A method of preparing supported catalysts useful for olefin polymerization is described. The catalysts comprise a Group 4 metal complex that incorporates a tridentate dianionic ligand. An activator mixture is first made from a boron compound having Lewis acidity and an excess of an alumoxane. The activator mixture is then combined with a support and the Group 4 metal complex to give a supported catalyst. The method provides an active, supported catalyst capable of making high-molecular-weight polyolefins.
本发明描述了一种制备用于烯烃聚合的负载催化剂的方法。该催化剂包括一个含有三牙双阴离子
配体的第四族
金属配合物。首先从具有
路易斯酸性的
硼化合物和过量的铝氧烷制备激活剂混合物。然后将激活剂混合物与支撑体和第四族
金属配合物结合,形成支撑的催化剂。该方法提供了一种活性支撑催化剂,能够制备高分子量的聚烯烃。