Curable fluorine-containing polymer, curable resin composition prepared from same and antireflection film

A curable fluorine-containing polymer which has a number average molecular weight of from 500 to 1,000,000 and is represented by the formula (1-1):

• MA1A2 (1-1)
• in which the structural unit M is the same structural unit as said formula (M),
• the structural unit A1 is a structural unit represented by the formula (A1):
• wherein X11, X12 and X13 are the same or different and each is H or F;
• X14 is H, F or CF3;
• h is 0, 1 or 2;
• i is 0 or 1;
• Rf4 is a fluorine-containing alkylene group having 1 to 40 carbon atoms or a fluorine-containing alkylene group having 2 to 100 carbon atoms and ether bond;
• Z1 is selected from —OH, —CH2OH, —COOH, carboxylic acid derivative, —SO3H, sulfonic acid derivative, epoxy group and cyano group,
• the structural unit A2 is a structural unit represented by the formula (A2):
• wherein X15, X16 and X18 are H or F;
• X17 is H, F or CF3;
• h1, i1 and j are 0 or 1;
• Z2 is H, F or Cl;
• Rf5 is a fluorine-containing alkylene group having 1 to 20 carbon atoms or a fluorine-containing alkylene group having 2 to 100 carbon atoms and ether bond,
• said polymer comprises from 0.1 to 90% by mole of the structural unit M, from 0 to 99.9% by mole of the structural unit A1 and from 0 to 99.9% by mole of the structural unit A2 and contains from 10 to 99.9% by mole of A1+A2.