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:
a. Polymerizing ethylene or the one or more vinyl monomers in presence of an organic cobalt complex, thereby forming a macroinitiator,
b. Contacting the macroinitiator with either
i. The one or more vinyl monomers, if ethylene was polymerized in step a, or
ii. ethylene, if the one or more vinyl monomers were polymerized in step a,
thereby 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.
制备嵌段共聚物,该嵌段共聚物包括聚
乙烯嵌段和由一种或多种
乙烯基单体聚合形成的嵌段,其中至少 50 摩尔%的
乙烯基单体选自
乙烯、
乙烯基酯、非共轭 N-
乙烯基单体、
丙烯腈、(甲基)
丙烯酸酯和(甲基)
丙烯酰胺,所述一种或多种
乙烯基单体中至少有一种不是
乙烯,该工艺包括
a.在有机
钴络合物存在下聚合
乙烯或一种或多种
乙烯基单体,从而形成大
引发剂、
b.将大
引发剂与以下任一物质接触
i.一种或多种
乙烯基单体(如果
乙烯在步骤 a 中聚合),或
ii.
乙烯(如果在步骤 a 中聚合了一种或多种
乙烯基单体)、
从而形成第二聚合物嵌段,进而形成嵌段共聚物,其中聚
乙烯嵌段的形成是在至少 300 巴的压力下进行的。