Patent ID: 8686098

Claim:
A fluorine-containing polymer comprising a repeating unit (a) of the following general formula (2) and having a mass-average molecular weight of 1,000 to 1,000,000, where R 1 represents one of the following formulas: R 2 represents a fluorine atom or a trifluoromethyl group; R 8 represents a substituted or unsubstituted alkyl group of the general formula (4) or an aryl group: where R 6 and R 7 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl or aryl group; and R 6 , R 7 and a carbon atom in the general formula (4) may be bonded together to form an alicyclic hydrocarbon group; any number of hydrogen atoms in R 8 may be substituted with a halogen atom, a hydroxyl group, an alkyl group, a fluorine-containing alkyl group or an aryl group; any methylene group in R 8 except for that containing the carbon atom represented by C in the general formula (4) may be replaced by a carbonyl group (Câ•O), an ether group (O), an imide group (NH), a thioether group (S), a sulfinyl group (SO) or a sulfonyl group (SO 2 ); W 1 represents a divalent linking group having a main skeleton formed by one atomic group, or two or more atomic groups in combination, selected from the group consisting of a single bond, substituted or unsubstituted methylene groups, divalent cyclic alkyl groups, divalent aryl groups, substituted or unsubstituted condensed polycyclic aromatic groups, divalent heterocyclic groups, a carbonyl group, an ether group, an ester bond, an oxycarbonyl bond, a thioether group, an amide bond, a sulfonamide bond, an urethane bond and an urea bond; the linking group may have a plurality of atomic groups of the same kind; any number of hydrogen atoms bonded to any carbon atom in the linking group may be substituted with a fluorine atom; and any atoms in the linking group may be bonded together to form a ring structure.