Layered silicate flame retardant compositions

Abstract

The invention relates to flame retardant compositions that contain mixtures of melamine polyphosphates with layered silicates added to the polymer substrates, particularly polyamides.

1 . A composition, which comprises
 a) At least one polyphosphate salt of a 1,3,5-triazine compound of the formula (I)   
       
         
           
           
               
               
           
         
         Wherein T represents a 1,3,5-triazine compound and 
         p represents a numeral greater than 3; 
         b) At least one natural or synthetic phyllosilicate or a mixture thereof; 
         c) A polymer substrate and 
         d) Phenolic antioxidants. 
       
     
     
         2 . A composition according to  claim 1 , which comprises
 a) At least one polyphosphate salt of a 1,3,5-triazine compound (I), wherein   p represents a numeral greater than 3 and   the 1,3,5-triazine content is higher than 1.0 mol 1,3,5-triazine compound per mol of phosphorus atom;   b) At least one layered silicate;   c) A thermoplastic polymer substrate and   d) Phenolic antioxidants.   
     
     
         3 . A composition according to  claim 1 , which comprises
 a) At least one polyphosphate salt of a 1,3,5-triazine compound (I), wherein   p represents a numeral greater than 10 and   the 1,3,5-triazine content is higher than 1.1 mol 1,3,5-triazine compound per mol of phosphorus atom;   b) At least one unmodified layered silicate selected from the group consisting of montmorillonite, bentonite, beidelite, mica, hectorite, saponite, nontronite, sauconite, vermiculite, ledikite, magadite, kenyaite, stevensite, volkonskoite, hydrotalcite, illite, kaolinite, wollastonite, attapulcite, talcum, silica and mixtures thereof;   c) A thermoplastic polymer substrate and   d) Phenolic antioxidants.   
     
     
         4 . A composition according to  claim 1 , which comprises
 a) At least one polyphosphate salt of a 1,3,5-triazine compound (I), wherein   p represents a numeral greater than 10 and the 1,3,5-triazine content is higher than 1.1 mol 1,3,5-triazine compound per mol of phosphorus atom;   b) At least one layered silicate selected from the group consisting of montmorillonite, bentonite, beidelite, mica, hectorite, saponite, nontronite, sauconite, vermiculite, ledikite, magadite, kenyaite, stevensite, volkonskoite, hydrotalcite, illite, kaolinite, wollastonite, attapulgite, talcum, silica and mixtures thereof modified by an ammonium, amine, a phosphonium, sulphonium or a siloxane compound;   c) A thermoplastic polymer substrate and   d) Phenolic antioxidants.   
     
     
         5 . A composition according to  claim 1 , which comprises
 a) At least one polyphosphate salt of a 1,3,5-triazine compound (I), wherein   p represents a numeral greater than 10 and the 1,3,5-triazine content is higher than 1.1 mol 1,3,5-triazine compound per mol of phosphorus atom;   b) At least one unmodified layered silicate selected from the group consisting of montmorillonite, bentonite, beidelite, mica, hectorite, saponite, nontronite, sauconite, vermiculite, ledikite, magadite, kenyaite, stevensite, volkonskoite, hydrotalcite and mixtures thereof;   c) A thermoplastic polymer substrate selected from the group consisting of polyamides and copolyamides; and   d) A phenolic antioxidant selected from the group consisting of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(3,5-di-tert-butyl-4-hydroxyphenyl)isocyanurate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, triethyleneglycol-bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] and N,N′-hexane-1,6-diyl-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide].   
     
     
         6 . (canceled) 
     
     
         7 . A composition according to  claim 1 , wherein the weight ratio of components a):b):c) is in the range from 40:1:1-1:2:1. 
     
     
         8 . A composition according to  claim 1 , wherein the weight ratio of components a):b):c) in the range from 20:1:1-1:1:1. 
     
     
         9 . A mixture, which comprises
 a) At least one polyphosphate salt of a 1,3,5-triazine compound of the formula (I)   
       
         
           
           
               
               
           
         
         Wherein T represents a 1,3,5-triazine compound and 
         p represents a numeral greater than 3; 
         b) At least one natural or synthetic phyllosilicate or a mixture thereof and 
         d) Phenolic antioxidants. 
       
     
     
         10 . A process for imparting flame retardancy to a polymer substrate, which process comprises adding to a polymer substrate a mixture according to  claim 9 . 
     
     
         11 . A process for imparting flame retardancy to a thermoplastic polymer substrate selected from the group consisting of polyamides and copolyamides, which process comprises adding to the polymer substrate a mixture according to  claims 9 .