Detachable Primer Composition for Releasable Adhesive Bonds

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Solution Overview

Problem

Existing adhesive technologies fail to provide a releasable adhesive bond with sufficient strength that can be easily and cleanly separated upon activation, which is crucial for efficient recycling and disassembly of electronic devices.

Innovation Solution

A primer composition comprising acrylate-styrene copolymer and a chemical or physical blowing agent, which upon activation, allows for a strong adhesive bond to be easily released by expanding the blowing agent, reducing adhesive strength by at least 50%.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a strong adhesive bond is formed for permanent bonding, then bonding strength is improved, but the ability to separate and recycle components deteriorates

Engineering Contradiction:

Improveadhesive bond strengthVSAvoidseparability for recycling

Core Design Contradiction:

StrengthVSEase of repair

Solution Approach 1:

The primer composition is applied in advance to the substrate before the adhesive layer is applied. This preliminary action creates a specialized interface layer that predetermines the future separability of the bond, allowing strong initial bonding while maintaining easy release capability when needed for recycling

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The primer composition undergoes parameter changes through its specific formulation containing acrylate-styrene copolymer and blowing agent. When activated, the blowing agent causes volume expansion that reduces the adhesive strength, enabling the transition from strong bonding state to easily separable state for recycling purposes

Inventive Principle:

Principle #35Parameter changes

2Productivity

If adhesive bonding is used instead of mechanically detachable connections, then device compactness and manufacturing efficiency are improved, but disassembly and recycling difficulty increase

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoiddisassembly ease

Core Design Contradiction:

ProductivityVSEase of repair

Solution Approach 1:

The adhesive bond's parameters are made changeable through the primer composition's blowing agent. Upon activation, the blowing agent expands and alters the adhesive properties, enabling easy disassembly of bonds that were initially formed with high manufacturing efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The primer layer acts as an intermediary between the substrate and the adhesive layer. This intermediate layer provides the mechanism for controlled release, allowing the adhesive bond to serve both manufacturing efficiency and future disassembly needs

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 primer composition achieves a strong and durable adhesive bond that can be easily separated with minimal force, facilitating efficient recycling and disassembly of electronic devices.

Implementation Method 1

upon activation, allows for a strong adhesive bond to be easily released by expanding the blowing agent

Methodology Applied

Scientific EffectExpansion:

Data Source

PatentEP4685203A1Primer composition for forming a detachable adhesive bond

Publication Date: 2026.01.28 TESA SE

AI summary

Primer composition for the production of a releasable adhesive bond, comprising at least the following components: (a) at least one acrylate-styrene copolymer; and (b) at least one chemical or physical blowing agent.