| 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):PhBzT1a-S—X1a—(R1a)l (1)wherein PhBzT1a represents a substituted or unsubstituted 2-phenylbenzotriazole skeleton bonded to a thioaryl ring group (—S—X1a— . . . ), X1a represents a residue of a phenyl ring or the like, each of l R1as independently represents, for example, a hydrocarbon group having 1 to 18 carbon atoms, l represents an integer of 0 to 5. |