METHOD FOR COPOLYMERIZATION AND RESULTING COPOLYMERS

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The invention concerns a method for preparing block copolymers comprising steps which consist in : polymerising a first monomer using an organolanthanide catalyst wherein said catalyst in the form of a hydride complex of a trivalent metal from the group of rare earths; then in polymerising at least a second monomer. The invention also concerns block copolymers whereof the blocks are polyolefins.