Fluoroalkyl group-containing n-substituted (meth)acrylamide compound, polymer thereof, and use thereof

A compound having a formula (a):

• CH2═CR1—CONJ-CGR2—(CH2)n—COO-Q1-Rf1 (a)
• wherein
• R1 is a hydrogen atom or a methyl group,
• R2 is a group having a formula (r):
• —(CH2)m—COO-Q2-Rf2(r),
• n and m are each independently an integer of 0 to 4,
• Rf1 and Rf2 are each independently a polyfluoroalkyl group or a polyfluoroether group having 1 to 6 carbon atoms,
• Q1 and Q2 are each independently a single bond or a divalent linkage group,
• J is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and
• G is a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a group having the formula (r),
• wherein the —CONJ-CGR2— moiety in formula (a) may be a structure having a formula (s1) or (s2):
• wherein j and g are each independently a single bond or an alkylene group containing 1 to 3 carbon atoms wherein j and g are not both a single bond, and the alkylene group is optionally substituted with the group having the formula (r), and when a plurality of groups having the formula (r) are present in the compound having the formula (a), they may have the same structure or different structures.