申请人:American Cyanamid Company
公开号:US03972927A1
公开(公告)日:1976-08-03
Compounds of the formula: ##SPC1## Wherein R.sub.1 and R.sub.2 are each branch-chain alkyl of 3 to 8 carbon atoms and R.sub.3 and R.sub.4 are each hydrogen, alkyl of 1 to 18 carbon atoms, or cycloalkyl of 5 or 6 carbon atoms are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-di-alkyl-4-hydroxybenzoyl chloride with the appropriate amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate amine in the presence of a carbodiimide as dehydrating agent.
化合物的公式:##SPC1## 其中R.sub.1和R.sub.2各自是3到8个碳原子的支链烷基,R.sub.3和R.sub.4各自是氢,1到18个碳原子的烷基或5或6个碳原子的环烷基,在聚烯烃中作为光稳定剂是有用的。它们可以通过以下方法制备:(a)在酸受体的存在下,将3,5-二烷基-4-羟基苯甲酰氯与适当的胺反应;或者(b)在脲类去水剂的存在下,将相应的苯甲酸与适当的胺反应。