Stabilization of organic materials

Abstract

The invention describes novel mixtures comprising i) a processing stabilizer selected from the group consisting of hydroxylamine stabilizers, nitrone stabilizers, benzofuran-2-one stabilizers and/or a compound of the formula I R 2 is C 7 -C 30 alkyl, R 3 is C 1 -C 30 alkyl, and ii) an antistatic agent selected from the group consisting of an ethoxylated amine and/or an ethoxylated amide, as stabilizers for protecting organic materials, in particular synthetic polymers, against oxidative, thermal or light-induced degradation.

1 . A mixture comprising
 i) a processing stabilizer selected from the group consisting of hydroxylamine stabilizers, nitrone stabilizers and benzofuran-2-one stabilizers and   ii) an antistatic agent selected from the group consisting of an ethoxylated amine and an ethoxylated amide.   
     
     
         2 . A mixture according to  claim 1 , comprising further additives selected from the group consisting of phenolic antioxidants, further processing stabilizers, light-stabilizers and acid scavengers. 
     
     
         3 . A mixture according to  claim 1 , further comprising (iii) a phosphite, a phosphonite or a triarylphosphine. 
     
     
         4 . A mixture according to  claim 3 , wherein component (iii) is tris(2,4-di-tert-butylphenyl)phosphite, bis(2,4-di-tert-butyl-6-methylphenyl)ethyl phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, tris(nonylphenyl) phosphite or tetrakis(2,4-di-tert-butylphenyl)4,4′-biphenylene diphosphonite. 
     
     
         5 . A mixture according to  claim 1 , wherein component (i) is a hydroxylamine stabilizer of formula II 
       
         
           
           
               
               
           
         
         wherein R 4  and R 5  are each independently of the other C 8 -C 18 alkyl. 
       
     
     
         6 . A mixture according to  claim 1 , wherein component (i) is a N,N-di(alkyl)-hydroxylamine produced by the direct oxidation of N,N-di(hydrogenated tallow)amine. 
     
     
         7 . A mixture according to  claim 1 , wherein component (i) is a nitrone stabilizer of formula III 
       
         
           
           
               
               
           
         
         wherein 
         T is C 8 -C 18 alkyl, 
         G is hydrogen, methyl or ethyl, and 
         E is C 5 -C 17 alkyl. 
       
     
     
         8 . A mixture according to  claim 1 , wherein component (i) is a benzofuran-2-one stabilizer of formula IV 
       
         
           
           
               
               
           
         
         wherein 
         R 9  is hydrogen or C 1 -C 8 alkyl, 
         R 10  is C 1 -C 12 alkyl, 
         R 11  is hydrogen, C 1 -C 4 alkyl or C 2 -C 8 alkanoyl, 
         R 12  is hydrogen or C 1 -C 8 alkyl, 
         R 13  is hydrogen, C 1 -C 4 alkyl or C 1 -C 4 alkoxy, and 
         R 14  is hydrogen or C 1 -C 12 alkyl. 
       
     
     
         9 . A mixture according to  claim 1 , comprising as component (ii) a compound of the formula V 
       
         
           
           
               
               
           
         
         wherein, when m is 1, 
         R 6  is C 4 -C 24 alkyl, C 4 -C 24 alkanoyl, C 4 -C 24 alkenyl, C 4 -C 24 alkenoyl, phenyl or benzoyl, and 
         when m is 2, 
         R 6  is C 1 -C 24 alkylene, C 4 -C 24 alkenylene or phenylene, 
         R 7  is hydrogen, C 1 -C 24 alkyl or 
       
       
         
           
           
               
               
           
         
         R 8    
       
       
         
           
           
               
               
           
         
         m is 1 or 2, and 
         n is 1, 2, 3, 4 or 5. 
       
     
     
         10 . A mixture according to  claim 9 , wherein
 R 6  is C 11 -C 20 alkyl or C 11 -C 20 alkanoyl,   R 7  is hydrogen or   
       
         
           
           
               
               
           
         
         R 8  is 
       
       
         
           
           
               
               
           
         
         m is 1, and 
         n is 1 or 2. 
       
     
     
         11 . A mixture according to  claim 1 , wherein component (i) is a N,N-di(alkyl)-hydroxylamine produced by the direct oxidation of N,N-di(hydrogenated tallow)amine, and component (ii) is a C 13 -C 18 -alkyl-diethanolamine. 
     
     
         12 . A mixture according to  claim 1 , wherein component (ii) is a C 13 -C 18 -alkyl-diethanolamine. 
     
     
         13 . A composition comprising
 a) an organic material which is susceptible to oxidative, thermal or light-induced degradation, and   b) a mixture of components (i) and (ii) according to  claim 1 .   
     
     
         14 . A composition according to  claim 13 , wherein component (a) is a synthetic polymer. 
     
     
         15 . A composition according to  claim 13 , wherein component (a) is a polyolefin. 
     
     
         16 . A composition according to  claim 13 , wherein component (a) is polyethylene or polypropylene or a mixture thereof. 
     
     
         17 . A composition according to  claim 13 , wherein component (b) is present in an amount of from 0.001 to 5%, based on the weight of component (a). 
     
     
         18 . A shaped article containing a mixture according to  claim 1 . 
     
     
         19 . A process for stabilizing an organic material against oxidative, thermal or light-induced degradation, which comprises incorporating therein or applying thereto at least a mixture according to  claim 1 .