Metallocene-Diorganomagnesium Catalyst for Higher Functional Polymer Content
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Solution Overview
Problem
Existing catalytic systems based on rare-earth metal metallocenes and organomagnesium compounds are limited in their ability to increase the functional group content and catalytic activity in the synthesis of functional polymers.
Innovation Solution
A novel catalytic system using a diorganomagnesium compound with a specific benzene nucleus and a rare-earth metal metallocene, where the diorganomagnesium compound acts as an asymmetric co-catalyst, enhancing the functional group content and catalytic activity in polymer synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organomagnesium compounds are used as co-catalysts, then the catalytic system can be activated for polymerization, but the functional group content and catalytic activity are limited
Solution Approach 1:
The patent applies local quality by introducing specific substituents (methyl, ethyl, isopropyl groups) at ortho positions of the benzene nucleus in the diorganomagnesium compound. These localized structural modifications create steric effects and electronic changes that enhance both catalytic activity and functional group content selectively at the active site, rather than uniformly improving all properties.
Solution Approach 2:
The patent employs asymmetry by using diorganomagnesium compounds with different substituents on the two organic groups (RB ≠ RA), creating chiral or asymmetric structures. This asymmetric structure enables the co-catalyst to create chiral environments that favor specific polymerization pathways and increase functional group content while maintaining high catalytic activity.
2Quantity of substance
If the diorganomagnesium compound has specific substituents on the benzene nucleus, then the functional group content increases, but the complexity of the catalyst structure increases
Solution Approach 1:
The patent applies local quality by introducing specific substituents (methyl, ethyl, isopropyl groups) at ortho positions of the benzene nucleus in the diorganomagnesium compound. These localized structural modifications create steric effects and electronic changes that enhance both catalytic activity and functional group content selectively at the active site, rather than uniformly improving all properties.
Solution Approach 2:
The patent employs parameter changes by systematically varying the substituents (methyl, ethyl, isopropyl) and their positions on the benzene nucleus to optimize the balance between functional group content and structural complexity. This allows tuning of the catalyst properties to achieve desired performance characteristics.
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 novel catalytic system improves the functional group content and catalytic activity in the synthesis of functional polymers, particularly in the production of copolymers of olefins and 1,3-dienes, leading to improved polymer properties.
Implementation Method 1
catalytic systems which are based on a rare-earth metal metallocene and on an organomagnesium compound and which are intended to be used in the preparation of polyolefins
Data Source
AI summary
A catalytic system based on at least one metallocene and on a diorganomagnesium compound of formula RB—Mg—RA is provided, RB being different from RA and comprising a benzene nucleus substituted with a magnesium atom, one of the carbon atoms of the benzene nucleus ortho to the magnesium being substituted with a methyl, an ethyl, an isopropyl or forming a ring with the carbon atom which is its closest neighbour and which is meta to the magnesium, the other carbon atom of the benzene nucleus ortho to the magnesium being substituted with a methyl, an ethyl or an isopropyl, RA being an alkyl, a cycloalkyl or a benzyl, which may be substituted or unsubstituted. The catalytic system makes it possible to increase the functional group content in the synthesis of a functional polymer.