Iodonium Salt Acrylate Adhesive Stability
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Solution Overview
Problem
Existing (meth)acrylic compositions face storage stability issues and compromise between reactivity and stability, particularly in two-component systems used for adhesive bonding, where peroxide-based redox systems are common but prone to instability.
Innovation Solution
A crosslinkable two-component composition comprising an iodonium salt, (meth)acrylate monomer, organic or mineral acid, and dihydropyridine compound, excluding peroxides, which improves stability and reactivity, allowing for effective adhesive bonding in various industrial applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a peroxide/tertiary amine redox system is used to initiate polymerization, then reactivity is improved, but storage stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the redox system by replacing peroxide with iodonium salt as the oxidizing agent. This parameter change maintains polymerization reactivity while dramatically improving storage stability, as iodonium salts are more stable compounds that do not decompose prematurely like peroxides do
Solution Approach 2:
The patent employs a two-component system where component A (iodonium salt + acid) and component B (dihydropyridine) are kept separate during storage and only mixed before use. This disposable approach to the redox system eliminates storage stability issues while maintaining reactivity when needed
2Power
If a two-component system with peroxide is used, then adhesive reactivity is improved, but storage stability and shelf life worsen
Solution Approach 1:
The patent modifies the chemical composition parameters by substituting peroxide-based oxidizing agents with iodonium salt, which has different stability characteristics. This parameter change allows the adhesive to maintain high reactivity upon mixing while achieving superior storage stability and extended shelf life
Solution Approach 2:
The patent introduces an organic or mineral acid as an intermediary component that facilitates the redox reaction between iodonium salt and dihydropyridine. This intermediary enables controlled polymerization initiation while maintaining system stability during separate storage of components
3Productivity
If conventional peroxide systems are used for crosslinking, then crosslinking speed is improved, but storage stability and handling safety deteriorate
Solution Approach 1:
The patent uses a two-component system where the reactive iodonium salt/dihydropyridine redox system is only activated when components are mixed immediately before application. This eliminates safety hazards and storage stability issues associated with peroxides while maintaining fast crosslinking speed when needed
Solution Approach 2:
The patent changes the chemical nature of the oxidizing agent from peroxide to iodonium salt, which fundamentally alters the stability and safety parameters of the system. Iodonium salts are non-explosive, non-shock-sensitive, and chemically stable during storage, yet still provide rapid crosslinking when activated
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 composition provides a stable and reactive adhesive system with improved storage stability and rapid crosslinking, ensuring strong adhesive properties and increased productivity in applications like transportation, electronics, and construction.
Implementation Method 1
Radical polymerization is typically initiated by a redox system which, by means of an oxidation-reduction reaction, results in the production of radicals
Implementation Method 2
They are used as adhesives, mastics and coatings. Radical polymerization is typically initiated by a redox system
Data Source
AI summary
The present invention relates to a crosslinkable two-component composition comprising:a component A comprising:an iodonium salt having one of the formulae (I-A), (I-B) or (I-C);at least one (meth)acrylate monomer M1 having one of the formulae (II), (III) or (IV);an organic or mineral acid having a pKa or pKa1 ranging from 0.3 to 5 measured in water at 25° C.;a copper salt or a copper complex;a component B comprising at least one dihydropyridine compound having one of the formulae (VI) to (X);said composition not comprising any peroxide.