Olefin copolymer containing, process for preparing the same, thermoplastic resin composition containing the copolymer and uses thereof polar group.

Olefin copolymer containing a polar group comprising a constituent unit represented by the following formula (1), a constituent unit represented by the following formula (2) and a constituent unit represented by the following formula (3), which has a distribution molecular weight (Mw / Mn) not exceeding 3, and having an intensity ratio of Talfabeta regarding Talfaalfa (Talfabeta / Talfaalfa), as determined from 13C-NMR of said copolymer, not higher 1, 0: wherein R1 and R2 may be same or different and are each a hydrogen atom or an aliphatic hydrocarbon group of linear or branched 1 to 18 carbon atoms; R3 is a hydrocarbon group of straight chain of 11 or more carbon atoms; R4 is a heteroatom or a group containing a heteroatom; r is 0 or 1; X is selected from an alcoholic hydroxyl group, a phenolic hydroxyl group, a carboxylic acid group, a carboxylic acid ester group, an acid anhydride group, an amino group, an amide group, an epoxy group and a mercapto group polar group ; p is an integer of 1 to 3; and when p is 2 or 3, each X may be the same or different, and in this case, if r is 0, X may be bonded to the same atom or different atom of R 3, and if r is 1, X may be bonded at the same or a different atom R4.