| abstract |
A resin comprising a structural unit represented by the formula (IO): [In formula (IO), A 1 , A 2 and A 3 each independently represents a C2-C18 divalent hydrocarbon group, R 1 , R 2 , R 3 and R 4 each independently represents a hydrogen atom or a C1-C6 saturated hydrocarbon group, X 1 and X 2 each independently represent *-O-CO-, -O-CO-O- or -O-, and * represents a bonding position with A 2 or A 3 ]. |