Flame retardants and flame retardant compositions formed therewith

Abstract

The flame retardant additive compositions comprise (a) one or more bromocycloaliphatic flame retardants; (b) one or more bromoaromatic flame retardants; and (c) one or more synthetic zeolites. Flame retardant polymer compositions comprising at least one thermoplastic polymer such as HIPS with which has been blended, singly and/or in one or more combinations, a flame retardant amount of at least (a), (b), and (c) have a very desirable balance of properties.

That which is claimed is:  
     
         1 . A flame retardant additive composition which comprises (a) one or more bromocycloaliphatic flame retardants, (b) one or more bromoaromatic flame retardants, and (c) one or more synthetic zeolites; in proportions in the range of about 15 to about 50 wt % of(a), in the range of about 35 to about 70 wt % of (b), and in the range of about 5 to about 25 wt % of (c), with the total of (a), (b), and (c) being 100 wt %.  
     
     
         2 . A composition of  claim 1  wherein said proportions are in the range of about 20 to about 40 wt % of (a), in the range of about 45 to about 65 wt % of (b), and in the range of about 7 to about 20 wt %, of (c), with the total of (a), (b), and (c) being 100 wt %.  
     
     
         3 . A composition of  claim 1  wherein said proportions are in the range of about 30 to about 40 wt % of (a), in the range of about 50 to about 55 wt % of (b), and in the range of about 8 to about 15 wt %, of (c), with the total of (a), (b), and (c) being 100 wt %.  
     
     
         4 . A composition of any of claims  1 ,  2 , or  3  wherein (b) consists essentially of a bromoaromatic compound containing at least two polybromoaromatic groups in the molecule.  
     
     
         5 . A composition of  claim 4  wherein (a) consists essentially of 1,2,5,6,9,10-hexabromocyclododecane.  
     
     
         6 . A composition of  claim 4  wherein (a) is 1,2,5,6,9,10-hexabromocyclododecane, (b) is 1,2-bis(pentabromophenyl)ethane, and (c) is zeolite-A.  
     
     
         7 . A composition of any of claims  1 ,  2 , or  3  further comprising at least one flame retardant synergist and at least one tin-containing thermal stabilizer.  
     
     
         8 . A composition of  claim 7  wherein (a) is 1,2,5,6,9,10-hexabromo-cyclododecane, (b) is 1,2-bis(pentabromophenyl)ethane, and (c) is zeolite-A.