Electrically Peelable Adhesive Composition for Rapid Voltage-Triggered Debonding
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Solution Overview
Problem
Existing electrically peelable pressure sensitive adhesive sheets require a long time to peel from adherends and are costly due to the use of specialized ionic liquids, with limited adhesion decrease upon voltage application.
Innovation Solution
An electrically peelable pressure sensitive adhesive composition comprising an acrylic copolymer with specific structural units and a surfactant, which provides high adhesiveness before voltage application and significant adhesion decrease upon voltage application, facilitating quick peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If electrochemically debondable adhesive comprising high load-resistant bonding polymer and electrolyte is used, then adhesion strength is improved, but peeling time increases to 10-15 minutes resulting in poor workability
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using acrylic polymer with specific functional groups (carboxyl, hydroxyl, or amino groups) instead of high load-resistant bonding polymer, and by controlling the water content to 1-50 mass% and electrolyte content to 1-30 mass%, achieving both strong adhesion and rapid peeling within 1 minute
Solution Approach 2:
The patent creates a composite adhesive system combining acrylic polymer with specific functional groups, electrolyte, and water in controlled proportions, which enables both strong initial adhesion and rapid peeling response when voltage is applied, resolving the contradiction between adhesion strength and peeling speed
2Ease of operation
If ionic liquid is used as pressure sensitive adhesive, then peelability during voltage application is improved, but cost increases due to special structure and high price
Solution Approach 1:
The patent replaces expensive ionic liquid with a cost-effective formulation using common acrylic polymer, electrolyte, and water that achieves the same electrical peeling effect, making the adhesive economically viable for practical applications
Solution Approach 2:
The patent changes the material composition from specialized ionic liquid to a parametric formulation of acrylic polymer with specific functional groups, electrolyte, and controlled water content, achieving comparable peelability at lower cost
3Ease of manufacture
If conventional pressure sensitive adhesive is used, then manufacturing cost is reduced, but adhesion decrease rate upon voltage application is insufficient
Solution Approach 1:
The patent optimizes the parametric composition including water content (1-50 mass%), electrolyte content (1-30 mass%), and specific functional group content in acrylic polymer to achieve both cost-effectiveness and reliable adhesion decrease rate of 30% or more upon voltage application
Solution Approach 2:
The patent creates a simplified version of ionic liquid functionality using common materials (acrylic polymer, electrolyte, water) that replicates the electrical peeling effect without requiring expensive specialized compounds
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 composition ensures good adhesion and excellent peelability due to voltage application, reducing peeling time and costs associated with specialized materials.
Implementation Method 1
an electrically peelable pressure sensitive adhesive composition comprising an acrylic copolymer (A) and a surfactant (B)
Implementation Method 2
electrically peelable pressure sensitive adhesives whose adhesion decreases by applying a voltage
Data Source
AI summary
An electrically peelable pressure sensitive adhesive sheet has a pressure sensitive adhesive layer formed of an electrically peelable pressure sensitive adhesive composition comprising an acrylic copolymer (A) comprising 1 to 99 mass % of a constituent unit (a1) derived from a compound represented by the following general formula (a1), and a surfactant (B). The electrically peelable pressure sensitive adhesive sheet has high adhesion before voltage application, but the adhesion can be effectively decreased by voltage application for a short time.wherein R1 represents a hydrogen atom or a methyl group, R2 represents an alkylene group having 1 to 5 carbon atoms that is unsubstituted or has a substituent, and R3 represents an alkyl group having 1 to 8 carbon atoms that is unsubstituted or has a substituent; and a value of n is an integer of 1 or more.