Carbamate Lewis Base for Stereoregular Propylene Polymerization
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Solution Overview
Problem
There is a need for a propylene polymer with higher stereoregularity and high productivity, as well as a catalyst component that can achieve this efficiently, to meet market demands and environmental considerations.
Innovation Solution
A carbamate compound with a specific structure is used as a Lewis base in a solid titanium catalyst component, enhancing the stereoregularity and productivity of propylene polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional Lewis bases are used in solid titanium catalyst components, then basic catalytic activity is achieved, but stereoregularity and productivity cannot be simultaneously optimized
Solution Approach 1:
The invention changes the chemical structure parameters of the Lewis base by introducing a specific carbamate compound structure with defined molecular formula characteristics (where n is 2 to 4). This structural parameter change enables the catalyst to achieve both high stereoregularity and high productivity simultaneously, resolving the contradiction between manufacturing precision and productivity.
Solution Approach 2:
The invention creates a composite catalyst system by combining titanium tetrachloride, magnesium compound, and the specifically structured carbamate compound (Formula 0). This composite material approach allows the catalyst component to exhibit synergistic effects that simultaneously improve stereoregularity and polymerization activity, overcoming the limitations of conventional single-function Lewis bases.
2Strength
If propylene polymer with higher stereoregularity is produced, then physical properties such as rigidity and heat resistance are improved, but production cost and complexity increase
Solution Approach 1:
The invention applies local quality by introducing specific functional groups (carbamate groups with defined substitution patterns) at particular positions in the Lewis base molecule. This localized structural modification achieves high stereoregularity and improved physical properties without requiring complex overall catalyst structures, thus avoiding increased device complexity.
Solution Approach 2:
The carbamate compound structure is segmented into distinct functional regions: the core carbamate group (Formula 0) provides stereoregularity control, while the substituent groups (R1, R2, R3) can be independently optimized for other properties. This segmentation allows each part to contribute specifically to performance without increasing overall system complexity.
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 carbamate compound improves the activity, stereospecificity, and molecular weight controllability of the solid titanium catalyst, resulting in propylene polymers with high stereoregularity and broad molecular weight distribution.
Implementation Method 1
a carbamate compound having a specific structure is suitable as, for example, a Lewis base for a solid titanium catalyst component
Data Source
AI summary
A carbamate compound represented by the following formula (0). wherein l is 0 or 1, m is an integer of 1 to 4, n is an integer of 1 to 4, R1 and R2 are substituents having a "R10-CR2-" structure, R3 is a hydrogen atom or a substituent having a "R10-CR2-" structure, R4 is a substituent selected from a substituent having a "R10-CR2-" structure, a substituent having a "R10-At16-" structure, and a substituent having a "R102-At15-" structure, At15 is a Group 15 atom, At16 is a Group 16 atom, R and R10 are each a group containing an atom selected from carbon, hydrogen, and Groups 15, 16, and 17 elements, which has 0 to 17 carbon atoms and 0 to 4 heteroatoms, R1 to R4 and R may bond to each other to form a monocyclic or polycyclic ring, and R and R10 may bond to each other to form a monocyclic ring, a polycyclic ring, or a multiple bond.