Claudia Vogt and Edwin Kroke (Technical University Bergakademie Freiberg, TUBAF), with Tobias Wagener and Alexander König (BASF), Carl-Christoph Höhne and Jennifer Limburger (Fraunhofer ICT).
Non-halogenated flame retardant solutions are needed for polyurethane and polyisocyanurate (PUR, PIR) foams for applications such as sound and heat insulation in buildings. Different symmetrical and asymmetrical substituted s-triazine phosphonates were synthesised from alkyl phosphites. These phosphorus-nitrogen PIN FRs are liquid, so compatible with foam manufacture. DIN 13501 class E test was achieved in both PUR and PIR at 5 – 7.5% FR loading.