Method for purifying polymerizable fluoromonomer by distillation

A purification method for purifying a fluorine-containing polymerizable monomer of the following general formula (1), comprising the following first step:

• a distillation purification step of distilling the fluorine-containing polymerizable monomer in the presence of a phenolic compound A of the following formula (2) and a phenolic compound B of the following formula (3), thereby obtaining the fluorine-containing polymerizable monomer as a distillation fraction
• where R1 is a group selected from a hydrogen atom, a halogen atom, a hydrocarbon group and a fluorine-containing alkyl group which is in straight or branched chain form and optionally contains a cyclic structure;
• R2 is a divalent or trivalent organic group selected from an aliphatic hydrocarbon group which is in straight or branched chain form and optionally contains a cyclic structure, an aromatic ring group and a composite group thereof;
• a part or all of the hydrogen atoms of R2 are optionally substituted with a fluorine atom or a hydroxy group;
• R3 is a hydrogen atom, a hydrocarbon group, a fluorine-containing alkyl group which is in straight or branched chain form and optionally contains a cyclic structure, or an aromatic ring group;
• the hydrocarbon group or fluorine-containing alkyl group of R3 optionally contains a divalent linking group selected form an ether group (—O—) and a carbonyl group (—(C═O)—);
• m is an integer selected from 1 and 2;
• and, when m is 2, two R3 are the same or different,
• where R4 and R5 are each independently a hydrogen atom, a hydroxy group, an alkoxy group of 1 to 4 carbon atoms which is in straight or branched chain form, an alkyl group of 1 to 4 carbon atoms which is in straight or branched chain form, an alkyl group having a cyclic structure, or an unsubstituted aromatic ring group;
• R4 and R5 are the same or different;
• n is an integer selected from 1 and 2;
• and, when n is 2, a plurality of R5 are the same or different,
• where R6, R7, R8 and R9 are each independently a hydrogen atom, a hydroxy group, an alkoxy group of 1 to 4 carbon atoms which is in straight or branched chain form, an alkyl group of 1 to 4 carbon atoms which is in straight or branched chain form, an alkyl group having a cyclic structure, or an aromatic ring group;
• and R6, R7, R8 and R9 are the same or different.