N,N-Bis[2-hydroxidebenzyl]amine Catalysts for Olefin Polymerization
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Solution Overview
Problem
Current catalyst systems for olefin polymerization, such as chromium-based, metallocene-based, and Ziegler-Natta systems, face limitations in producing high-quality polyolefins with specific properties, particularly in terms of molecular weight distribution and polymerization efficiency.
Innovation Solution
Development of catalyst compositions employing amine bis(phenolate) or N,N-bis[2-hydroxidebenzyl]amine transition metal compounds, which are used in combination with activator-supports and co-catalysts like organoaluminum compounds to enhance olefin polymerization processes, resulting in improved polymer properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalyst systems (chromium-based, metallocene-based, Ziegler-Natta) are used for olefin polymerization, then commercial viability is achieved, but molecular weight distribution control and polymerization efficiency are limited
Solution Approach 1:
The patent employs transition metal compounds with specific ligand structures (amines, bis(phenolates), beta-diketonates) that fundamentally change the chemical parameters of the catalyst system. These ligand modifications enable precise control over polymerization kinetics and active site characteristics, achieving both high productivity and narrow molecular weight distributions that conventional catalysts cannot simultaneously provide
Solution Approach 2:
The catalyst system combines transition metal compounds with organic ligands (amines, phenolates, beta-diketonates) to create composite catalyst structures. This composite approach integrates the high activity of transition metals with the structural control capabilities of organic ligands, resulting in catalysts that simultaneously achieve high polymerization efficiency and precise molecular weight distribution control
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 use of these catalyst compositions leads to the production of polyolefins with controlled molecular weight distributions and enhanced polymerization efficiency, enabling the creation of high-quality homopolymers and copolymers suitable for various applications.
Implementation Method 1
Catalyst compositions containing N,N-Bis[2-hydroxidebenzyl]amine transition metal compounds for the polymerization of olefins
Data Source
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AI summary
Catalyst compositions containing N,N-bis[2-hydroxidebenzyl]amine transition metal compounds are disclosed. Methods for making these transition metal compounds and for using such compounds in catalyst compositions for the polymerization of olefins also are provided. wherein: M is Ti, Zr, or Hf; X 1 and X2 independently are a monoanionic ligand; each RB and RC independently is a halide, a C1 to C36 hydrocarbyl group, a C1 to C36 halogenated hydrocarbyl group, a C1 to C36 hydrocarboxy group, or a C1 to C36 hydrocarbylsilyl group, wherein p and q independently are 0, 1, 2, 3, or 4; and R A is a C1 to C36 hydrocarbyl group or C1 to C36 halogenated hydrocarbyl group.