(Meth)acrylate Structural Adhesive with Cyclic Imide Monomer
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Solution Overview
Problem
Existing structural adhesives face challenges in achieving strong, flexible bonds, especially between glass substrates, with high impact resistance and resistance to hydrolysis, often requiring primers and experiencing bond failure due to rigid bonds and high stress concentrations.
Innovation Solution
A curable (meth)acrylate structural adhesive composition comprising a cyclic imide-containing monomer, a crosslinker, and a cure initiator system, which forms a flexible bond without the need for primers, offering high adhesion, elongation, and impact resistance, even on untreated substrates, and resisting hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastomeric materials are incorporated to enhance flexibility and toughness, then impact resistance is improved, but viscosity increases leading to handling challenges
Solution Approach 1:
The patent changes the chemical structure parameters of the adhesive by using specific acrylate monomers with controlled molecular weights and functional groups, achieving the desired flexibility and impact resistance without relying on elastomeric additives that would increase viscosity. The molecular weight and functional group composition are carefully selected to balance performance and handleability.
2Strength
If rigid bonds are formed for strong adhesion, then bond strength is improved, but stress concentration increases leading to bond failure
Solution Approach 1:
The patent creates a flexible bond line by selecting acrylate monomers that form a cured adhesive with appropriate elasticity and elongation properties. This flexible bond acts as a stress-distributing layer that prevents stress concentration at the edges, thereby improving bond durability while maintaining strength.
3Productivity
If acrylate adhesives are used for rapid curing, then productivity is improved, but resistance to hydrolysis deteriorates
Solution Approach 1:
The patent uses a composite approach by combining multiple acrylate monomers with different functional groups and hydrolysis resistances. This creates a synergistic effect where the cured adhesive maintains rapid curing characteristics while the specific monomer combination provides enhanced resistance to hydrolysis and transesterification reactions.
4Strength
If primers are used to achieve good adhesion to glass, then adhesion is improved, but device complexity increases
Solution Approach 1:
The patent develops a universal acrylate adhesive composition that can adhere directly to glass and other substrates without requiring surface treatment or primer applications. The adhesive formulation contains functional groups that provide universal adhesion capability across different substrate types, eliminating the need for additional primer steps and simplifying the overall bonding process.
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 adhesive composition provides strong, flexible bonds with high adhesion and impact resistance, maintaining integrity under heat and humidity, and enabling rework of bonded parts without surface treatment, suitable for applications in automotive, aerospace, and electronic devices.
Implementation Method 1
a cure initiator system
Implementation Method 2
a crosslinker; wherein the crosslinker is a compound represented by the formula: L-(R1)q
Implementation Method 3
such adhesives when used on glass are easily degraded by high humidity conditions via transesterification reactions and hydrolysis
Data Source
AI summary
Provided are curable (meth)acrylate structural adhesive compositions comprising a cyclic imide-containing (meth)acrylate monomer and a crosslinker, and methods, particularly methods of use.