申请人:Miyoshi Oil & Fat Co., Ltd.
公开号:EP3904443A1
公开(公告)日:2021-11-03
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) (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 1R1as independently represents, for example, a hydrocarbon group having 1 to 18 carbon atoms, 1 represents an integer of 0 to 5.
本发明提供了一种紫外线吸收剂,它能够有效吸收波长在 380 至 400 纳米之间的有害光,并抑制对波长不短于 400 纳米的光的吸收,而这些光是导致早期黄变的原因。因此,紫外线吸收剂可用于生产受有害光影响较小的外观优异的构件,并相应地具有出色的耐光性、耐热性和耐用性。本发明的高耐光性紫外线吸收剂由 2-苯基苯并三唑衍生物组成,该衍生物含有硫代芳基环基或类似基团,例如由下式(1)表示:
PhBzT1a-S-X1a-(R1a) (1)
其中 PhBzT1a 代表与硫代芳基环基(-S-X1a-......)键合的取代或未取代的 2-苯基苯并三唑骨架,X1a 代表苯基环或类似物的残基,1R1as 各自独立地代表例如具有 1 至 18 个碳原子的烃基,1 代表 0 至 5 的整数。