| abstract |
Preparation of a block copolymer comprising a polyethylene block and a block formed of the polymerization of one or more vinyl monomers, at least 50 mol% of which being selected from the list consisting of ethylene, vinyl esters, non-conjugated N-vinyl monomers, acrylonitrile, (meth)acrylates and (meth)acrylamides, at least one of said one or more vinyl monomers not being ethylene, the process comprising: na. Polymerizing ethylene or the one or more vinyl monomers in presence of an organic cobalt complex, thereby forming a macroinitiator, nb. Contacting the macroinitiator with either ni. The one or more vinyl monomers, if ethylene was polymerized in step a, or nii. ethylene, if the one or more vinyl monomers were polymerized in step a, nthereby forming a second polymer block, and thereby forming the block copolymer, wherein forming the polyethylene block is performed under a pressure of at least 300 bar. |