ultraviolet absorber capable of efficiently absorbing harmful lights in a wavelength region of 380 to 400 nm; and suppressing the absorption of lights having a wavelength of not shorter than 400 nm, which constitutes the cause of yellowing at early stages. The ultraviolet absorber can thus be used to produce a member superior in appearance as being less affected by harmful lights, and has an excellent light resistance, heat resistance and durability accordingly. The highly light-resistant ultraviolet absorber of the present invention is comprised of a 2-phenylbenzotriazole derivative that contains a thioaryl ring group or the like and is represented by, for example, the following formula (1): PhBzT<sup>1a</sup>-S-X<sup>1a</sup>-(R<sup>1a</sup>) (1)wherein PhBzT<sup>1a</sup> represents a substituted or unsubstituted 2-phenylbenzotriazole skeleton bonded to a thioaryl ring group (-S-X<sup>1a</sup>-...), X<sup>1a</sup> represents a residue of a phenyl ring or the like, each of 1R<sup>1a</sup>s independently represents, for example, a hydrocarbon group having 1 to 18 carbon atoms, 1 represents an integer of 0 to 5. |