| abstract |
A compound represented by formula (I): n nwherein R 1 represents a hydrogen atom, a halogen atom or a C 1 to C 6 alkyl group in which a hydrogen atom may be replaced by a halogen atom, R 2 represents a C 5 to C 18 hydrocarbon group consisting of the following groups (a) and (b): (a) a liner or branched divalent hydrocarbon group and (b) an alicyclic hydrocarbon group, Rf 1 and Rf 2 each independently represent a C 1 to C 4 perfluoroalkyl group, A 1 represents a single bond, a C 1 to C 6 alkanediyl group or *-A 2 -X 1 -(A 3 -X 2 ) a -(A 4 ) b -,* represents a binding site to an oxygen atom, A 2 , A 3 and A 4 each independently represent a C 1 to C 6 alkanediyl group, X 1 and X 2 each independently represent -O-, -CO-O- or -O-CO-, a represents 0 or 1, and b represents 0 or 1. |