FLUORINE-CONTAINING COPOLYMER

An object of the present invention is to provide a novel fluorine-containing copolymer capable of providing antifouling coating compositions etc. This object of the present invention is achieved by a fluorine-containing copolymer represented by formula (1): wherein R a1 represents a perfluoropolyether group-containing monovalent or divalent group, X a represents -O-, phenylene, -N(-R E )- (R E represents an organic group), or carbazolylene, R a2 represents hydrogen or alkyl, R a3 represents hydrogen or alkyl, Q, in each occurrence, independently represents a structural unit having a functional group selected from a substituent group A or a structural unit not having a functional group selected from the substituent group A, R c represents a perfluoropolyether group-containing group, an organic group having or not having a functional group selected from the substituent group A, or hydrogen, X c represents -O-, -S-, -NH-, or a single bond, k represents 1 or 2, n1 represents the number of repeating units of 1 or more, the substituent group A comprising a hydroxyl group, a thiol group, an epoxy group, an amino group, alkylamino groups, dialkylamino groups, a triazole group, and precursors thereof, with the proviso that R a2 or R a3 or both are alkyl, and when R c does not represent an organic group having a functional group selected from the substituent group A, at least one Q represents a structural unit having a functional group selected from the substituent group A.