Two-Component Methacrylate Composition Without Peroxides
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Solution Overview
Problem
Existing (meth)acrylic compositions face challenges in achieving a balance between reactivity and storage stability, particularly in adhesive applications, and often require peroxide-based redox systems that can be unstable during storage.
Innovation Solution
A crosslinkable two-component composition is developed, comprising an iodonium salt, (meth)acrylate monomer, organic or mineral acid, and photoinitiator, without peroxides, using a dihydropyridine compound in Component B to enhance reactivity and stability, allowing for efficient adhesive bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
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 removes the peroxide component from the redox system, extracting the problematic element that causes storage instability while retaining the essential polymerization initiation function through alternative photoinitiators and redox couples that do not compromise storage stability
Solution Approach 2:
The patent changes the chemical parameters of the initiation system by replacing peroxide with alternative redox-active species and photoinitiators, fundamentally altering the initiation mechanism from thermal/redox-based to light-assisted redox-based, thereby improving storage stability while maintaining reactivity
2Productivity
If rapid polymerization is achieved for high productivity, then drying time is reduced, but adhesive bonding quality may deteriorate
Solution Approach 1:
The patent applies preliminary action by using a photoinitiator system that enables controlled, rapid polymerization upon light exposure, allowing the adhesive to set quickly without compromising bonding quality, as the light-triggered reaction ensures uniform and complete curing
Solution Approach 2:
The patent substitutes the traditional thermal or chemical initiation mechanism with a photoinitiation system, replacing time-dependent thermal diffusion with light-driven electron transfer, thereby achieving rapid and controlled polymerization that maintains adhesive integrity while reducing drying time
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 good compromise between storage stability and reactivity, with rapid drying and excellent adhesive properties, eliminating the need for peroxides and improving industrial process productivity.
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
at least one photoinitiator P1
Implementation Method 3
Radical polymerization is typically initiated by a redox system which, by means of an oxidation-reduction reaction, results in the production of radicals
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;an organic or mineral acid having a pka or pka1 ranging from 0.3 to 5 measured in water at 25° C.;at least one photoinitiator P1;a component B comprising at least one dihydropyridine compound having one of the formulae (III) to (VI);said composition not comprising any peroxide.