Heteroatom-Containing Silane Resins for Controlled Curing
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Solution Overview
Problem
The high reactivity of common methylene-bridged alpha-silanes in RTV formulations shortens the time of processability and is undesirable in many applications, as it leads to faster curing and reduced time for processing.
Innovation Solution
Development of silane resin oligomers with hydrolysable groups and heteroatoms bridged to silicon via sp2-hybridized quaternary carbon atoms, which are used as end-capping agents, crosslinkers, and adhesion promoters in curable compositions, particularly in moisture-curable polymers, to provide improved adhesive, curing, and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If methylene-bridged alpha-silanes are used as crosslinking reagents, then curing speed is improved, but processability time is reduced
Solution Approach 1:
The patent changes the chemical structure parameter of the silane compound by replacing the methylene bridge (—CH2—) with an sp2-hybridized quaternary carbon atom structure. This structural parameter change modifies the reactivity of the silane, reducing its curing speed compared to conventional methylene-bridged alpha-silanes, thereby extending the processability time while still maintaining effective crosslinking capability.
Solution Approach 2:
The invention creates a composite molecular structure combining the sp2-hybridized quaternary carbon atom framework with heteroatom substituents (X = O, S, N, or P) and hydrolysable groups (R1). This composite structure achieves a balance between reactivity and processability, where the heteroatoms provide controlled hydrolysis and crosslinking rates, and the sp2-carbon framework provides structural stability and extended working time.
2Duration of action of moving object
If high reactivity silanes are used, then curing time is reduced, but processing time is shortened
Solution Approach 1:
The patent modifies the reactivity parameter of the silane compound by introducing the sp2-hybridized quaternary carbon atom structure with heteroatom substituents. This parameter change reduces the initial reactivity compared to methylene-bridged silanes, allowing sufficient processing time for application and adjustment, while still achieving complete curing within a reasonable time frame.
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 resin oligomers offer advantageous adhesive and curing properties, allowing for controlled curing and extended processability while maintaining mechanical integrity in silicone-containing polymers.
Implementation Method 1
obtainable by condensation of at least one first silane of the formula Si(RA)(R4)(R1)2 with at least one second silane of the formula Si(RA)(R1)3
Implementation Method 2
each R1 is independently selected from a hydrolyzable group
Data Source
AI summary
The invention relates to oligomers of silane compounds 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, a process for preparing such silane compound resins, the use thereof, for example as end-capping agent, crosslinker, and/or adhesion promoter in curable compositions, and curable compositions containing these resins as well as the use of such compositions.