Ultraviolet light stabilizers are chemically bound to anhydride containing polymers or copolymers. The polymeric stabilizers are prepared by the reaction of primary amino or hydrazido-substituted UV absorbers with some or all of the anhydride groups of the polymer or copolymer to form polymers with recurring units selected from the formulas
or
or both in which the units occur, e.g., in the polymer backbone and wherein x is 0 or 1, R1 and R2 are, e.g., hydrogen or phenyl and G is, e.g.,
wherein R3 and R4 are, e.g., hydrogen or R3 or R4 is a connecting group X1 which is, e.g., a direct bond. The polymer bound stabilizers are not lost from the polymer system by volatilization, migration, or extraction, even at high temperature. The polymer of this invention may be used as they are or as concentrates to stabilize other polymer systems.
紫外线稳定剂与含有酸酐的聚合物或共聚物进行
化学结合。聚合物稳定剂的制备方法是:伯
氨基或
肼基取代的
紫外线吸收剂与聚合物或共聚物的部分或全部酸酐基团反应,形成具有选自以下公式的重复单元的聚合物
或
或两者,其中单元出现在聚合物骨架中,其中 x 为 0 或 1,R1 和 R2 为氢或苯基,G 为......等、
其中 R3 和 R4 是氢或 R3 或 R4 是连接基团 X1,X1 是直接键。即使在高温下,与聚合物结合的稳定剂也不会因挥发、迁移或萃取而从聚合物体系中流失。本发明的聚合物可以直接使用,也可以作为浓缩物用于稳定其他聚合物体系。