Electrically Debondable Adhesive Tape With High Shear Strength

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Solution Overview

Problem

Existing adhesive technologies struggle to provide high initial adhesion strength and shear strength while allowing for easy and clean electrical detachment, particularly in applications like electronic device rework and repair, where current methods are time-consuming or leave residues.

Innovation Solution

An adhesive compound comprising a blend of poly(meth)acrylate and vinylaromatic block copolymer with an electrolyte, preferably ionic liquids, that can be electrically detached by applying a voltage, maintaining high adhesion strength before detachment and ensuring rapid, residue-free separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If heat-mediated separation methods are used to reduce adhesive cohesion, then manual separation can take place, but extensive rework is required to prepare the substrate surface contaminated with adhesive residues

Engineering Contradiction:

Improvemanual separationVSAvoidextensive rework

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent replaces thermal separation methods with electrical separation methods. By applying a voltage to the adhesive layer containing electrolyte, electrical forces cause the adhesive to detach from the substrate, eliminating the need for heat-mediated separation and subsequent cleaning rework.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the separation mechanism from thermal to electrical parameters. The adhesive layer is formulated with electrolytes that respond to electrical fields, allowing separation through voltage application rather than temperature increase, thus avoiding residue formation and reducing rework requirements.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If electrical separation methods are used to detach adhesive bonds, then detachment can be achieved, but initial strength of adhesion and shear strengths are reduced

Engineering Contradiction:

Improveelectrical detachmentVSAvoidinitial strength of adhesion

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent applies local quality by creating different functional zones within the adhesive layer. The adhesive formulation includes electrolytes that are activated only when voltage is applied, allowing the adhesive to maintain full bonding strength during normal use while enabling easy detachment when electrically stimulated.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamic behavior to the adhesive system. The adhesive transitions from a static strong-bonding state to a dynamic detachable state through voltage application. The electrolyte-containing adhesive layer can be activated or deactivated based on electrical stimuli, providing on-demand separation capability.

Inventive Principle:

Principle #15Dynamics

3Reliability

If adhesive compounds are designed for high shear strengths, then bonding reliability is improved, but electrical detachability and clean separation are compromised

Engineering Contradiction:

Improvebond strengthVSAvoidclean separation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent introduces electrolytes as intermediary substances within the adhesive layer. These electrolytes act as mediators that enable electrical interaction with the substrate, allowing the adhesive to maintain strong mechanical bonding properties while responding to electrical fields for clean separation without residue.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 high static and dynamic shear strengths with easy and clean electrical detachment, preserving adhesion integrity and avoiding residue formation during redetachment.

Implementation Method 1

the adhesive compound can be electrically detached by applying a voltage

Methodology Applied

Scientific EffectElectrical field effect: Electric Field

Implementation Method 2

with an electrolyte, preferably ionic liquids

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20260103625A1Adhesive compound, adhesive tape, bonded composite, and method for electrically debonding the bonded composite

Publication Date: 2026.04.16 TESA SE

AI summary

The disclosure relates to an adhesive compound, to an adhesive tape, to a bonded composite, to a method for electrically debonding the bonded composite, and to the use of the adhesive compound for the bonding of components in electronic devices, automobiles, medical devices, and dental devices. The adhesive compound includes at least one electrolyte and a base compound, wherein the base compound comprises at least one first phase (i) including at least one poly(meth)acrylate and at least one second phase (ii) including at least one vinylaromatic block copolymer, such as in particular styrene block copolymer, wherein the adhesive compound contains at least 2.5 parts by weight of electrolytes based on 100 parts by weight of the base compound.