Hydroxymethylcarboxamido-Substituted Silanole for Stable Polymers
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Solution Overview
Problem
Hydroxysilanes are challenging to produce in high purity and exhibit poor storage stability due to self-condensation, limiting their use in silane-functional polymers, which are needed for applications like adhesives and coatings.
Innovation Solution
A hydroxysilane of the formula (I) is synthesized using readily available commercial raw materials, with a hydroxyl group of high reactivity and improved storage stability, allowing it to be used as an adhesion promoter and crosslinker in curable compositions, particularly reacting with isocyanates to form thermally stable silane-functional compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydroxysilanes are produced using conventional methods, then they can be used as adhesion promoters and crosslinkers, but they exhibit poor storage stability due to self-condensation and low purity
Solution Approach 1:
The patent changes the chemical structure parameters by introducing a hydroxymethylcarboxamido group with specific substituents (R1a, R1b, R2, R3) that modify the reactivity and stability characteristics of the hydroxysilane, enabling high purity production and improved storage stability simultaneously
Solution Approach 2:
The patent creates a composite molecular structure combining silane group, hydroxyl group, and hydroxymethylcarboxamido group in a specific configuration that prevents self-condensation while maintaining reactivity, achieving both high purity and storage stability
2Ease of manufacture
If mercaptosilanes are used to form silane-functional compounds with isocyanates, then the compounds can be produced easily, but they have unpleasant odor and form thiourethanes with low thermal stability
Solution Approach 1:
The patent changes the functional group from mercapto to hydroxymethylcarboxamido, fundamentally altering the chemical parameters to achieve high thermal stability in the resulting urethane bonds while eliminating unpleasant odors and maintaining ease of manufacture
3Ease of manufacture
If aminosilanes are used to form silane-functional compounds with isocyanates, then the compounds can be produced easily, but they form ureas with high viscosity and limited heat resistance
Solution Approach 1:
The patent changes the amino group to a hydroxymethylcarboxamido group, modifying the chemical parameters to produce urethanes with moderate viscosity and superior heat resistance, while maintaining ease of conversion with isocyanates
4Ease of manufacture
If known hydroxysilanes from US Pat. No. 5,587,502 are used, then they can be produced, but they are of too low purity and have low hydroxyl group reactivity
Solution Approach 1:
The patent changes the molecular structure by introducing the hydroxymethylcarboxamido substituent with specific radical configurations that enhance both the purity of the product and the reactivity of the hydroxyl group, overcoming the limitations of previously known hydroxysilanes
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 hydroxysilane enables the production of silane-functional polymers with excellent strength, elasticity, and heat resistance, providing effective adhesion to various substrates and maintaining stability over time.
Implementation Method 1
reacting it with isocyanates to form thermally stable silane-functional compounds
Implementation Method 2
They serve, among other things, as adhesion promoters or crosslinkers
Implementation Method 3
crosslinkable by means of moisture
Implementation Method 4
The polymers obtained in this way quickly cure with moisture to form elastic materials
Data Source
AI summary
The present invention relates to specific hydroxysilanes of formula (I), a method for the production thereof, the use thereof as a constituent of moisture-curing compositions, and silane-functional compounds produced therefrom, in particular silane-functional polymers and isocyanatosilanes. The hydrosilanes can be produced in a simple process with a high degree of purity and are storage-stable after production. Production from the reaction of lactides with aminosilanes is particularly advantageous. Hydroxysilane of formula (I), where n is 1 or 2. The other variables are as defined in the claims.