A 2,2,6,6-tetramethyl-4-piperidinyl derivative having a formula comprising: ##STR1## wherein R.sub.1 is hydrogen, an alkyl or alkylene group having 1 to about 8 carbon atoms, or cycloalkyl or aryl groups having about 5 or 6 ring carbon atoms; R.sub.2 and R.sub.3 are individually selected from hydrogen, alkyl groups having 1 to about 8 carbon atoms, and cycloalkyl and aryl groups having about 5 or 6 ring carbon atoms; R.sub.4 is selected from hydrogen and alkyl groups having 1 to about 8 carbon atoms; and n is either 1 or 2. These compounds are useful as UV light stabilizers in plastics and cosmetics (e.g. sunscreens).
一种具有以下式子的2,2,6,6-四甲基-4-
哌啶基衍
生物:##STR1## 其中,R.sub.1为氢,具有1到约8个碳原子的烷基或烷基烃基,或者具有约5或6个环碳原子的环烷基或芳基基团;R.sub.2和R.sub.3分别选自氢,具有1到约8个碳原子的烷基基团,具有约5或6个环碳原子的环烷基或芳基基团;R.sub.4选自氢和具有1到约8个碳原子的烷基基团;n为1或2。这些化合物在塑料和化妆品(例如防晒霜)中作为紫外线稳定剂非常有用。