FLAME RETARDANT EXPANDABLE POLY(ARYLENE ETHER)/POLYSTYRENE COMPOSITIONS AND PREPARATION THEREOF

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A non-halogenated, fire retardant, expandable poly (arylene ether)/polystyrene blends is produced by the method comprising, in a first step, forming a fire retardant mixture comprising a non-halogenated fire retardant, poly(arylene ether) resin and polystyrene resin by intimately mixing in melt; and in a second step, forming the non-halogenated, fire retardant, expandable poly (arylene ether)/polystyrene blend by intimately mixing in melt the fire retardant mixture with a blowing agent.