There are provided polymer stabilizers having the formula
wherein
A is an organic tetravalent radical of 2 to 48 carbons,
D is a divalent radical -C(=O)-N(G)-C(=O)-(CH₂)x-, where x is 0 or 1,
E is a monovalent radical -(CH₂)x-C(=O)NH-G, where x is 0 or 1,
d is 0, 1 or 2 and
G is the residue of a stabilizer group, e.g., a hydrazido-substituted hindered phenol or a hydrazido-substituted hindered amine light stabilizers
The polymer stabilizers are prepared by the reaction of hydrazido-substituted or certain amino-substituted polymer stabilizers and cyclic dianhydrides. The polymer stabilizers of the invention are useful for protecting a large variety of synthetic polymeric organic materials from the degradative effects of heat, light and oxygen. Some of the modifiers are flame retardants and many more metal deactivators in addition to their primary activity.
聚合物稳定剂的结构式为
其中
A 是 2 至 48 个碳原子的有机四价基、
D 是二价基-C(=O)-N(G)-C(=O)-(CH₂)x-,其中 x 为 0 或 1、
E 是单价基-(CH₂)x-C(=O)NH-G,其中 x 为 0 或 1、
d 是 0、1 或 2,以及
G 是稳定剂基团的残基,如
肼基取代的受阻
酚或
肼基取代的受阻胺
光稳定剂。
通过
肼基取代或某些
氨基取代的聚合物稳定剂与环状二酐反应制备聚合物稳定剂。本发明的聚合物稳定剂可用于保护各种合成高分子有机材料免受热、光和氧的降解作用。其中一些改性剂是阻燃剂,而更多的改性剂除了其主要活性外,还是
金属失活剂。