Process for making long-chain ammonium polyphosphate

Details Process for making long-chain ammonium polyphosphate Process for making long-chain ammonium polyphosphate

1981-10-09

1983-08-02

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423315, C01B 2528

Patent

active

043965865

ABSTRACT:
The invention relates to a process for making long chain ammonium polyphosphate consisting essentially of crystalline modification II. To this end, a mixture of phosphorus pentoxide and ammonium orthophosphate in a molar ratio of 1:0.9 to 1:1.1 is reacted with 0.1 to 15 mol % of melamine or its condensation products selected from melam, melem or mellon, calculated as melamine, at a temperature within the range 50.degree. to 150.degree. C. in the presence of an excess of ammonia and the reaction product is heat-treated at temperatures within the range 200.degree. to 400.degree. C.

REFERENCES:
patent: 2781281 (1957-02-01), Berger
patent: 3333921 (1967-08-01), Knollmueller et al.
patent: 3495937 (1970-02-01), Yushen
patent: 3653821 (1972-04-01), Heymer et al.
patent: 3723074 (1973-03-01), Sears et al.
patent: 3775315 (1973-11-01), Smith et al.
patent: 3912802 (1975-10-01), McCullough et al.
patent: 4043987 (1977-08-01), Joliceour et al.
Shen et al., "Preparation and Characterization of Crystalline Long-Chain Ammonium Polyphosphates", J. Amer. Chem. Soc. 91:62-66, (1969).

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