Two-Phase Polyacrylate Elastomer Adhesive for Window Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing adhesives for protecting display modules and optical lenses in electronic devices often fail to balance high push-out strength, impact resistance, and reworkability, especially at low temperatures, while also providing good adhesion to low-polarity substrates and heat resistance.
Innovation Solution
A composite adhesive comprising 60-90% polyacrylate-based polymer and 10-40% elastomer-based polymer components, which are not miscible, forming a two-phase morphology with a polyacrylate matrix and elastomer domains, enhancing push-out strength, impact resistance, and reworkability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass sheets are used as protective windows, then scratch resistance and UV resistance are improved, but impact resistance and safety are worsened due to brittleness and splintering
Solution Approach 1:
The patent uses glass sheets combined with polymer adhesive layers to create a composite protective window system. The glass provides scratch resistance and UV resistance, while the polymer adhesive layers absorb impact energy and prevent splintering, thus resolving the contradiction between scratch resistance and impact resistance
2Reliability
If polymer sheets are used as protective windows, then impact resistance and safety are improved, but scratch resistance and UV resistance are worsened
Solution Approach 1:
The patent combines polymer sheets with glass layers or adhesive modifications to create a composite structure where the polymer provides impact resistance while the glass or modified adhesive layers provide scratch resistance and UV resistance, resolving the contradiction between these properties
3Strength
If high push-out strength adhesives are used for bonding windows, then bond strength is improved, but reworkability and disassembly ease are worsened
Solution Approach 1:
The patent employs adhesives with dynamic properties that allow strong bonding under normal conditions but enable controlled disassembly under specific conditions (such as heat application or solvent exposure), thus resolving the contradiction between bond strength and reworkability
4Strength
If adhesives with high adhesion to low-polarity substrates are used, then adhesive bonding is improved, but compatibility with polar substrates and processing flexibility are worsened
Solution Approach 1:
The patent modifies adhesive parameters such as surface tension, polarity, and chemical composition to achieve high adhesion to low-polarity substrates while maintaining compatibility with polar substrates, thus resolving the contradiction between adhesive power and substrate compatibility
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 achieves high bond strengths, impact resistance, and reworkability, meeting conditions such as push-out strength ≥80 N, impact strength ≥150 cm, and heat resistance ≥150°C, while maintaining adhesion to low-polarity substrates.
Implementation Method 1
an adhesive layer arranged to join the first substrate to the second substrate
Implementation Method 2
a composite adhesive comprising 60-90% polyacrylate-based polymer and 10-40% elastomer-based polymer components, which are not miscible, forming a two-phase morphology with a polyacrylate matrix and elastomer domains
Data Source
AI summary
Composite made of two substrates for use for optical, electronic and/or precision-engineered equipment, comprising a first substrate and a second substrate and, arranged so as to connect the first substrate to the second substrate, an adhesive layer, wherein the adhesive layer comprises an adhesive which has, relative to the mixture, (a) from 60% by weight to 90% by weight of a first polymer component based on polyacrylate and (b) from 10% by weight to 40% by weight of a second polymer component based on elastomers, where the second polymer component is essentially not miscible with the first polymer component, so that the adhesive is present in at least two separate phases in the adhesive layer.