Compounds of formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each 2-ethylhexyl or are independently higher alkyl, or R.sub.1 and R.sub.2 are independently hydrogen or methyl, and R.sub.3 and R.sub.4 are independently higher alkyl are effective processing stabilizers for polymers processed at elevated temperatures by preventing polymer degradation and providing resistance to discoloration. The compounds of formula I also exhibit superior hydrolytic stability and resist moisture pickup on storage.
化学式为I的化合物
其中R.sub.1,R.sub.2,R.sub.3和R.sub.4分别为2-乙基己基或独立的较高烷基,或R.sub.1和R.sub.2分别为氢或甲基,R.sub.3和R.sub.4分别为独立的较高烷基,可有效地用于高温加工的聚合物的加工稳定剂,通过防止聚合物降解并提供抵抗变色性能。
化学式I的化合物还表现出优异的
水解稳定性和在储存过程中抵抗吸湿。