Rudolf Pfaendner, Fraunhofer LBF presented investigations into oxymides as a possible new class of PIN flame retardant synergist, acting in the gas phase by releasing radicals which quench oxygen. These nitrogen containing aromatic carbon molecules release nitrogen containing radicals and alkyl or alkoxyl radicals in fire. They can be engineered to enable high temperature processing or to produce polymer forms and can be functionalised with phosphorus or sulphur. Used at loadings of 2-5% with 5-15% phosphonate (phosphorus PIN FR) they have shown to achieve UL94-V0 (1.6 mm) in polypropylene and polyethylene. Synergy has also been demonstrated with melamine cyanurate. This gas phase mechanism does not generate smoke acidity and is not expected to increase smoke toxicity. Further development is underway with an industry partner.
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