Electrically Peelable Acrylic Adhesive with Polyol
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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 emulsion type acrylic polymer and a (poly)alkylene polyol with a number average molecular weight of 2000 or less, specifically 3.5 to 50 parts by mass, which effectively decreases adhesiveness when a voltage is applied.
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 replacing electrolyte-based ionic liquids with specific polyol compounds (polyethylene glycol, polypropylene glycol, or their copolymers) having controlled molecular weights (200-6000) and ratios. This parameter change enables adhesion decrease within 1 minute while maintaining strong initial adhesion, resolving the contradiction between adhesion strength and peeling time.
2Ease of operation
If ionic liquid is used as pressure sensitive adhesive, then electrical peelability is achieved, but cost increases and adhesion decrease rate is insufficient
Solution Approach 1:
The patent replaces expensive ionic liquids with cheaper polyol compounds that can be easily synthesized or obtained. The polyol-based adhesive provides comparable electrical peelability at lower cost, making the adhesive more economically viable for practical applications.
Solution Approach 2:
The patent optimizes the molecular weight and ratio parameters of polyol compounds to achieve sufficient adhesion decrease rate (30% or more) upon voltage application, overcoming the insufficient adhesion decrease observed with conventional ionic liquids.
3Ease of operation
If polyol content is increased to improve electrical peelability, then adhesion decrease rate improves, but initial adhesion strength may be compromised
Solution Approach 1:
The patent precisely controls the polyol content within 1-40 parts by mass per 100 parts of acrylic polymer active ingredient, and specifies polyol molecular weight of 200-6000. This parameter optimization ensures sufficient electrical peelability (adhesion decrease rate ≥30%) while maintaining strong initial adhesion, resolving the contradiction between peelability and adhesion strength.
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 solution achieves rapid adhesion decrease upon voltage application, improving workability and reducing costs by using a more affordable composition while maintaining high adhesion before voltage application.
Implementation Method 1
an electrically peelable pressure sensitive adhesive composition whose adhesiveness can be decreased by applying a voltage
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
An electrically peelable pressure sensitive adhesive composition consists of an emulsion type acrylic pressure sensitive adhesive (A) comprising an acrylic polymer (A1) obtained by emulsion polymerization in the presence of a surfactant using a monomer mixture comprising an alkyl (meth)acrylate, and a (poly)alkylene polyol (B) having a number average molecular weight of 2000 or less, wherein a content of the component (B) based on 100 parts by mass of active ingredient of the component(A) is 3.5 parts by mass or more. In the electrically peelable pressure sensitive adhesive composition, the adhesiveness before voltage application is high, but the adhesiveness can decrease effectively by voltage application for a short time.