To provide a polyolefin-based graft copolymer produced by polymerizing an olefin monomer in a macromonomer latex by using a coordination polymerization catalyst composed of a late-periodic transition metal complex, wherein the polyolefin-based graft copolymer imparts a composition excellent in tensile elongation and impact resistance by compounding with a thermoplastic resin such as a polypropylene or the like, and to provide a composition comprising the copolymer and to provide a method for producing the same.

The invention relates to the polyolefin-based graft copolymer produced by polymerizing the olefin monomer in the macromonomer latex by using the coordination polymerization catalyst composed of the late-periodic transition metal complex, wherein the tensile elongation and the impact resistance of the composition are improved by setting the composition of the macromonomers in a specific range.