THQ-Based Cure Accelerators for Anaerobic Adhesives
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Solution Overview
Problem
There is a need for alternative anaerobic cure accelerators to differentiate existing products, ensure supply continuity, and replace conventional accelerators that have come under regulatory scrutiny, while maintaining comparable cure speeds and physical properties in anaerobic adhesive and sealant compositions.
Innovation Solution
The use of THQ-based or indoline-based adducts as cure accelerators, specifically within the structure A framework, which includes compounds derived from reacting THQ or indoline with alkylating agents, alkenylating agents, or alkarylating agents, providing a reaction product with pendant functional groups that can replace conventional accelerators like toluidines and APH in anaerobic curable compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional accelerators (saccharin, APH, toluidines) are used in anaerobic adhesive compositions, then cure speed and physical properties are maintained at acceptable levels, but regulatory scrutiny increases and supply continuity is compromised
Solution Approach 1:
The patent changes the chemical structure parameters of the accelerator from conventional saccharin/APH/toluidine structures to new heterocyclic structures (structures A and B with specific nitrogen-containing rings and functional groups). This structural parameter change enables the new accelerators to bypass regulatory restrictions while maintaining the essential accelerator function of initiating and speeding up anaerobic cure of (meth)acrylate compositions.
Solution Approach 2:
The patent introduces alternative accelerator compounds that are readily available, cost-effective replacements for regulated materials. These new accelerators (structures A and B) are designed to be commercially viable substitutes that ensure continuous supply without relying on materials under regulatory scrutiny, effectively replacing 'expensive/restricted' conventional accelerators with 'affordable/available' alternatives.
2Reliability
If alternative cure accelerators are introduced to replace conventional accelerators, then supply continuity and regulatory compliance are improved, but cure speed and physical properties may be compromised
Solution Approach 1:
The patent optimizes the chemical structure parameters of the new accelerators (structures A and B) to match or exceed the performance of conventional accelerators. By adjusting ring structures, functional groups, and molecular configurations, the new accelerators achieve comparable or superior cure speeds and physical properties while maintaining supply continuity and regulatory compliance.
Solution Approach 2:
The patent creates new accelerator molecules that copy the essential functional characteristics of conventional accelerators (saccharin, APH, toluidines). The new structures (A and B) replicate the key accelerator functions—initiating free radical generation and speeding up polymerization—through analogous chemical mechanisms, ensuring that cure performance is maintained while replacing the restricted substances.
3Reliability
If new accelerator structures (structures A and B) are used, then regulatory compliance and product differentiation are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the complex accelerator molecule into modular structural components (heterocyclic rings, functional groups, substituent positions). This segmentation allows for systematic synthesis through stepwise chemical reactions, where standard building blocks are assembled into the final accelerator structures (A and B), simplifying the manufacturing process despite the molecular complexity.
Solution Approach 2:
The patent designs the new accelerator structures (A and B) with universal synthetic routes that can produce multiple specific compounds within the structure families. The core heterocyclic frameworks and functional group arrangements serve as universal precursors that can be adapted to create various specific accelerator molecules, reducing overall manufacturing complexity through standardized synthesis pathways.
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 THQ-based or indoline-based adducts as cure accelerators offer comparable cure speeds and physical properties to conventional systems, providing a viable alternative that reduces reliance on regulated materials and ensures supply continuity, while enhancing the performance of anaerobic adhesives and sealants.
Implementation Method 1
Conventional anaerobic adhesives ordinarily include a free-radically polymerizable acrylate ester monomer, together with a peroxy initiator
Data Source
AI summary
The present invention relates to cure accelerators useful for anaerobic curable compositions, such as adhesives and sealants.