METHOD OF PREPARING POLYPHOSPHATES OF ORGANIC COMPOUNDS Russian patent published in 2008 - IPC C07D295/02 C07D251/54 C07C277/00 C08K5/49 C09K21/04 

FIELD: synthesis of phosphorus-containing derivatives of organic compounds.

SUBSTANCE: invention relates to method of preparing polyphosphates of organic compounds, to mixture of polyphosphates of organic nitrogenous bases, and to use of polyphosphates and mixture of polyphosphates as fire retardants for plastics, preferably thermoplastics and, more particularly, polyamides and polyesters. Polyphosphates of organic compounds are prepared via exchangeable decomposition of mixture of phosphorus pentoxide and at least one organic nitrogenous base with a compound releasing water when decomposed under reaction conditions, the latter compound being used in such molar proportion that water would release in amount corresponding to essentially two moles of water per one mole of phosphorus pentoxide. Water-releasing compound can be compound forming, along with water, only volatile decomposition products and this compound can be selected from group including anhydrous oxalic acid, oxalic acid dehydrate, and formic acid. Exchangeable decomposition reaction is conducted at 100 to 250°C. Mixture of polyphosphates of organic nitrogenous bases is characterized by following properties: when heated to 320°C it looses less than 2% of its mass; pH value of its 10% water suspension exceeds 5 at 25°C, preferably from 5.2 to 7.7 and, more preferably, from 5.8 to 7; its solubility in water is less than 0.1 g and preferably less than 0.01 g per 100 mL water.

EFFECT: expanded synthetic possibilities.

6 cl, 5 ex