Halogen-free flame retarder composition and flame retardant polyamide composition

Abstract

The invention relates to a halogen-free, flame retarder composition for use in a thermoplastic composition, in particular a glassfibre-reinforced polyamide composition, which flame retarder composition contains at least 10-90 mass % phosphinate compound according to formula (I) and/or formula (II) and/or polymers thereof and 90-10 mass % polyphosphate salt of a 1,3,5-triazine compound according to formula (III) and 0-30 mass % olefin copolymer. When used as a flame retarder in glassfibre-reinforced compositions the halogen-free flame retardant composition results in a combination of a V-0 rating according to the UL 94 test of Underwriters Laboratories and excellent mechanical properties. The invention therefore also relates to the use of this flame retarder composition as a flame retarder in a polyamide composition, and a flame retardant polyamide composition that contains the flame retarder composition. The invention also relates to a moulded article containing the flame retardant polyamide composition, and the use thereof in the field of electrical and electronic applications.

1 . Halogen-free, flame retarder composition for use in a thermoplastic composition, which flame retarder composition contains at least 
 a) 10-90 mass % phosphinate compound according to formula (I) and/or formula (II) and/or polymers thereof;                           in which 
 R 1 , R 2  is hydrogen, a linear or branched C1-C6 alkyl radical, or a phenyl radical;  
 R3 is a linear or branched C1-C10 alkylene, arylene, alkylarylene, or arylalkylene radical;  
 M is an alkaline earth metal or alkali metal, Al, Zn, Fe, or a 1,3,5-triazine compound;  
 m is 1, 2or 3;  
 n is 1 or 3;  
 x is 1 or 2; and  
   b) 90-10 mass % polyphosphate salt of a 1,3,5-triazine compound according to formula (III),                        in which T represents a 1,3,5-triazine compound; and    n is a measure of the number average degree of condensation and is higher than 3; and      c) 0-30 mass % olefin copolymer;    the sum of components a)-c) being 100%.    
     
     
         2 . Flame retarder composition according to  claim 1 , wherein n in the polyphosphate salt of a 1,3,5-triazine compound is higher than 20.  
     
     
         3 . Flame retarder composition according to  claim 1 , wherein the 1,3,5-triazine compound in the polyphosphate salt of a 1,3,5-triazine compound is melamine.  
     
     
         4 . Flame retarder composition according to  claim 1 , wherein the composition contains 25-75 mass % phosphinate compound and 75-25 mass % polyphosphate salt of a 1,3,5-triazine compound.  
     
     
         5 . Flame retarder composition according to  claim 1 , wherein R 1  and R 2  in the phosphinate compound are a linear or branched C1-C6 alkyl radical.  
     
     
         6 . Flame retarder composition according to  claim 1 , wherein M in the phosphinate compound is Ca, Al or Zn.  
     
     
         7 . Flame retarder composition according to  claim 1 , wherein M in the phosphinate compound is Zn.  
     
     
         8 . Flame retarder composition according to claims  1 , wherein the composition contains 1-30 mass % olefin copolymer.  
     
     
         9 . Flame retardant polyamide composition that contains the following components: 
 a) 95-10 mass % polyamide;    b) 0-50 mass % glass fibre;    c) 5-40 mass % flame retarder composition according to any one of  claim 1;     d) 0-50 mass % other additives; 
 the sum of components a)-d) being 100 mass %.  
   
     
     
         10 . Flame retardant polyamide composition according to  claim 9 , wherein the polyamide composition contains 10-40 mass % glass fibre.  
     
     
         11 . Flame retardant polyamide composition according to  claim 9 , wherein the polyamide composition contains 10-35 mass % flame retardant composition.  
     
     
         12 . Flame retardant polyamide composition according to  claim 9 , wherein the polyamide is polyamide 6.  
     
     
         13 . Flame retardant polyamide composition according to  claim 9 , wherein the polyamide composition contains the flame retarder composition 
 a) 10-90 mass % phosphinate compound according to formula (I) and/or formula (II) and/or polymers thereof;                           in which 
 R 1 , R 2  is hydrogen, a linear or branched C1-C6 alkyl radical, or a phenyl radical;  
 R3 is a linear or branched C1-C10 alkylene, arylene, alkylarylene, or arylalkylene radical;  
 M is an alkaline earth metal or alkali metal, Al, Zn, Fe, or a 1,3,5-triazine compound;  
 m is 1, 2 or 3;  
 n is 1 or 3;  
 x is 1 or 2; and  
   b) 90-10 mass % polyphosphate salt of a 1,3,5-triazine compound according to formula (III),                        in which T represents a 1,3,5-triazine compound; and    n is a measure of the number average degree of condensation and is higher than 3; and      c) 0-30 mass % olefin copolymer; 
 in which the olefin copolymer is a maleic anhydride-modified ethylene/alpha-olefin copolymer and the sum of components a)-c) being 100%.  
   
     
     
         14 . Flame retardant polyamide composition according to  claim 13 , wherein the polyamide composition contains 1-5 mass % olefin copolymer.  
     
     
         15 . Moulded article containing the flame retardant polyamide composition according to  claim 9 .  
     
     
         16 . Halogen-free flame retardant composition for use in a thermoplastic composition, which flame retardant composition contains at least 
 a) 10-90 mass % phosphinate compound according to formula (I) and/or formula (II) and/or polymers thereof as defined in  claim 1;     b) 90-10 mass % polyphosphate salt of a 1,3,5-triazine compound according to formula (III) according to  claim 1  in which the 1,3,5-triazine content is higher than 1.1 mol per mol of phosphorus atom;    and    c) 0-30 mass % olefin copolymer;    the sum of components a)-c) being 100%.    
     
     
         17 . Flame retardant polyamide compositions comprising: 
 a) 95-10 mass % polyamide;    b) 0-50 mass % glass fiber;    c) 5-40 mass % flame retardant composition according to  claim 16;     and    d) 0-50 mass % other additives; the sum of components a)-d) being 100 mass %.