Alkyl Metalloxane Co-Catalyst for Broad Polyolefin Distribution
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Solution Overview
Problem
Existing metallocene catalyst systems for olefin polymerization primarily produce polyolefins with narrow molecular weight distributions, lacking the improved physical properties such as impact resistance and moldability associated with broad molecular weight distributions.
Innovation Solution
The development of an alkyl metalloxane compound containing both alkyl aluminoxane and alkyl galloxane structural units, which serves as a co-catalyst with metallocene compounds to produce polyolefins with broad molecular weight distributions, utilizing a method involving the reaction of trialkyl gallium, trialkyl aluminum, and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a metallocene compound is used as a polymerization catalyst with a conventional co-catalyst such as methyl aluminoxane, then the catalytic activity is maintained, but the molecular weight distribution of the produced polyolefin remains narrow
Solution Approach 1:
The patent combines alkyl aluminoxane and alkyl galloxane structural units into a single co-catalyst molecule, creating a hybrid compound that integrates the properties of both components. This merging approach enables the co-catalyst to simultaneously activate metallocene compounds and modify polymerization behavior, resulting in polyolefins with broad molecular weight distributions while maintaining catalytic activity.
Solution Approach 2:
The co-catalyst is designed as a composite structure containing both aluminum-based (aluminoxane) and gallium-based (galloxane) moieties. This composite material approach allows the single co-catalyst molecule to exhibit multiple functions: activating the metallocene catalyst and controlling polymer chain growth to achieve broad molecular weight distribution, thereby resolving the contradiction between catalytic activity and molecular weight distribution breadth.
2Quantity of substance
If two or more metallocene compounds are used to produce polyolefin with broad molecular weight distribution, then the physical properties are improved, but the device complexity increases
Solution Approach 1:
The patent creates a universal co-catalyst that can work with various metallocene compounds to produce polyolefins with broad molecular weight distributions. This multi-functional co-catalyst eliminates the need for using multiple metallocene compounds, as the hybrid alkyl aluminoxane-galloxane structure itself provides the capability to control molecular weight distribution regardless of the specific metallocene used, thereby reducing catalyst system complexity.
Solution Approach 2:
The patent extracts the molecular weight distribution control function from the metallocene compound selection and transfers it to the co-catalyst structure. By incorporating both aluminoxane and galloxane units into the co-catalyst, the system separates the catalytic activation function (performed by the metallocene) from the molecular weight control function (performed by the hybrid co-catalyst), allowing simpler catalyst systems to achieve broad molecular weight distributions.
3Device complexity
If a conventional co-catalyst system is used, then the catalyst structure is simple, but the resulting polyolefin lacks improved physical properties such as impact resistance and moldability
Solution Approach 1:
The patent merges alkyl aluminoxane and alkyl galloxane structural units into a single co-catalyst molecule, creating a hybrid compound that integrates the properties of both components. This merging approach enables the co-catalyst to simultaneously activate metallocene compounds and modify polymerization behavior, resulting in polyolefins with broad molecular weight distributions while maintaining catalytic activity.
Solution Approach 2:
The co-catalyst is designed as a composite structure containing both aluminum-based (aluminoxane) and gallium-based (galloxane) moieties. This composite material approach allows the single co-catalyst molecule to exhibit multiple functions: activating the metallocene catalyst and controlling polymer chain growth to achieve broad molecular weight distribution, thereby resolving the contradiction between catalytic activity and molecular weight distribution breadth.
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 alkyl metalloxane compound enhances catalytic activity and produces polyolefins with broader molecular weight distributions, improving physical properties like impact resistance and moldability when used in combination with metallocene catalysts.
Implementation Method 1
reacting trialkyl gallium, trialkyl aluminum, and water
Implementation Method 2
reacting trialkyl gallium, trialkyl aluminum, and water
Data Source
AI summary
An alkyl metalloxane compound and a method of producing the same are provided. The alkyl metalloxane compound includes one or more alkyl aluminoxane structural units, and one or more alkyl galloxane structural units per molecule. The method comprises reacting trialkyl gallium, trialkyl aluminum, and water.