Eugenol Polyethersiloxanes via DMC Catalysis
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Solution Overview
Problem
Conventional methods for producing polyethers and polyethersiloxanes using alcoholic starters often result in products that are not food-conformant and have high migration issues, with many not meeting the criteria for low toxicity and stability, particularly due to the rearrangement of eugenol into isoeugenol during alkaline-catalyzed alkoxylation, which limits their use in food packaging and other applications.
Innovation Solution
A process involving the use of eugenol as a starter in DMC-catalyzed alkoxylation reactions, where the allyl group remains intact, producing eugenol-based polyethers that are then reacted with SiH-functional siloxanes to form stable and hydrosilylatable polyethersiloxanes, avoiding the formation of isoeugenol and ensuring low molecular weight distribution and high stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If alkaline-catalyzed alkoxylation is used to produce polyethers from eugenol, then polyether production is achieved, but the terminal double bond rearranges to form isoeugenol, losing stability and reactivity
Solution Approach 1:
The patent changes the catalytic parameter from alkaline catalyst to DMC (double metal cyanide) catalyst, which fundamentally alters the reaction mechanism. This parameter change prevents the base-catalyzed isomerization of the terminal double bond while maintaining efficient polyether production, thus resolving the contradiction between productivity and stability.
2Productivity
If conventional alcoholic starters are used in polyether production, then production efficiency is improved, but food safety and low migration criteria are not met
Solution Approach 1:
The patent changes the chemical parameter of the starter material from conventional alcoholic starters to eugenol, which has favorable toxicological properties and low migration behavior. This parameter change maintains production efficiency while meeting food safety requirements for contact materials.
3Manufacturing precision
If eugenol is used as starter in DMC-catalyzed alkoxylation, then homogeneous products with narrow molecular weight distribution are obtained, but the process complexity increases
Solution Approach 1:
The patent changes the catalytic parameter to DMC catalyst, which provides excellent control over the alkoxylation reaction. This results in homogeneous polyether products with narrow molecular weight distribution and low polydispersity, achieving high manufacturing precision despite increased process complexity.
4Adaptability or versatility
If the terminal double bond is retained in eugenol polyether, then hydrosilylation reactions become possible, but the risk of unwanted side reactions increases
Solution Approach 1:
The patent uses DMC catalyst as an intermediary that enables controlled alkoxylation without affecting the terminal double bond. This intermediary approach preserves the double bond for subsequent hydrosilylation reactions while preventing unwanted side reactions during the alkoxylation step, thus balancing versatility 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 process yields homogeneous, stable eugenol-based polyethersiloxanes with narrow molecular weight distribution, enabling their use as effective surface-active substances and dispersants while ensuring compliance with food contact regulations by preventing migration and maintaining the integrity of the terminal double bond, thus enhancing their chemical reactivity and commercial viability.
Implementation Method 1
the use of eugenol as a starter in the DMC-catalyzed production of polyethers
Implementation Method 2
reaction of the SiH-functional siloxanes with at least one eugenol-based polyether from step 1 to form at least one SiC link
Data Source
AI summary
The present invention relates to a process for producing eugenol-based polyethers that can be hydrosilylated, their conversion to polyether siloxanes, as well as to products which can be produced according to said method and to their use as substances active on the boundary surface.