content_image/941813.jpg content_image/941822.jpg content_image/941823.jpg content_image/941824.jpg
wherein X1, X 2 , X 3 , X 4 , X 5 , n3, D 2 and Ry 4 are as defined in the formula (5), from the viewpoint of excellent homopo› lymerizability and copolymerizability with a fluorine-con› taining ethylenic monomer and also from the point that oxidation resistance and heat resistance can be imparted effectively to the obtained polymer. 

[0198] Examples of the aromatic compounds of the for› mula ( 6) are: 

CH$_{2}$=CFCF$_{2}$-D $^{2}$-Ry4 , CF$_{2}$=CF-D $^{2}$-Ry4 , CF$_{2}$=CFCF$_{2}$-D $^{2}$-Ry4 , CH$_{2}$=CH-D $^{2}$-Ry4 , CH$_{2}$=CHCH$_{2}$-D $^{2}$-Ry4 , CH$_{2}$=CFCF$_{2}$0-D $^{2}$-Ry4 , CF$_{2}$=CFO-D $^{2}$-Ry4 , CF$_{2}$=CFCF$_{2}$0-D $^{2}$-Ry4 , CH$_{2}$=CHO-D $^{2}$-Ry4 , CH$_{2}$=CHCH$_{2}$0-D $^{2}$-Ry4 and the like, and particularly preferred are: CH$_{2}$=CFCF$_{2}$-D $^{2}$-Ry4 , CF$_{2}$=CF-D $^{2}$-Ry4 , CH$_{2}$=CFCF$_{2}$0-D $^{2}$-Ry4 and CF$_{2}$=CFO-D $^{2}$-Ry4 

because polymerizability is high and oxidation resistance and heat resistance can be effectively imparted to the poly› mer. 

[0199] Also preferred examples of the structure of the whole aromatic compound of the formula (6) are the same as those of (1-e), (1-f) and (1-g) among the classified examples of the aromatic compound of the formula (1 ). 

[0200] The third of the present invention relates to a novel fluorine-containing polymer which is included in the poly› mers of the formula (M-1) to be used in the ionic liquid type functional material, and is one of the most preferred ionic liquid type functional materials. 

[0201] The novel polymer of the present invention is the fluorine-containing polymer which has a number average molecular weight of from 500 to 1,000,000 and is repre› sented by the formula (M-3): 

<img src='content_image/941813.jpg'>

wherein the structural unit M3 is a structural unit repre› sented by the formula (7): 

<img src='content_image/941822.jpg'>

wherein X 6 , X 7 , X 9 and X$^{10 }$are the same or different and each is hydrogen atom or fluorine atom; X $^{8 }$is selected from hydrogen atom, fluorine atom, CH$_{3 }$ and CF$_{3}$ ; n3 and n4 are the same or different and each is 0 or 1; D 2 and Ry 4 are as defined in the formula (5); the structural unit A3 is a structural unit derived from a monomer being copolymer› izable with the monomer being capable of providing the structural unit M3, and the structural units M3 and A3 are contained in amounts of from 1 to 100% by mole and from 0 to 99% by mole, respectively. 

[0202] The polymer of the formula (M-3) is a novel polymer which is not disclosed in patent publications and bulletins. 

[0203] The polymer of the formula (M-3) of the present invention is obtained by polymerizing the aromatic com› pound of the formula (5) having an ethylenic double bond, and may be a homopolymer containing only the structural unit M3 or may be a copolymer of the monomer of the formula (5) being capable of providing M3 and a copoly› merizable monomer. 

[0204] Examples of the structural unit M3 in the polymer of the formula (M-3) are: 

(7) 

and the like, and particularly preferred as the structural unit M3 are structural units represented by the formula (8): 

<img src='content_image/941823.jpg'>

<img src='content_image/941824.jpg'>

(8) 

