Permethylpentalene Metallocene Catalyst for Olefin Polymerization

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Solution Overview

Problem

There is a need for improved metallocene catalysts with high polymerization activities/efficiencies for use in olefin polymerization reactions, as existing catalysts do not meet the required performance standards.

Innovation Solution

A composition comprising a solid methyl aluminoxane support material and a compound of a specific formula, which acts as a catalyst in olefin polymerization reactions, offering superior catalytic performance compared to current permethyl pentalene metallocene compounds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional metallocene catalysts are used, then the polymerization reaction can proceed, but the catalytic activity and efficiency are insufficient

Engineering Contradiction:

Improvepolymerization activityVSAvoidcatalyst performance consistency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the ligand structure by introducing specific substituent groups (R1-R6) at defined positions on the pentalene ring system, changing the electronic and steric parameters of the catalyst to achieve higher polymerization activity and consistent performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The catalyst comprises a composite structure with a metallocene core complexed with a specifically designed permethylpentalene ligand system, combining multiple functional elements to achieve superior catalytic properties that individual components cannot provide alone

Inventive Principle:

Principle #40Composite materials

2Productivity

If existing metallocene catalysts are used, then olefin polymerization can occur, but the efficiency does not meet required standards

Engineering Contradiction:

Improvepolymerization efficiencyVSAvoidcatalyst structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces specific substituent groups at particular positions (R1-R6) on the pentalene ligand system, creating local variations in electronic and steric properties that enhance catalytic efficiency without requiring complete structural redesign

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition exhibits unusually high catalytic activity in the polymerization of α-olefins, outperforming analogous silica-supported methyl aluminoxane catalysts, and functions as both a catalytic support and activator, eliminating the need for additional activator species.

Implementation Method 1

a composition comprising a solid methyl aluminoxane support material and compound of formula I... which acts as a catalyst in olefin polymerization reactions

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS10888854B2Catalyst comprising permethylpentalene ligands

Publication Date: 2021.01.12 OXFORD UNIVERSITY INNOVATION LTD

AI summary

Catalytic compositions comprising permethylpentalene based metallocene complexes supported on solid methylaluminoxane are disclosed. The compositions are effective catalysts/initiators in the polymerisation of olefins. Also disclosed are uses of the compositions in olefin polymerisation.