Patent ID: 7132466

Claim:
A compound of the formula Z 1 -O-[m(R 1 PO 3 ),n(R 2 HPO 3 )]-Z2(I), wherein [m(R 1 PO 3 ),n(R 2 HPO 3 )]represent a copolyphosphate, with m (R 1 PO 3 ) units and n (R 2 HPO3) units; R 1 is an ammonium building block; R 2 is a 1,3,5-triazine building block; Z 1 and Z 2 are ammonium or 1,3,5-triazine building blocks, to be chosen independently of each other; m and n are whole numbers greater than or equal to 1; with the proviso that the sum of m and n is greater than 3; obtained by heating a simple compound containing a phosphate building block, a 1,3,5-tirazine building block and an ammonium building block under a partial ammonia pressure of at least 0.005 MPa at a temperature between 200 and 400° C.