Olefin Functionalization via Metathesis Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing end-functionalized polyolefins through metathesis reactions are inefficient, often resulting in unwanted by-products and requiring multi-step processes, and lack a cost-effective and atom-economical route for introducing functional groups into polyolefins.
Innovation Solution
A process involving the use of an alkene metathesis catalyst to react vinyl-terminated polyolefins with heteroatom-containing alkenes, allowing for the formation of polar end-functionalized polyolefins under mild conditions in a single step, suitable for various polyolefins such as isotactic polypropylene, atactic polypropylene, and ethylene propylene copolymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-step processes are used to produce end-functionalized polyolefins, then functionalization can be achieved, but the process complexity increases and unwanted by-products are generated
Solution Approach 1:
The patent combines multiple functionalization steps into a single metathesis reaction step. The cross-metathesis reaction directly functionalizes vinyl-terminated polyolefins with heteroatom-containing alkenes in one operation, eliminating the need for separate protection, functionalization, and deprotection steps that characterize traditional multi-step processes.
Solution Approach 2:
The invention extracts and eliminates the intermediate steps that generate by-products in conventional processes. By using a direct metathesis approach, the method removes unnecessary transformation steps, thereby reducing waste generation while maintaining functionalization effectiveness.
2Manufacturing precision
If traditional functionalization methods are used, then polyolefins can be functionalized, but reactant and energy waste increases
Solution Approach 1:
The patent employs metathesis catalysts that operate under milder reaction conditions compared to traditional functionalization methods. The reaction can proceed at lower temperatures and with shorter reaction times, thereby reducing energy input requirements while achieving effective functionalization of polyolefin chains.
Solution Approach 2:
The invention converts the vinyl terminal groups, which are often considered defects or unwanted features in polyolefins, into valuable functional handles. The metathesis reaction specifically targets these vinyl ends, transforming what could be seen as waste into the site of desired functionalization, thereby improving atom economy.
3Adaptability or versatility
If cross-metathesis is used to functionalize polyolefins with pendant vinyl groups, then polar-functionalized products can be formed, but graft-type structure complexity increases
Solution Approach 1:
The patent applies functionalization locally at the chain ends rather than throughout the polymer backbone. By targeting vinyl-terminated ends specifically, the method introduces functional groups at discrete locations (the chain termini) rather than creating distributed graft structures along the polymer chain, thereby simplifying the overall molecular architecture.
4Adaptability or versatility
If multiple reaction steps are employed for polyolefin functionalization, then various functional groups can be added, but reaction time and productivity decrease
Solution Approach 1:
The metathesis reaction platform provides universal functionality for introducing diverse heteroatom-containing groups. By selecting different heteroatom-containing alkene reactants (such as those containing oxygen, nitrogen, sulfur, or halogen atoms), a wide variety of functional groups can be introduced in a single reaction type, eliminating the need for multiple specialized reaction steps.
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
This method effectively produces end-functionalized polyolefins with high conversion efficiency and versatility, enabling their use in applications like compatibilizers, tie-layer modifiers, and surface modifiers while minimizing waste and energy consumption.
Implementation Method 1
Metathesis is generally thought of as the interchange of radicals between two compounds during a chemical reaction. There are several varieties of metathesis reactions, such as ring opening metathesis, acyclic diene metathesis, ring closing metathesis and cross metathesis.
Implementation Method 2
A process involving the use of an alkene metathesis catalyst to react vinyl-terminated polyolefins with heteroatom-containing alkenes, allowing for the formation of polar end-functionalized polyolefins under mild conditions in a single step
Data Source
AI summary
This invention relates to a process to functionalize propylene co-oligomer comprising contacting an alkene metathesis catalyst with a heteroatom containing alkene, and a propylene a co-oligomer having an Mn of 300 to 30,000 g/mol comprising 10 to 90 mol % propylene and 10 to 90 mol % of ethylene, wherein the oligomer has at least X % allyl chain ends, where: 1) X=(−0.94 (mol % ethylene incorporated)+100), when 10 to 60 mol % ethylene is present in the co-oligomer, and 2) X=45, when greater than 60 and less than 70 mol % ethylene is present in the co-oligomer, and 3) X=(1.83*(mol % ethylene incorporated)−83), when 70 to 90 mol % ethylene is present in the co-oligomer. This invention also relates to a process to functionalize propylene homo-oligomer comprising contacting an alkene metathesis catalyst with a heteroatom containing alkene, and a propylene homo-oligomer, comprising propylene, wherein the oligomer has: at least 93% allyl chain ends, an Mn of about 500 to about 20,000 g/mol, an isobutyl chain end to allylic vinyl group ratio of 0.8:1 to 1.2:1.0, and less than 100 ppm aluminum.