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Process for making long-chain ammonium polyphosphate

Process for making long-chain ammonium polyphosphate

United States Patent (4,396,586): 4

A process is described for making long chain ammonium polyphosphate consisting essentially of crystalline modification II. A mixture of phosphorus pentoxide and ammonium orthophosphate in a molar ratio of 1:0.9-1.1 is reacted with 0.1-15 mol % of melamine or its condensation products selected from melam, melem or mellon, calculated as melamine, at 50 degrees -150 degrees C in the presence of an excess of ammonia.

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Accession: 001239007

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