Patent ID: 7662778

Claim:
A compound represented by formula (1) wherein R 11 , R 21 , R 31 , and R 41 independently are a hydrogen or methyl group; R 22 , R 23 , R 32 , R 33 , R 42 , and R 43 independently are any one of hydrogen, a linear alkyl group comprising 1 to 6 carbons, a linear alkyl group comprising 1 to 6 carbons to which a non-aromatic cyclic alkyl group or a substituted or unsubstituted aromatic ring is attached, a non-aromatic cyclic alkyl group, or a non-aromatic cyclic alkyl group to which a non-aromatic cyclic alkyl group or a substituted or unsubstituted aromatic ring is attached; each of R 21 and R 22 , R 31 and R 32 , and R 41 and R 42 independently form a non-cyclic structure without bonding to each other, or come together to form a cyclic structure by bonding to each other through a linear alkylene group having a chain length of 2 to 5 carbons, a linear alkylene chain having a chain length of 2 to 5 carbons and having attached thereto a branched chain of 3 to 6 carbon atoms, or a linear alkylene chain having a chain length of 2 to 5 carbons and having attached thereto a cyclic structure of 1 to 6 carbon atoms; n is an integer from 4 to 6; and X is selected from the group consisting of: