Patent ID: 8212068

Claim:
A compound represented by formula (I) wherein X 1 is a methylene group, an ethylene group, a trimethylene group or a vinylene group, X 2 is a divalent group represented by formula A or B and R3 is a group represented by formula (IIIa′) wherein Y is an ethylene group or a vinylene group, m and n are each an integer of 0 to 7, which satisfy m+n=0 to 8, and R1 and R2 are each independently a hydrogen atom, a methyl group or an ethyl group, provided that (1) when X 1 is an ethylene group and X 2 is a divalent group represented by formula A, then R3 is not an n-octyl group; (2) when X 1 is an ethylene group and X 2 is a divalent group represented by formula B, then R3 is not an n-propyl group, an n-butyl group, or an n-tridecanyl group; (3) when X 1 is a methylene group, then X 2 is not a divalent group represented by formula A; (4) when X 1 is a methylene group and X 2 is a divalent group represented by formula B, then R3 is not a straight chain alkyl group having a carbon number of 3 to 12; (5) when X 1 is a vinylene group and X 2 is a divalent group represented by formula B, then R3 is not a straight chain alkyl group, a 3-methylbutyl group, a 6-methylheptyl group, or a 3-hexenyl group; (6) when X 1 is a vinylene group, then X 2 is not a divalent group represented by formula A; and (7) when X 1 is a trimethylene group and X 2 is a divalent group represented by formula A, then R3 is not an n-propyl group or an n-butyl group.