Metal-Oxo Catalyst Solution for Mold Release and Filling
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Solution Overview
Problem
Existing polymerizable compositions produced by transition metal carbene complexes have insufficient mold releasability, impacting productivity.
Innovation Solution
A catalyst solution comprising a metal-oxo complex coordinated with a group -OA(R1R2R3) and β-diketone, along with MoOCl4 and/or WOCl4, in specific amounts, is used to enhance mold releasability and filling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transition metal carbene complexes (Grubbs catalyst, Schrock catalyst) are used as metathesis catalysts, then high catalytic activity and stereospecificity are achieved, but mold releasability of the polymerizable composition is insufficient
Solution Approach 1:
The invention changes the chemical parameters of the catalyst system by transitioning from metal-carbene complexes to metal-oxo complexes with specific ligand structures. This parameter change in catalyst composition fundamentally alters the properties of the polymerizable composition, achieving excellent mold releasability while maintaining high catalytic activity and stereospecificity.
Solution Approach 2:
The invention employs a composite catalyst system consisting of metal-oxo complexes combined with specific ligands (compounds of formulas (2)-(4)) and co-catalysts (MoOCl4 and/or WOCl4). This composite approach creates a synergistic effect that improves mold releasability while preserving the high activity and stereospecificity characteristics of the original metathesis catalysts.
2Reliability
If metal-oxo complex with compound of formula (1) is used as catalyst, then mold releasability is improved, but filling properties need optimization
Solution Approach 1:
The invention optimizes filling properties by adjusting the ligand structure parameters (R1-R6 groups, A atom selection) and catalyst composition ratios. These parameter changes allow the catalyst system to achieve both excellent mold releasability and improved filling properties in the polymerizable composition.
Solution Approach 2:
The invention introduces local quality variations through the diverse substituent groups (R1-R6) and atom types (A) in the ligand structure. Different regions of the ligand molecule can be optimized independently to achieve specific local properties that contribute to both mold releasability and filling characteristics of the overall polymerizable composition.
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 catalyst solution provides polymerizable compositions with excellent mold releasability and filling properties, improving production efficiency and stability.
Implementation Method 1
Transition metal carbene complexes such as ruthenium carbene complexes that are referred to as Grubbs catalyst and molybdenum carbene complexes and tungsten carbene complexes that are referred to as Schrock catalyst are known as highly active catalysts for metathesis reactions
Data Source
Figure 1
AI summary
Provided is a catalyst solution comprising a metal-oxo complex represented by the general formula (1) below and at least one of MoOCl4 and WOCl4, wherein the total content of MoOCl4 and WOCl4 is 0.5 to 20 parts by weight with respect to 100 parts by weight of the metal-oxo complex: wherein in the above general formula (1), "M" represents a molybdenum atom or a tungsten atom; "A" represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom; R1 to R5 each independently represent a hydrogen atom, a straight or branched chain alkyl group that is substituted or unsubstituted and has 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms; and R1 to R3 may be bonded to one another to form a ring.