Sterically hindered amines

Abstract

An intermediate of the formula (I) wherein the radicals R 1 are independently of one another methyl, ethyl or n-propyl, is suitable for preparing a compound of the formula (A) wherein X is a group of the formula (A-I) or (A-II), Y is C 11 -C 17 alkyl, and Z is a direct bond, —(CH 2 ) 8 — or —CH 2 —S—CH 2 —. The compounds of the formula (A) are useful for stabilizing an organic material against thermal, oxidative or light induced degradation.

1 . An intermediate of formula (I) 
       
         
           
           
               
               
           
         
         wherein the radicals R 1  are independently of one another methyl, ethyl or n-propyl. 
       
     
     
         2 . The intermediate according to  claim 1 , wherein R 1  is n-propyl. 
     
     
         3 . A process for the preparation of an intermediate of formula (I) 
       
         
           
           
               
               
           
         
         wherein R 1  is methyl, ethyl or n-propyl; 
         which comprises reacting a compound of formula (I-a) 
       
       
         
           
           
               
               
           
         
         with ammonia in an organic solvent in the presence of hydrogen and platinum as hydrogenation catalyst. 
       
     
     
         4 . The process according to  claim 3 , wherein the organic solvent is a C 1 -C 4 alcohol or a (C 1 -C 4 alkyl) ester and the reaction is carried out under a hydrogen pressure of 1 to 60 bar and at a temperature of 20° to 120° C. 
     
     
         5 . The process according to  claim 3 , wherein the molar ratio of ammonia to the compound of the formula (I-a) is 0.5/2 to 1.3/2. 
     
     
         6 . A compound of formula (A) 
       
         
           
           
               
               
           
         
         wherein X is a group of formula (A-I) or (A-II), 
       
       
         
           
           
               
               
           
         
         where 
         Y is C 11 -C 17 alkyl, 
         Z is a direct bond, —(CH 2 ) 8 — or —CH 2 —S—CH 2 —, and 
         the radicals R 1  are independently of one another methyl, ethyl or n-propyl. 
       
     
     
         7 . The compound according to  claim 6 , wherein X is a group of the formula (A-I). 
     
     
         8 . The compound according to  claim 6 , wherein X is a group of the formula (A-II). 
     
     
         9 . The compound according to  claim 6 , wherein R 1  is n-propyl. 
     
     
         10 . The compound according to  claim 6 , which corresponds to 
       
         
           
           
               
               
           
         
       
     
     
         11 . A composition containing
 a) an organic material and   b) a compound of the formula (A) as defined in  claim 6 .   
     
     
         12 . A composition according to  claim 11 , wherein the organic material is a polyolefin homo- or copolymer. 
     
     
         13 . A composition according to  claim 11 , which additionally contains a conventional additive. 
     
     
         14 . 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 6  into the organic material.