| 摘要 |
HOE 89/H 021 Process for producing ammonium polyphosphate which gives a low-viscosity aqueous suspension of the disclosure A process for producing essentially water-insoluble, chain-type ammonium polyphosphates of the general formula (NH4PO3)n, in which n is a number from 10 to 1,000, whose 20% by weight aqueous suspension prepared at 60.degree.C has a viscosity of less than 100 mPa.s at 20.degree.C, is indicated, which comprises allowing a reaction mixture of ammonium orthophosphate and phosphorus pentoxide to react fully at a high mixing intensity in a crumbly phase at a temperature from 100 to 300.degree.C over a period of from 10 to 60 minutes and then heat-treating the reaction material in a known manner over a period of from 50 to 200 minutes at a temperature from 200 to 300.degree.C under an ammonia atmosphere. Advantageously, the reaction is carried out in a kneader.
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