Dinuclear Metallocene Catalyst for High Molecular Weight Polyolefins

The patent combines two metallocene catalysts (first and second metallocene catalysts) into a single catalyst composition that produces polyolefin with both narrow molecular weight distribution and high productivity. The first metallocene catalyst produces a first polyolefin component with narrow molecular weight distribution, while the second metallocene catalyst produces a second polyolefin component with broader distribution, and their combination achieves both narrow overall distribution and high productivity, resolving the contradiction between manufacturing precision and productivity.

The patent applies local quality by using different metallocene catalysts with specific structures (first metallocene catalyst with first ligand structure and second metallocene catalyst with second ligand structure) to produce different polyolefin components with specific properties. The first catalyst provides narrow molecular weight distribution while the second provides broader distribution, and their localized roles in the catalyst composition achieve both high productivity and controlled molecular weight distribution.

The patent segments the catalyst system into two separate metallocene catalysts with distinct functions rather than using a single complex dinuclear compound. The first metallocene catalyst is optimized for narrow molecular weight distribution, while the second is optimized for broader distribution and high productivity. This segmentation avoids the structural modification problems of dinuclear compounds with biphenylene bridges while achieving high catalytic activity and controlled molecular weight distribution through the synergistic combination of two simpler, more modifiable catalyst systems.