Patent ID: 7514520

Claim:
A method for preparing a cyclic and/or linear phosphonitrilic acid ester represented by the formula (5) where Q represents an aryloxy group or an alkoxy group and m represents an integer of 3 or more, the method comprising: reacting a cyclic and/or linear phosphonitrile dichloride with at least one compound selected from a phenolic compound and an alcohol compound in the presence of a reaction solvent, wherein: the cyclic and/or linear phosphonitrile dichloride is represented by the formula (1) where m represents an integer of 3 or more, the phenolic compound is represented by formula (2) or (3) where M is a hydrogen atom or an alkaline metal, R 1 to R 5 are any of a hydrogen atom, an OM group, an aliphatic hydrocarbon group having 1 to 10 carbon atoms and an aromatic hydrocarbon group having 6 to 10 carbon atoms, and adjacent groups in R 1 to R 5 may form a ring where M is a hydrogen atom or an alkaline metal, and R 6 is an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms, the alcohol compound is represented by the following general formula (4) R 7 O-M (4) where M is a hydrogen atom or an alkaline metal, and R 7 is an aliphatic hydrocarbon group having 1 to 10 carbon atoms, (i) the reaction solvent is at least one solvent selected from aromatic hydrocarbons and halogenated hydrocarbons, and (ii) the reaction is performed in the presence of a catalyst represented by the formula (6) (NH 4 ) p A q X r (6) where A is an element from one of groups IIA, IIIA, IVA, VA, VIA, VIIA, IB, IIB, IIIB, IVB, VB, VIB, VIIB and VIII in the long periodic table, X represents a halogen atom; p is an integer of 1 to 10, q is an integer of 1 to 10 and r is an integer of 1 to 35.