Branched olefin copolymer, process for producing the same, and use thereof

A branched olefin copolymer comprising a building block (A) represented by formula (1) and a building block (B) represented by formula (2):

• wherein the formula (1), R1 represents a hydrogen atom or a C1-18 linear or branched aliphatic hydrocarbon group;
• in the formula (2), R2 represents a C1-18 linear or branched aliphatic or aromatic hydrocarbon group;
• F represents a heteroatom or a heteroatom-containing linking group which contains at least one group selected from a carbonyl group and an aryl group;
• Z represents a polymer segment consisting of a monomer comprising a carbon-carbon double bond-containing moiety containing at least one member selected from the group consisting of an oxygen atom, a nitrogen atom, a halogen atom and an aryl group and having a molecular-weight distribution of 1.0 to 3.0;
• W represents a group selected from an alcoholic hydroxyl group, a phenolic hydroxyl group, a carboxylic acid group, a carboxylate group, an acid anhydride group, an amino group, an epoxy group, a siloxy group and a mercapto group;
• n is an integer of 1 to 3 and m is 0, 1 or 2 provided that when n is 2 or 3, Z may be the same or different to each other, and when m is 2, W may be the same or different to each other;
• and W may be bound to the same or different atom of R2 to form a cyclic structure.