Laminate with Blowing Agent Layer for Residue-Free Detachment
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Solution Overview
Problem
Current adhesive tape solutions for detaching substrates are either non-detachable or damage the substrates, failing to provide a reliable and efficient method for debonding, especially in reworking or recycling of electronic devices, which requires a balance between high bond strength and easy separability.
Innovation Solution
A laminate comprising a first pressure-sensitive adhesive layer, a heatable metal layer, a blowing agent layer, and a second pressure-sensitive adhesive layer, allowing for reliable detachment by exposing the arrangement to a temperature range of 40 to 200°C and inducing heating in an alternating magnetic field, which expands the blowing agent layer to separate the laminate without residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive tape solutions are used to bond substrates, then high bond strength is achieved, but detachment causes damage to substrates or leaves residues
Solution Approach 1:
The adhesive tape is segmented into multiple functional layers: a first pressure-sensitive adhesive layer, a metal layer, a blowing agent layer, and a second pressure-sensitive adhesive layer. This segmentation allows different layers to perform different functions - the adhesive layers provide bonding strength while the blowing agent layer enables clean detachment through expansion, preventing substrate damage and residue formation.
Solution Approach 2:
The blowing agent layer acts as an intermediary between the adhesive layers and substrates. When heated, this intermediate layer expands and creates separation force that detaches the adhesive from substrates cleanly, mediating between the strong bonding function and the detachment function without causing damage or residues.
2Ease of operation
If traditional debonding methods are used, then separation of substrates is achieved, but extensive cleaning is required to remove adhesive remnants
Solution Approach 1:
The blowing agent undergoes a phase transition when heated - it expands from a compact state to a swollen state, creating mechanical force that separates the adhesive layers from substrates. This phase transition enables clean detachment without leaving adhesive remnants, eliminating the need for extensive cleaning operations.
Solution Approach 2:
The adhesive tape is designed as a disposable component where the adhesive layers are intentionally made detachable through the blowing agent mechanism. After use, the entire adhesive tape can be removed cleanly without requiring substrate cleaning, making the adhesive itself the disposable element rather than requiring cleanup of the substrate.
3Productivity
If heat activation is used to detach adhesive bonds, then separation is achieved, but adhesive dissolution takes a very long time
Solution Approach 1:
The detachment process uses periodic action through controlled heating - the blowing agent is heated to a specific temperature range (40-200°C) to trigger expansion, creating a time-efficient detachment process. This controlled periodic heating activates the blowing agent quickly without requiring prolonged adhesive dissolution, achieving fast separation.
Solution Approach 2:
The invention changes the physical parameters of the blowing agent by heating it to a specific temperature range, causing it to expand and create detachment force. This parameter change (temperature-induced expansion) provides a rapid detachment mechanism that is much faster than traditional adhesive dissolution methods, significantly improving productivity.
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
Enables the laminate to be easily and completely detached from substrates without leaving residues, preserving high bond strength and allowing for reuse of substrates without extensive cleaning, thus addressing the limitations of existing debonding technologies.
Implementation Method 1
a metal layer which is heatable by magnetic induction
Implementation Method 2
inducing heating in an alternating magnetic field
Implementation Method 3
exposing the arrangement to a temperature range of 40 to 200°C and inducing heating in an alternating magnetic field, which expands the blowing agent layer to separate the laminate
Data Source
AI summary
A laminate that includes:(i) a first pressure-sensitive adhesive layer, the first layer comprising a block copolymer containing at least one polymer block formed from vinylaromatics and at least one polymer block formed from alkenes;(ii) a metal layer disposed on the first layer;(iii) a blowing agent layer disposed on the metal layer; and(iv) a second pressure-sensitive adhesive layer disposed on the blowing agent layer, the second layer comprising a block copolymer containing at least one polymer block formed from vinylaromatics and at least one polymer block formed from alkenes.