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[0101] The introduction of the Rx is preferred because the aromatic compound (1) can have a low viscosity and can be liquefied and also because oxidation resistance can be imparted to the aromatic compound. 

[0102] The fluorine-containing alkyl group Rx has pref› erably 1 to 10 carbon atoms, more preferably 1 to 5 carbon atoms, which is preferred from the viewpoint of decrease in a viscosity, liquefaction and oxidation resistance. 

[0103] Further the fluorine-containing alkyl group Rx hav› ing a higher fluorine content is preferred from the viewpoint of oxidation resistance. The fluorine content is not less than 40% by mass, more preferably not less than 50% by mass, particularly preferably not less than 60% by mass, and most preferably Rx is a perfluoro alkyl group. 

[0104] Concretely examples thereof are: 

C$_{3}$F$_{7}$ -, CF 3 -, C $_{2}$F$_{5}$ -, CH $_{3}$CF$_{2}$CF$_{2}$ -, HCF $_{2}$CF$_{2}$CH$_{2}$ -, CF$_{3}$CH$_{2}$-, HCF$_{2}$CF$_{2}$CF$_{2}$CF$_{2}$CH$_{2}$-, H (CF$_{2}$CF$_{2}$ ) $_{4}$CH$_{2}$ -, CF$_{3}$CF$_{2}$CH$_{2}$-, (CF$_{3}$ ) $_{2}$CH-, (CF$_{3}$ ) $_{2}$CF-, C$_{8}$F $_{1 7}$CH$_{2}$CH$_{2}$-, 

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C$_{3}$F$_{7}$0-, CF$_{3}$0-, C$_{2}$F$_{5}$0-, HCF $_{2}$CF $_{2}$CH$_{2}$0-, HCF$_{2}$CF$_{2}$CF$_{2}$CF$_{2}$CH$_{2}$0-, C$_{2}$F$_{5}$CH$_{2}$-, (CF$_{3}$ ) $_{2}$CHO-, C$_{8}$F $_{1 7}$CH$_{2}$CH$_{2}$-, CH$_{3}$CF $_{2}$CF $_{2}$0-, CF$_{3}$CH$_{2}$0-, H(CF$_{2}$CF$_{2}$ ) $_{4}$CH$_{2}$ 0-, (CF$_{3}$ ) $_{2}$CFO-, 

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and the like, and particularly preferred are C$_{3}$F$_{7}$-, CF 3 -, C$_{2}$F$_{5}$-, CF $_{3}$CH$_{2}$ -, HCF $_{2}$CF$_{2}$CH$_{2}$ -, CF $_{3}$CF$_{2}$CH$_{2}$ -, (CF$_{3}$ ) $_{2}$CH-, C$_{3}$F$_{7}$ 0-, CF$_{3}$0-, C$_{2}$F$_{5}$0-, CF$_{3}$CH$_{2}$0-, HCF$_{2}$CF$_{2}$CH$_{2}$-, CF$_{3}$CF$_{2}$CH$_{2}$-, (CF 3 ) $_{2}$CHO- and the like. 

[0105] Also other examples of Ra are (v) monovalent organic groups Rx’ having 2 to 20 carbon atoms which have an ethylenic double bond at an end thereof. 

[0106] Such organic groups are preferred since in addition to the same effects as mentioned above by the moieties of -D- and Ry in the ionic liquid type functional material, it is possible to obtain the fluorine-containing polymer having the fluorine-containing ether unit -D-, functional group Y and aromatic ring structure in its side chain by polymeriza› tion using the ethylenic double bond, thereby making it possible to obtain the ionic liquid type polymer from this fluorine-containing polymer. 

[0107] If the number of carbon atoms of the organic group constituting Rx’ is too high, a viscosity is increased and lowering of polymerizability is recognized. Therefore the number of carbon atoms is preferably from 1 to 10, more preferably from 1 to 5. 

[0108] Concretely Rx’ is a moiety represented by the following formula: 

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wherein X 1 , X 2 , X $^{4 }$and X$^{5 }$are the same or different and each is hydrogen atom or fluorine atom; X 3 is selected from hydrogen atom, fluorine atom, CH$_{3 }$ and CF$_{3}$ ; n3, n4 and n6 are the same or different and each is O or 1, and more concretely there are radically polymerizable moieties such as vinyl group, vinyl ether group, ally! ether group, acryloyl group, methacryloyl group and a-fluoroacryloyl group. 

[0109] Examples thereof are: 

CH$_{2}$=CF----CF$_{2}$ 0-, CH$_{2}$=CH-CF$_{2}$0-, CF$_{2}$=CF› CF $_{2}$0-, CF $_{2}$=CF----CF $_{2}$CF $_{2}$0-, CF $_{2}$=CF---O-, CH$_{2}$=CH---O-, CF$_{2}$=CF----CH$_{2}$0-, CF$_{2}$=CF› CF $_{2}$CF $_{2}$CH$_{2}$-0-, 

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-continued 

