The invention relates to new piperidine compounds which act as light stabilisers, heat stabilisers and oxidation stabilisers for synthetic polymers, in particular for hydrocarbon polymers. The compounds are piperidinol carbamates of the formula: ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and A have the meanings defined in the description and y is an integer from 1 to 4. In particular, A represents a monovalent to tetravalent radical, always bonded to the carboxy-piperidine radicals via nitrogen atoms.
本发明涉及新的
哌啶化合物,其作为合成聚合物的
光稳定剂、热稳定剂和氧化稳定剂,特别是对碳氢聚合物。该化合物是公式的
哌啶醇
氨基甲酸酯: ##STR1## 其中R.sub.1,R.sub.2,R.sub.3,R.sub.4,R.sub.5,R.sub.6,R.sub.7和A在说明中定义其含义,y是1到4的整数。特别地,A表示一价到四价的基团,始终通过氮原子与羧基
哌啶基团结合。