Stretch releasable adhesive tape
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Solution Overview
Problem
Existing self-adhesive strips for consumer electronics face challenges in achieving high shock resistance and easy removal without residue, especially when used in thin, compact devices where detachment by stretching in the bonding direction is not possible and tears occur frequently, leading to incomplete removal.
Innovation Solution
A pressure-sensitive adhesive strip composed of foamed microballoon-containing adhesive layers and stretchable carrier layers based on polyvinylaromatic-polydiene block copolymers, with specific resin and additive compositions to ensure high shock resistance and easy removal by stretching, even at unfavorable angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the adhesive strip is made thinner for compact devices, then the device thickness is reduced, but tear resistance decreases and tears occur more frequently
Solution Approach 1:
The adhesive strip uses a composite structure combining a thin carrier layer (5-20 μm) with adhesive layers containing elastomeric blocks (40-70 wt%) that provide tear resistance. The carrier layer itself is made from block copolymers with elastomeric components, creating a composite material that maintains strength despite reduced thickness.
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive and carrier layers by incorporating specific block copolymers with elastomeric blocks containing vinyl groups. This chemical parameter change enables the thin structure to achieve sufficient mechanical strength and tear resistance through molecular-level material design.
2Length of moving object
If the adhesive strip is made thinner, then space is saved, but shock resistance decreases making removal difficult
Solution Approach 1:
The adhesive system uses composite material design where the carrier layer and adhesive layers both contain block copolymers with elastomeric blocks. This composite structure absorbs shock energy through the elastic deformation of the elastomeric components, maintaining shock resistance despite the reduced overall thickness of the adhesive strip.
Solution Approach 2:
The patent changes the viscoelastic parameters of the adhesive and carrier materials by incorporating block copolymers with specific elastomeric block compositions. These parameter changes enable the thin adhesive strip to dissipate shock energy effectively, maintaining reliability and enabling removal even after shock events.
3Ease of operation
If detachment is attempted at larger angles in compact devices, then removal is possible without stretching in bonding direction, but the adhesive strip tears more frequently
Solution Approach 1:
The patent modifies the mechanical parameters of the adhesive and carrier layers by incorporating elastomeric blocks with specific molecular structures. This enables the material to accommodate detachment at larger angles through elastic deformation, preventing tears while maintaining ease of operation in compact device configurations.
4Object-generated harmful factors
If stretching is used for removal, then the adhesive can be removed without residue, but the process requires sufficient space and is not feasible in compact devices
Solution Approach 1:
Instead of requiring stretching in the bonding plane for removal, the patent inverts the removal mechanism by designing the adhesive to release through elastic retraction when detached at larger angles. The elastomeric blocks enable the adhesive to peel away cleanly without residue, eliminating the need for stretching and making removal feasible in compact devices with limited space.
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 provides a self-adhesive strip with high shock resistance and strong bonding capabilities while allowing for easy removal without residue, suitable for thin, compact devices, ensuring effective detachment and minimal substrate damage.
Implementation Method 1
a pressure-sensitive adhesive strip (100, 200) consisting in particular exclusively of said PSA layers (2, 3) and carrier layers (1), with the at least one outer upper and one outer lower surface (102, 103) of the pressure-sensitive adhesive strip (100, 200) being formed by the PSA layer(s) (2, 3), wherein the PSA (2, 3) contains an elastomer part (a1, b1) and an adhesive resin part (a2, b2), wherein the carrier (1) consists of an elastomer part (b1) and an adhesive resin part (b2)
Implementation Method 2
at least one carrier (1) and wherein the PSA (2, 3) contains an elastomer part (a1, b1) and an adhesive resin part (a2, b2), wherein the carrier (1) consists of an elastomer part (b1) and an adhesive resin part (b2)
Data Source
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AI summary
The invention relates to a pressure-sensitive adhesive strip which can be detached again without leaving any residue or damage by stretching it essentially in the plane of the bond 5 , containing at least one layer of adhesive which is foamed with microballoons, and at least one backing B, with both the layer of adhesive and the Carrier B contain polyvinylaromatic-polydiene block copolymers with certain properties. The pressure-sensitive adhesive strips are used for bonding components such as, in particular, rechargeable batteries and electronic devices, such as in particular mobile phones.