ROMP Catalyst Dispersant Composition for Settling Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dispersants for ring opening metathesis polymerization (ROMP) catalysts fail to maintain uniform distribution and stability, leading to catalyst settling and inefficiencies in dispensing and mixing processes.
Innovation Solution
Employing higher viscosity unreactive dispersants with a viscosity of at least 10 Pa·sec at 25°C and 1/sec shear rate, combined with a static mixing element, to prevent catalyst settling and ensure uniform distribution in ROMP reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If low viscosity dispersants are used, then the dispersant flows easily through dispensing apparatus, but the catalyst settles and distribution becomes non-uniform
Solution Approach 1:
The patent changes the viscosity parameter of the dispersant from low to high (at least 10 Pa·sec at 25°C and 1/sec shear rate) to prevent catalyst settling while maintaining compatibility with existing dispensing apparatus. This parameter change resolves the contradiction by prioritizing stability over flowability, as the high viscosity prevents separation while the dispersant remains usable in standard equipment.
Solution Approach 2:
The patent employs composite dispersant systems combining multiple components including high viscosity unreactive dispersants, reactive dispersants, and optionally non-thixotropic fillers. This composite approach maintains catalyst suspension stability while the combination of materials ensures compatibility with dispensing apparatus, resolving the contradiction between flowability and uniform distribution.
2Productivity
If high concentration of unpolymerized cyclic olefin is combined with dispersant, then the reaction efficiency improves, but the dispersant viscosity may decrease and catalyst settling increases
Solution Approach 1:
The patent specifies that the dispersant must maintain a viscosity of at least 10 Pa·sec at 25°C and 1/sec shear rate even when combined with high concentrations of unpolymerized cyclic olefin. This parameter specification ensures that the dispersant maintains sufficient viscosity to prevent catalyst settling while allowing high reaction efficiency, resolving the contradiction between productivity and stability.
Solution Approach 2:
The high viscosity dispersant acts as an intermediary medium that maintains catalyst suspension stability even in the presence of high concentrations of unpolymerized cyclic olefin. The dispersant's specialized properties prevent catalyst settling while allowing the reactive components to mix and react efficiently, resolving the contradiction between reaction efficiency and suspension stability.
3Device complexity
If existing dispersants are used with ROMP catalyst, then the formulation is simple, but the catalyst distribution becomes non-uniform and settling occurs
Solution Approach 1:
The patent changes the key parameter of the dispersant from low viscosity to high viscosity (at least 10 Pa·sec at 25°C and 1/sec shear rate) to prevent catalyst settling. This single parameter change maintains formulation simplicity while dramatically improving reliability and catalyst distribution uniformity, resolving the contradiction between simplicity and reliability.
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 higher viscosity dispersants maintain catalyst stability and uniform distribution, enabling efficient use of existing dispensing and mixing apparatuses, and enhancing the performance of ROMP reactions.
Implementation Method 1
an unreactive dispersant having a viscosity at 25° C. of at least 10 Pa·sec at a shear rate of 1 1/sec
Data Source
AI summary
A composition is described comprising a ring opening metathesis polymerization catalyst or precatalyst thereof; and an unreactive dispersant having a viscosity at 25° C. of at least 10 Pa·sec at a shear rate of 1 1/sec. Also described is a cartridge (e.g. or a dispensing and mixing apparatus) comprising such composition. The cartridge typically comprises a first chamber comprising unpolymerized cyclic olefin; and a second chamber comprising the catalyst and dispersant. Also described are compositions including two-part compositions and methods of bonding a substrate.