Stabilizer mixture

Abstract

Suitable stabilizers for organic material are a mixture comprising A. at least one oligomeric compound, comprising repeat units of the formula (I), in which the meanings of the symbols are as follows: R 1 is hydrogen, C 1 -C 6 -alkyl, formyl, C 2 -C 6 -alkanoyl, C 1 -C 12 -alkoxy, C 5 -C 6 -cycloalkoxy, cyanomethyl, 2-hydroxyethyl, benzyl or a radical of the formula —CR′═CH—CO—OR″, where R′ is hydrogen, C 1 -C 6 -alkyl or a radical of the formula —CO—OR″, and R″ is C 1 -C 18 -alkyl, C 5 -C 8 -cycloalkyl, C 7 -C 18 -aralkyl, phenyl, or tolyl; R 2 is a mixture composed of C 14 -C 28 -alkyl groups, where two of these alkyl groups whose number of carbon atoms is not permitted to differ by more than two respectively make up at least 30% of this mixture; R 3 and R 4 , independently of one another, are C 1 -C 6 -alkyl; and B. at least one compound of the formula (II) or (III) where the meanings of the symbols and indices are as follows: n and m, independently of one another, are a natural number from 2 to 22, and R 1 , R 3 and R 4 , independently of one another, have the meanings given in formula (I).

1 : A mixture, comprising
 (A) at least one oligomeric compound, comprising repeat units of the formula (I),   
     
       
         
         
             
             
         
       
       in which the meanings of the symbols are as follows: 
       R 1  is hydrogen, C 1 -C 6 -alkyl, formyl, C 2 -C 6 -alkanoyl, C 1 -C 12 -alkoxy, C 5 -C 6 -cycloalkoxy, cyanomethyl, 2-hydroxyethyl, benzyl or a radical of the formula —CR′═CH—CO—OR″, where 
       R′ is hydrogen, C 1 -C 6 -alkyl or a radical of the formula —CO—OR″, and 
       R″ is C 1 -C 18 -alkyl, C 5 -C 8 -cycloalkyl, C 7 -C 18 -aralkyl, phenyl, or tolyl; 
       R 2  is a mixture composed of C 14 -C 28 -alkyl groups, where two of these alkyl groups whose number of carbon atoms is not permitted to differ by more than two respectively make up at least 30% of this mixture; 
       R 3  and R 4 , independently of one another, are C 1 -C 6 -alkyl; 
       and 
       (B) at least one compound of the formula (II) or (III) 
     
     
       
         
         
             
             
         
       
       where the meanings of the symbols and indices are as follows: 
       n and m, independently of one another, are a natural number from 2 to 22, 
       and 
       R′, R 3  and R 4 , independently of one another, have the meanings given in formula (I). 
     
   
   
       2 : The mixture according to  claim 1 , where the meanings of the symbols and indices in the formulae (I) to (III) are as follows:
 R′ is H, C 1 -C 6 -alkyl, formyl, acyl, C 1 -C 6 -alkyl or benzyl;   R 2  is a mixture composed of C 6 -C 24 -alkyl groups;   R 3  and R 4  are methyl, and   m and n are a natural number from 6 to 8.   
   
   
       3 : The mixture according to  claim 1 , where component A is an oligomer of the formula (Ia) 
     
       
         
         
             
             
         
       
       and component B is selected from the group consisting of (IIa), (IIIa), and (IIIb): 
     
     
       
         
         
             
             
         
       
     
   
   
       4 : A process for preparation of a mixture according to  claim 1 , comprising:
 a) adding component (B) to a melt of component (A) to form a mixture,   b) homogenizing the mixture to form a homogenized mixture, and)   c) converting the homogenized mixture to a desired form and allowing said mixture to cool.   
   
   
       5 : An organic material stabilized with respect to exposure to light, oxygen, and heat, comprising from 0.01 to 5% by weight, based on the amount of the organic material, of a mixture according to  claim 1 . 
   
   
       6 : A plastic or paint stabilized with respect to exposure to light, oxygen, and heat, comprising from 0.01 to 5% by weight, based on the amount of the plastic and, respectively, paint, of a mixture according to  claim 1 . 
   
   
       7 - 8 . (canceled) 
   
   
       9 : A method for stabilization of organic material with respect to exposure to light, oxygen, and heat, which comprises admixing into the organic material a mixture according to  claim 1 . 
   
   
       10 . A method for stabilization of plastics and paints with respect to exposure to light, oxygen, and heat, which comprises admixing into the plastic or paint a mixture according to  claim 1 .