Super Acid Base Catalysts for Tin-Free Polysiloxane Synthesis
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Solution Overview
Problem
Conventional siloxane compositions synthesized via traditional dehydrocondensation reactions are ineffective for producing curable polysiloxane compositions without certain condensation catalysts, such as tin-based catalysts, and/or in the substantial absence of moisture.
Innovation Solution
The use of specific super acid or super base catalysts, including triaza-containing compounds, atrane compounds, and sulfonyl-containing compounds, in the dehydrocondensation reaction between hydride-functionalized siloxanes and hydroxyl-containing compounds to form Si-O-C bonds, which can be used in various applications like agrochemicals, personal care, and coatings without the need for additional condensation catalysts or moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional dehydrocondensation reactions are used without super acid or super base catalysts, then the reaction requires traditional catalysts (such as tin-based catalysts) and moisture, but the invention eliminates the need for these traditional catalysts and moisture by using super acid or super base catalysts instead
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by using super acid or super base catalysts with extremely high acidity or basicity values. This parameter change allows the reaction to proceed without traditional catalysts and moisture, fundamentally altering the reaction conditions to achieve the desired adaptability.
2Object-generated harmful factors
If traditional catalysts are used for dehydrocondensation reactions, then the reaction can proceed, but the invention achieves tin-free catalysis using organic super acid or super base catalysts
Solution Approach 1:
The patent employs organic super acid or super base catalysts that can be used in small amounts and then discarded or neutralized after the reaction. These catalysts replace traditional tin-based catalysts, eliminating the harmful effects of tin while maintaining catalytic effectiveness. The organic nature of these catalysts allows for easier handling and disposal compared to metal-based catalysts.
3Reliability
If moisture is present in the reaction system, then conventional dehydrocondensation can occur, but the invention enables curable polysiloxane composition production in the substantial absence of moisture
Solution Approach 1:
The super acid or super base catalyst acts as an intermediary that enables the dehydrocondensation reaction to proceed without moisture. These catalysts provide an alternative reaction pathway that does not require water as a reactant or byproduct, allowing the reaction to occur in anhydrous conditions while maintaining reliability in producing curable polysiloxane compositions.
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
This approach enables the production of effective curable polysiloxane compositions that can form Si-O-C bonds efficiently, even in the absence of traditional catalysts and moisture, providing a tin-free and versatile solution for various applications.
Implementation Method 1
a catalytically-effective amount of super acid or super base catalyst selected from the group consisting of a triaza-containing compound which contains only carbon, nitrogen and hydrogen atoms, an atrane compound, a linear or branched compound containing a sulfonyl group and a fluoro group, and combinations thereof
Data Source
AI summary
There is provided herein a composition which contains hydri de -functionalized siloxane or silane, a hydroxyl-eontaining compound that does not contain silicon, and a eatalytically effective amount of super acid or super base catalyst selected from the group consisting of a triaza-containing compound which contains only carbon, nitrogen and hydrogen atoms, an atrane compound, a linear or branched compound containing a sulfonyl group and a fluoro group, and combinations thereof. There is also provided a process of making such a composition.