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 essentially consists of
 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; 
 R 3  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 
         wherein the 1,3,5-triazine content is higher than 1.1 mol 1,3,5-triazine per mol of phosphorus atom and 
       
       c) 0-30 mass % olefin copolymer on the basis of at least one olefin with 2-12 carbon atoms and at least one compound containing acid, acid anhydride or epoxy groups; 
       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  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 1-5 mass % olefin copolymer.   
   
   
       14 . Moulded article containing the flame retardant polyamide composition according to  claim 9 .