Heteroatom Silane Compounds for Curable Polymer Processability
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Solution Overview
Problem
The high reactivity of common methylene-bridged alpha-silanes in RTV formulations shortens the processability time and is undesirable in many applications, as they lead to faster curing and reduced time for achieving advantageous adhesive, curing, or mechanical properties in moisture-curable polymers.
Innovation Solution
The use of silane compounds with a heteroatom bridged to a silicon atom via a sp2-hybridized quaternary carbon atom, which act as end-capping agents, water scavengers, crosslinkers, or adhesion promoters, providing improved adhesive and curing properties in curable compositions, particularly those with silicone-containing terminal groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If methylene-bridged alpha-silanes are used as cross-linking reagents, then curing speed is improved, but processability time is shortened
Solution Approach 1:
The patent changes the chemical structure parameter of the silane compound by replacing the methylene bridge with an sp2-hybridized quaternary carbon atom, which fundamentally alters the reactivity and curing characteristics while maintaining the alpha-silane functionality
Solution Approach 2:
The invention creates a composite molecular structure combining the sp2-hybridized quaternary carbon atom with heteroatom bridging and hydrolysable groups, resulting in a silane compound that balances reactivity and processability
2Strength
If high reactivity silane compounds are used, then adhesive properties are improved, but working time is reduced
Solution Approach 1:
The patent modifies the chemical parameters of the silane compound by introducing sp2-hybridized quaternary carbon atoms with specific heteroatom bridging, which tunes the reactivity to provide both strong adhesive properties and adequate working time
3Productivity
If faster curing is achieved with common alpha-silanes, then production efficiency is improved, but application flexibility is reduced
Solution Approach 1:
The invention changes the chemical structure parameters of the silane compound to achieve an optimal balance between curing speed and application flexibility, allowing both efficient production and adaptability to different application requirements
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
These silane compounds enhance the adhesive, curing, and mechanical properties of moisture-curable polymers by controlling the curing process and extending the processability time, allowing for more flexible and stable polymer networks to form.
Implementation Method 1
at least one silane compound of the general formula (I) containing at least one heteroatom bridged to a silicon atom via a sp2-hybridized quaternary carbon atom
Implementation Method 2
each R1 is independently selected from a hydrolysable group
Implementation Method 3
acting as end-capping agents, water scavengers, crosslinkers, or adhesion promoters
Implementation Method 4
acting as end-capping agents, water scavengers, crosslinkers, or adhesion promoters
Data Source
AI summary
The invention relates to compositions comprising a curable polymer and at least one silane compound having at least one hydrolysable group and at least one heteroatom bridged to a silicon atom via a sp2-hybridized quaternary carbon atom, as defined herein, as well as adhesive, sealing, and coating material comprising the composition and the use of such compositions.