Fluorene Derivative Catalyst for Olefin Polymerization
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Solution Overview
Problem
Current metallocene compounds for olefin polymerization lack effectiveness in terms of polymerization activity, stereoregularity, and molecular weight, particularly with unsaturated bonds at specific positions on the fluorene ring, which are unexplored in existing catalysts.
Innovation Solution
A transition metal compound with a fluorene ring derivative containing an unsaturated bond at the 3- and 6-positions, used as a catalyst for olefin polymerization, combined with organometallic compounds and organoaluminum oxy-compounds to enhance polymerization activity and molecular weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metallocene compounds are used for olefin polymerization, then the polymerization process is well-established, but the polymerization activity, stereoregularity, and molecular weight are insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the metallocene compound by introducing unsaturated bonds at specific positions (3- and 6-positions) of the fluorene ring, and by modifying substituent groups. This structural parameter change leads to improved polymerization activity while maintaining or enhancing stereoregularity and molecular weight of the resulting polymer
Solution Approach 2:
The patent creates a composite catalyst system by combining the novel metallocene compound with specific ligand structures featuring unsaturated bonds and substituted fluorene rings. This composite molecular structure achieves synergistic effects that improve polymerization performance beyond what conventional single-structure catalysts can achieve
2Manufacturing precision
If substituents are introduced on cyclopentadienyl rings or fluorene rings to improve stereoregularity, then the molecular weight decreases
Solution Approach 1:
The patent optimizes the substitution pattern parameters by placing unsaturated bonds at specific positions (3- and 6-positions) of the fluorene ring rather than on the cyclopentadienyl rings. This positional parameter change allows maintenance of molecular weight while achieving high stereoregularity in the polymer product
3Quantity of substance
If the bridging part is replaced with diphenylmethylene bridge to improve molecular weight, then the stereoregularity may be affected
Solution Approach 1:
The patent creates a composite ligand structure combining cyclopentadienyl rings with substituted fluorene rings containing unsaturated bonds. This composite structure achieves both high molecular weight and high stereoregularity by distributing the structural features across different parts of the ligand system rather than relying on a single bridging group
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 catalyst system achieves high activity in producing olefin polymers with improved stereoregularity and molecular weight, offering a more efficient process for olefin polymerization.
Implementation Method 1
a transition metal compound which is useful as a catalyst component for olefin polymerization
Data Source
AI summary
Provided is a novel fluorene derivative which is useful as a catalyst component for olefin polymerization, a transition metal compound containing the fluorene derivative as a part of ligand, a catalyst for olefin polymerization containing the transition metal compound, and a process for producing olefin polymer. The fluorene derivative is characterized by being represented by the following general formula [I]: wherein R1, R2, R3, R5, R6, R7, R8, R9, R10, R11, R12, and R14 are each selected from hydrogen, a hydrocarbon group, and a silicon-containing group, and may be the same as or different from each other, R4 and R13 are each selected from hydrogen, a hydrocarbon group, a silicon-containing group, a sulfur-containing group, an oxygen-containing group, a nitrogen-containing group, and a halogen-containing group, and may be the same as or different from each other, and adjacent substituents of R1 to R14 may be bonded to each other to form a ring, except that the case where R4 and R5, and R12 and R13 are each bonded to each other to form a vinylene group. Also provided is a bridged metallocene compound having both of the skeleton and a cyclopentadiene skeleton.