Olefin Polymerization Catalyst with Internal Electron Donor

The patent changes the chemical parameters of the internal electron donor by selecting specific compounds with different electron-donating capabilities. The internal electron donor is chosen from compounds where R1-R6 are independently selected from hydrogen, alkyl, or aromatic groups, with specific preferences for compounds containing aromatic rings. This parameter change in the donor structure optimizes both stereochemistry control and molecular weight distribution breadth.

The catalyst system employs a composite approach by combining a transition metal halide (typically TiCl4) supported on magnesium chloride with a specifically selected internal electron donor compound and an external electron donor. This composite catalyst system integrates multiple functional components that work synergistically to achieve both high stereochemistry control and broad molecular weight distribution.

The internal electron donor compound acts as an intermediary between the transition metal catalyst and the polymerization process. It modulates the catalyst's electronic properties and steric environment, enabling high activity while maintaining precise control over molecular weight distribution. The donor compound mediates the interaction between the catalyst and monomer, ensuring both productivity and property control.

The patent optimizes the structural parameters of the internal electron donor to achieve the desired balance between activity and control. Specific compounds with aromatic rings and particular substituent patterns are selected to provide optimal electron donation, which enhances catalyst activity while simultaneously controlling the molecular weight distribution through steric and electronic effects.