PROBLEM TO BE SOLVED: To provide a monofluorophosphoric acid ester salt, a method for producing the same and a fluorine ion releasing composition which allow a fluorine ion to be released continuously in a significant release amount.SOLUTION: The present invention provides a monofluorophosphoric acid ester salt represented by formula (1) (Mn+ is an ion of H, alkali metal, alkaline earth metal, transition metal, rare earth element, Zn, Al, Ga, In, Ge, Sn, Pb or onium R1 is a C1-20 hydrocarbon group, or a C1-20 hydrocarbon group having a halogen atom, a hetero atom or an unsaturated bond n is a valence).SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】フッ素イオンを有意な放出量で持続して放出させることが可能なモノフルオロリン酸エステル塩、その製造方法及びフッ素イオン放出性組成物を提供。【解決手段】式(1)で表されるモノフルオロリン酸エステル塩。(Mn+はH、アルカリ金属、アルカリ土類金属、遷移金属、希土類元素、Zn、Al、Ga、In、Ge、Sn、Pb又はオニウムのイオン;R1はC1~20の炭化水素基又はハロゲン原子、ヘテロ原子若しくは不飽和結合を有するC1~20の炭化水素基;nは価数)【選択図】なし
