Multi-component, polar group-containing olefin copolymer

A multi-component, polar group-containing olefin copolymer comprising:

• at least one structural unit (A) selected from the group consisting of a structural unit derived from ethylene and a structural unit derived from an α-olefin which contains 3 to 20 carbon atoms,
• a structural unit (B) derived from a polar group-containing olefin monomer represented by the following general formula (1), and
• a structural unit (C) derived from a non-polar cyclic olefin represented by the following general formula (2),
• wherein a phase angle δ at which an absolute value G* of a complex modulus measured with a rotational rheometer is 0.1 MPa (G*=0.1 MPa) is from 50 degrees to 75 degrees, and
• wherein a number of methyl branches calculated by 13C-NMR is 5 or less per 1,000 carbon atoms:
• where T1 to T3 are each independently a substituent selected from the group consisting of a hydrogen atom, a hydrocarbon group which contains 1 to 20 carbon atoms, a silyl group which contains a carbon skeleton having 1 to 18 carbon atoms, an alkoxy group which contains 1 to 20 carbon atoms, a halogen atom and a cyano group;
• T4 is a substituent selected from the group consisting of:
• an ester group which contains 2 to 30 carbon atoms, a carboxyl group, a carboxylic acid salt group,
• an alkoxycarbonyl group which contains 2 to 30 carbon atoms and in which part of a carbon skeleton is substituted with at least one substituent selected from the group consisting of an ester group, a carboxyl group and a carboxylic acid salt group,
• a hydrocarbon group which contains 2 to 20 carbon atoms and in which part of a carbon skeleton is substituted with at least one substituent selected from the group consisting of an ester group, a carboxyl group and a carboxylic acid salt
• an alkoxy group which contains 1 to 20 carbon atoms and in which part of a carbon skeleton is substituted with at least one substituent selected from the group consisting of an ester group, a carboxyl group and a carboxylic acid salt group,
• an acyloxy group which contains 2 to 20 carbon atoms and in which part of a carbon skeleton is substituted with at least one substituent selected from the group consisting of an ester group, a carboxyl group and a carboxylic acid salt group,
• a substituted amino group which contains 1 to 12 carbon atoms and in which part of a carbon skeleton is substituted with at least one substituent selected from the group consisting of an ester group;
• a carboxyl group and a carboxylic acid salt group, and
• a substituted silyl group which contains 1 to 18 carbon atoms and in which part of a carbon skeleton is substituted with at least one substituent selected from the group consisting of an ester group;
• a carboxyl group and a carboxylic acid salt group;
• the carboxylic acid salt group is a carboxylic acid salt group which contains a metal ion of Group 1, 2 or 12 of the periodic table;
• and
• T1, T2, T34 and T4 are optionally bound to form a ring,
• where R1 to R12 are each optionally the same or different and are each selected from the group consisting of a hydrogen atom, a halogen atom and a hydrocarbon group which contains 1 to 20 carbon atoms;
• R9 and R10 are optionally integrated to form a divalent organic group, and R11 and R12 are optionally integrated to form a divalent organic group;
• R9 or R10 optionally forms a ling with R11 or R12;
• and
• n is 0 or a positive integer, and when n is 2 or more, R5 to R8 are each optionally the same or different in each repeating unit.