An olefin polymerization process is disclosed. The polymerization is performed in the presence of a clay, an activator, and a transition metal complex that has at least one pyridine moiety-containing ligand. The presence of clay increases the catalyst activity. The process is suitable for making ultra-high molecular weight polyethylenes (UHMWPE). The UHMWPE produced has increased bulk density.

 
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< Process for producing catalyst for -olefin polymerization and process for producing -olefin polymer

> Process for the oligomerization of -olefins having low unsaturation, the resulting polymers, and lubricants containing same

> Transition metal complexes in the controlled synthesis of polyolefins substituted with functional groups
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