Melamine melam melem double salt of a polyphosphoric acid...

C - Chemistry – Metallurgy – 07 – D

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C07D 251/54 (2006.01) C08K 5/3492 (2006.01) C08K 5/51 (2006.01) C09K 21/12 (2006.01)

Patent

CA 2281922

A melamine.cndot.melam.cndot.melem double salt of a polyphosphoric acid, which has a solubility of from 0.01 to 0.10 g/100 ml in water (25°C), a pH of from 4.0 to 7.0 as a 10 wt% aqueous slurry (25°C), and a melamine content of from 0.05 to 1.00 mol, a melam content of from 0.30 to 0.60 mol and a melem content of from 0.05 to 0.80 mol, per mol of the phosphorous atom; and A process for producing the above mentioned melamine.cndot. melam.cndot.melem double salt of a polyphosphoric acid, which comprises the following steps (a) and (b): (a) a step of obtaining a reaction product by mixing melamine and phosphoric acid at a temperature of from 0 to 330°C in such a ratio that the melamine is from 2.0 to 4.0 mols per mol of the phosphoric acid (as calculated as orthophosphoric acid content), and (b) a step of baking the reaction product obtained in step (a) at a temperature of from 340 to 450°C for from 0.1 to 30 hours.

Sel composite d'acide polyphosphorique avec mélamine, melam et melem, caractérisé en ce qu'il présente une solubilité dans l'eau (25 DEG C) de 0,01 à 0,10 g/100 ml, un pH de 4,0 à 7,0 tel que mesuré sur sa suspension aqueuse en 10 % de son poids atomique (25 DEG C) et des contenus de mélamine, melam et melem de 0,05 à 1,00 mol, 0,30 à 0,60 mol et 0,05 à 0,80 mol, respectivement, par mol d'atomes phosphorés. L'invention concerne un procédé de préparation du sel composite d'acide polyphosphorique avec mélamine, melam et melem consistant à a) mélanger de la mélamine avec de l'acide phosphorique à une température comprise en 0 et 330 DEG C dans un rapport molaire mélamine-acide phosphorique (en termes d'acide orthophosphorique) de (2,0-4,0)/1 afin de générer un produit de cette réaction et b) à cuire le produit ainsi obtenu à une température entre 340 et 450 DEG C pendant 0,1 jusqu'à 30 heures.

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