Sterically hindered amines

Abstract

A compound of the formula (A) wherein the radicals R 1 are independently of one another methyl, ethyl or n-propyl, and X is C 2 -C 8 alkylene or C 2 -C 8 alkylene interrupted by sulfur, is useful for stabilizing an organic material against degradation induced by light, heat or oxidation.

1 . A compound of the formula (A) 
       
         
           
           
               
               
           
         
       
       wherein the radicals R 1  are independently of one another methyl, ethyl or n-propyl, and X is C 2 -C 8 alkylene or C 2 -C 8 alkylene Interrupted by sulfur. 
     
     
         2 . The compound according to  claim 1 , wherein X is —(CH 2 ) 2 —, —(CH 2 ) 8 —, —CH 2 —S—CH 2 — or —(CH 2 ) 2 —S—(CH 2 ) 2 —. 
     
     
         3 . The compound according to  claim 1 , wherein R 1  is n-propyl. 
     
     
         4 . The compound according to  claim 1 , which corresponds to 
       
         
           
           
               
               
           
         
       
     
     
         5 . A composition containing
 a) an organic material and   b) a compound of the formula (A) as defined in  claim 1 .   
     
     
         6 . A composition according to  claim 5 , wherein the organic material is a polyolefin homo- or copolymer. 
     
     
         7 . A composition according to  claim 5 , which additionally contains a conventional additive. 
     
     
         8 . A method for stabilizing an organic material against degradation induced by light, heat or oxidation, which comprises incorporating a compound of the formula (A) as defined in  claim 1  into the organic material. 
     
     
         9 . The use of a compound of the formula (A) as defined in  claim 1  for stabilizing an organic material against thermal, oxidative or light induced degradation.