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
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United States of America Patent
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Apr 9, 2002
Grant Date -
Jun 28, 2001
app pub date -
Jan 8, 2001
filing date -
Jul 8, 1998
priority date (Note) -
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Abstract
Salt of a 1,3,5-triazine compound with polyphosphoric 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 water being 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 of condensation n that is higher than 20, by converting a 1,3,5-triazine compound with orthophosphoric acid at room 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 salt of a 1,3,5-triazine compound with a number average degree of condensation n higher than 20.
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