Polymer bound antioxidants in which the antioxidant stabilizer groups are chemically bound to polymers or copolymers by an acylaminoimide or diacylhydrazide function are prepared by reacting hydrazido substituted antioxidants with some or all of the anhydride groups of anhydride containing polymers or copolymers to form a polymer with recurring units selected from the formulas
or both wherein the units occur, e.g., in the polymer backbone, x is 0 or 1, R¹ and R² are, e.g., hydrogen and G is, e.g.,
wherein
R³ is t-alkyl of 4-8 carbons,
R⁴ is, e.g., hydrogen and
X¹ is, e.g., -N(R)-C(=O)-(CH₂)b-
wherein
R is e.g., hydrogen and
b is 0, 1 or 2.
The concentration of the stabilizers bound to the polymer may be readily varied depending upon the particular end-use of said polymer. Polymer with high concentrations of bound antioxidants can be used as masterbatches to stabilize other polymer systems.
聚合物结合型
抗氧化剂(其中
抗氧化剂稳定剂基团通过酰
氨基
亚胺或二酰
肼官能团与聚合物或共聚物
化学结合)的制备方法是:将
肼基取代的
抗氧化剂与含酸酐聚合物或共聚物的部分或全部酸酐基团反应,形成具有选自下列公式的重复单元的聚合物: 1.
或两者,其中单元出现在聚合物骨架中,x 为 0 或 1,R¹ 和 R² 为氢,G 为....................、
其中
R³ 是含 4-8 个碳原子的 t-烷基、
R⁴是,例如,氢和
X¹ 例如是-N(R)-C(=O)-(CH₂)b-。
其中
R 是氢和
b 是 0、1 或 2。
与聚合物结合的稳定剂浓度可根据所述聚合物的特定最终用途随时改变。具有高浓度结合
抗氧化剂的聚合物可用作母料来稳定其他聚合物体系。