Multimodal Polyethylene Design for Enhanced Performance
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Summary
Problems
There is a need for improved catalyst systems to produce multimodal polyethylene resins with specific molecular weight distributions and properties for enhanced performance and processing characteristics.
Innovation solutions
A polymer reactor blend comprising a first component with a polydispersity index greater than 20 and a second component with a polydispersity index less than 20, using a catalyst composition that includes an imine (bis)phenolate compound and a metallocene complex, which is used to polymerize ethylene and 1-hexene, resulting in a polymer with tailored molecular weight distribution and short-chain branching.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a single catalyst system is used for polymerization, then the production process is simple, but the molecular weight distribution cannot be controlled to achieve multimodal properties
Why choose this principle:
The patent divides the catalyst system into multiple distinct catalyst compositions, each with specific ligand structures (e.g., structures I-IV with different R groups). Each catalyst composition targets a specific molecular weight range, enabling precise control over the multimodal molecular weight distribution of the polyethylene resin.
Principle concept:
If a single catalyst system is used for polymerization, then the production process is simple, but the molecular weight distribution cannot be controlled to achieve multimodal properties
Why choose this principle:
Different catalyst compositions are assigned specific ligand configurations (Structure I with R1-R6 groups, Structure II with R7-R12 groups, etc.) to produce polymer fractions with tailored properties. Each catalyst composition locally optimizes for specific molecular weight and branching characteristics, which are then combined to achieve overall multimodal properties.
Application Domain
Data Source
AI summary:
A polymer reactor blend comprising a first component with a polydispersity index greater than 20 and a second component with a polydispersity index less than 20, using a catalyst composition that includes an imine (bis)phenolate compound and a metallocene complex, which is used to polymerize ethylene and 1-hexene, resulting in a polymer with tailored molecular weight distribution and short-chain branching.
Abstract
A polymer reactor-blend comprising at least a first component having a polydispersity index of greater than about 20 and is present in an amount of from about 1 wt. % to about 99 wt. % based on the total weight of the polymer and a second component having a polydispersity index of less than about 20 and is present in an amount of from about 1 wt. % to about 99 wt. % based on the total weight of the polymer wherein a molecular weight distribution of the second component lies within a molecular weight distribution of the first component.