ANTIMONY FREE FLAME RETARD ANT SYSTEMS CONTAINING FLAMESTAB NOR 116 FOR POLYPROPYLENE MOLDING

摘要

Hindered amines are known for their ability to provide UV stability as well as long term thermal stability. Recently, there have been new classes of hindered amines, based on the novel NOR functionalization, that afford additional benefits beyond UV or long term thermal stability. For example, over the last several years we have clearly established the utility of novel NOR type hindered amines, such as Flamestab NOR 116, either as a flame retardant, or flame retardant synergist in combination with conventional halogenated flame retardants in polyolefin thin section substrates, e.g., polypropylene fibers. In this paper, we will provide an update on the recent advances in thick section substrates. Overall, we have found that these novel NOR type hindered amines allow for substantial reduction in the overall concentration of the bromine compounds, mineral fillers, or/and the elimination of antimony trioxide flame retardant synergist. Antimony free flame retardants systems for polypropylene homopolymer molding with UL 94 V-0 and V-2 ratings respectively, have been achieved.