POLYPHOSPHATE SALT OF A 1,3,5-TRIAZINE COMPOUND WITH A HIGH DEGREE OF CONDENSATION, A PROCESS FOR ITS PREPARATION AND USE AS FLAME RETARDANT IN POLYMER COMPOSITIONS

摘要

ABSTRACTSalt of a 1,3,5-triazine compound withpolyphosphoric acid with a virtually linear structure, with the number average degree of condensation n being higher than 20, the content of the 1,3,5-triazine compound being higher than 1.1 mole per mole of phosphorus atom and the pH of a 10% slurry in waterbeing higher than 4.5. Further, a process for the preparation of the polyphosphate salt of a 1,3,5 triazine compound with a number average degree ofcondensation n that is higher than 20, by converting a 1,3,5-triazine compound with orthophosphoric acid atroom temperature into the phosphate of the 1,3,5 triazine compound, after which this salt is converted at elevated temperature into a polyphosphate of the 1,3,5-triazine compound, and further flame retardant polymer compositions comprising the polyphosphate saltof a 1,3,5-triazine compound with a number average degree of condensation n higher than 20.