Process for preparing block copolymer of monoolefin

摘要

A process for preparing a block copolymer of an alpha -olefin and a vinyl compound is here disclosed which comprises the steps of polymerizing an olefin selected from ethylene and the alpha -olefin having 3 or more carbon atoms by the use of a divalent or a trivalent rare earth metal complex, and then polymerizing a vinyl compound, a vinylidene compound or a lactone. According to the process of the present invention, a polar group can be introduced into a polyolefin, whereby the characteristics of the polymer can be effectively improved.