Electrolyte Adhesive Tape for Strong Bonding and Electrical Release
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Solution Overview
Problem
Existing adhesive technologies for electronic devices struggle to provide high initial adhesive strength and shear strength while allowing for easy and clean removal, often requiring complex and time-consuming processes like solvent dissolution or heat-mediated separation.
Innovation Solution
An adhesive compound comprising a blend of poly(meth)acrylate and vinyl aromatic block copolymer with an electrolyte, particularly ionic liquids, that can be electrically detached by applying a voltage, maintaining high adhesive strength before detachment and improving both static and dynamic shear strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If heat-mediated separation is used to reduce adhesive cohesion, then manual separation becomes possible, but extensive rework is required to clean adhesive residue from the substrate
Solution Approach 1:
The patent replaces heat-mediated mechanical separation with an electrical field-based separation mechanism. By incorporating electrolytes into the adhesive composition, the adhesive can be removed by applying an electrical voltage that triggers electrochemical reactions, eliminating the need for heat application and subsequent mechanical cleaning operations.
Solution Approach 2:
The patent changes the removal mechanism from thermal parameter control to electrical parameter control. The adhesive composition is formulated with electrolytes that remain stable during bonding but become active when electrical voltage is applied, enabling transition from bonded state to removable state through electrical parameter change rather than thermal parameter change.
2Reliability
If adhesive-dissolving technologies are used to achieve high bond strength, then reliable bonding is achieved, but the removal process takes a very long time
Solution Approach 1:
The patent replaces slow chemical dissolution processes with rapid electrical field-induced electrochemical reactions. The electrolyte-containing adhesive maintains strong bonds through normal adhesion mechanisms but allows rapid removal when electrical voltage triggers electrochemical decomposition, reducing removal time from hours to minutes or seconds.
Solution Approach 2:
The patent implements a two-stage process where the adhesive operates in a stable bonding mode during normal use, then transitions to a rapid removal mode when electrical voltage is applied. This periodic switching between stable and reactive states enables both high reliability during bonding and rapid removal when needed.
3Ease of operation
If electrolyte is added to enable electrical removal, then residue-free detachment is achieved, but the adhesive composition becomes more complex
Solution Approach 1:
The patent merges the adhesive functionality with electrochemical removal functionality by incorporating electrolytes directly into the adhesive composition. This combination allows the same material to provide both strong bonding through adhesion and easy removal through electrochemical reactions when voltage is applied, eliminating the need for separate removal agents or systems.
Solution Approach 2:
The patent creates a multi-functional adhesive material that simultaneously provides bonding strength, electrical conductivity for removal activation, and residue-free detachment. The electrolyte-containing adhesive composition serves multiple purposes: maintaining bond integrity during use and enabling rapid electrical removal when needed, reducing the need for additional specialized components.
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 compound achieves easy, residue-free removal with high adhesive strength and improved shear strength, facilitating efficient rework and repair processes without negatively affecting substrate adhesion.
Implementation Method 1
the adhesive compound contains at least one electrolyte... can be electrically detached by applying a voltage
Implementation Method 2
Thanks to the electrolyte it contains, the adhesive can be electrically removed even after bonding by applying a voltage
Data Source
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AI summary
The invention relates to an adhesive compound, an adhesive tape, a bonded assembly, a method for electrically releasing the bonded assembly, and the use of the adhesive compound for bonding components in electronic devices, automobiles, medical devices, and dental devices. The adhesive compound comprises at least one electrolyte and a base compound, wherein the base compound has at least one first phase (i) containing at least one poly(meth)acrylate and at least one second phase (ii) containing at least one vinyl aromatic block copolymer, in particular a styrene block copolymer, wherein the adhesive compound contains at least 2.5 parts by weight of electrolyte per 100 parts by weight of the base compound.