131  US 7,649,118 B2  132  integer of from 1 to 5; mis an integer of from 1 to 5; nl is an  integer of from 1 to 5; m +nl =6;  wherein, R:t4 and Rf’ are the same or different and each is a  fluorine-containing alkyl group having 1 to 10 carbon atoms  or a fluorine-containing alkyl group which has 1 to 10 carbon  atoms and ether bond; Y is the same or different and each is H,  F, Cl, an alky 1 group having 1 to 10 carbon atoms or a fluorine› containing alkyl group which has 1 to 10 carbon atoms and  may have ether bond; R is the same or different and each is H  or an alkyl group having 1 to 10 carbon atoms; n is 0 or an  integer of from 1 to 5;  wherein, R:t4 and Rf’ are the same or different and each is a  fluorine-containing alkyl group having 1 to 10 carbon atoms  or a fluorine-containing alkyl group which has 1 to 10 carbon  atoms and ether bond; Y is the same or different and each is H,  F, Cl, an alky 1 group having 1 to 10 carbon atoms or a fluorine› containing alkyl group which has 1 to 10 carbon atoms and  may have ether bond; R is the same or different and each is H  or an alkyl group having 1 to 10 carbon atoms; n is 0 or an  integer of from 1 to 5; and  wherein, R:t4 is the same or different and each is a fluorine› containing alkyl group having 1 to 10 carbon atoms or a  fluorine-containing alkyl group which has 1 to 10 carbon  atoms and ether bond; R $^{3 }$is H or a hydrocarbon group having  1 to 10 carbon atoms; Y is the same or different and each is H,  F, Cl, an alkyl group having 1 to 10 carbon atoms or a fluorine› containing alkyl group which has 1 to 10 carbon atoms and  may have ether bond; R is the same or different and each is H  or an alkyl group having 1 to 10 carbon atoms; n is 0 or an  integer of from 1 to 5; mis an integer of from 1 to 5; nl is an  integer of from Ito 5; m + nl =6;  wherein R:t4 and Rf’ are the same or different and each is a  fluorine-containing alkyl group having 1 to 10 carbon atoms  or a fluorine-containing alkyl group which has 1 to 10 carbon  atoms and ether bond; Y 1 , Y $^{2 }$and Y$^{3 }$are the same or different  and each is H, F, Cl, an alkyl group having 1 to 10 carbon  atoms or a fluorine-containing alkyl group which has 1 to 10  carbon atoms and may have ether bond; R is the same or  different and each is H or an alky 1 group having 1 to 10 carbon  atoms; n is 0 or an integer of from 1 to 5; at least one ofY1, Y 2  (9)  (8)  wherein Z 4  is the same or different and each is:  wherein  3.  A fluorine-containing polymer having a number average  molecular weight of from 500 to 1,000,000 which has a ring  structure in the polymer trunk chain and is represented by the  formula (13 )-1:  2.  The fluorine-containing polymer of claim  1,  wherein in  the formula (13), provided that (Ml)+(M2) is 100% by mole,  a percent by mole ratio of Ml/M2 is 30/70 to 70/30.  andY $^{3 }$is Fora fluorine-containing alkyl group which has 1 to  10 carbon atoms and may have ether bond;  (10)  (11)  (12)  ~  (Y~m/\__J~; 5 )nl  R–4  I  -C-OH  I  R3  H  H  ~ HR  H  H  n  R/\__J~R  (Y)m  (Z $^{4}$)nl  M2, in its monomeric form, is a fluorine-containing ethyl› enic monomer having 2 or 3 carbon atoms and at least  one fluorine atom; and  N, in its monomeric form, is an ethylenically unsaturated  monomer copolymerizable with Ml and M2, and the  structural units Ml, M2 and N are contained in amounts  of from 1 to 99% by mole, from 1 to 99% by mole and  from 0 to 98% by mole, respectively.  Ml-1, in its monomeric form, is at least one monomer  selected from the norbomene compounds having a fluo› rine-containing alcohol structure represented by the for› mulae (8) to (12);  -(Ml-1)-(Ml-2)-(M2)-(N)- (13)-1 