Extruded polymer foams containing brominated fatty acid-based flame retardant additives
Extruded polymer foams are prepared using brominated fatty acids, an ester, amide or ester-amide of a brominated fatty acid, a glyceride of one or more brominated fatty acids, or a polymerized brominated fatty acid as an FR additive. The brominated FR additives unexpectedly are stable at the extrusion temperatures, and provide excellent flame retardancy to the foams.
1. An extruded combustible polymer foam containing a flame retarding amount of a brominated fatty acid, an ester, amide or ester-amide of a brominated fatty acid, a glyceride of one or more brominated fatty acids, a polymerized brominated fatty acid, or a mixture of any two or more of the foregoing, and a melt flow promoter, wherein said combustible polymer is polystyrene, a styrene-acrylic acid copolymer, or a styrene-acrylonitrile copolymer or a mixture of two or more thereof.
2. The extruded combustible polymer foam of claim 1 which has a density of from 1 to 30 lb/ft 3 (16-480 kg/m 3 ).
3. The extruded combustible polymer foam of claim 1 wherein the brominated fatty acid, an ester, amide or ester-amide of a brominated fatty acid, a glyceride of one or more brominated fatty acids, a polymerized brominated fatty acid, or a mixture of any two or more thereof is present in an amount sufficient to provide from 0.5 to 10 parts of bromine per 100 parts of combined weight of the combustible polymer and the brominated fatty acid, an ester, amide or ester-amide of a brominated fatty acid, a glyceride of one or more brominated fatty acids, a polymerized brominated fatty acid, or a mixture of any two or more thereof.
4. The extruded combustible polymer foam of claim 3 , further comprising an IR attenuator.
5. The extruded combustible polymer foam of claim 4 wherein the IR attenuator is carbon, graphite or a mixture thereof.
6. The extruded combustible polymer foam of claim 3 , wherein the melt flow promoter includes 2,3-dimethyl-2,3-diphenylbutane or 1,4-diisopropyl benzene.
7. An extruded combustible polymer molded article, the extruded combustible polymer molded article containing a flame retarding amount of a brominated fatty acid, an ester, amide or ester-amide of a brominated fatty acid, or a glyceride of one or more brominated fatty acids, a polymerized brominated fatty acid, or a mixture of any two or more of the foregoing, wherein said combustible polymer is polystyrene, a styrene-acrylic acid copolymer, or a styrene-acrylonitrile copolymer or a mixture of two or more thereof.