Polyurethane Adhesive Tape Shock Resistance
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Solution Overview
Problem
Existing adhesive tapes lack high shock resistance and good redetachability while minimizing stretching, and often exhibit issues with residue left behind during removal.
Innovation Solution
An adhesive tape with a carrier thickness of 20 to 250 μm, made from uncrosslinked thermoplastic polyurethane produced by extrusion or dispersion, featuring pressure-sensitive adhesive layers on one or both sides, and optionally coated with a functional layer for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive tapes are made with conventional carriers, then they provide basic bonding functionality, but they lack high shock resistance and exhibit excessive stretching
Solution Approach 1:
The patent changes the material parameter of the carrier from conventional materials to polyurethane with specific properties (elongation at break ≥100%, resilience >50%). This parameter change enables the carrier to achieve high shock resistance while controlling stretching behavior, directly resolving the contradiction between strength and ease of operation.
Solution Approach 2:
The patent creates a composite structure combining the polyurethane carrier with pressure-sensitive adhesive layers. This composite material approach allows the carrier to provide shock resistance while the adhesive layers ensure proper bonding and redetachability, resolving the contradiction between strength and stretching control.
2Strength
If adhesive tapes are designed for strong bonding, then they achieve firm attachment to substrates, but they leave significant residues during removal
Solution Approach 1:
The patent changes the adhesive material parameters by selecting pressure-sensitive adhesives with specific compositions (vinylaromatic block copolymers with DACP >−20°C, or acrylic copolymers with specific glass transition temperatures). These parameter changes enable the adhesive to provide strong bonding while allowing clean redetachment without significant residues, resolving the contradiction between bonding strength and residue generation.
3Ease of operation
If adhesive tapes use conventional adhesive layers, then they provide basic adhesion, but they lack easy redetachability without residue or destruction
Solution Approach 1:
The patent changes the adhesive layer composition parameters by specifying vinylaromatic block copolymers with DACP >−20°C or acrylic copolymers with controlled glass transition temperatures. These parameter changes enable the adhesive to maintain reliable bonding performance while providing easy redetachability without residue or destruction, resolving the contradiction between ease of operation and reliability.
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 tape achieves high impact resistance, easy redetachability with minimal residue, and controlled stretching, making it suitable for bonding in electronic, optical, and precision mechanical devices.
Implementation Method 1
at least one layer (i) based on preferably uncrosslinked thermoplastic polyurethane that has been produced by means of extrusion
Implementation Method 2
a pressure-sensitive adhesive layer is disposed on at least one side, preferably both sides, of the carrier
Implementation Method 3
the carrier has been produced from crosslinked thermoplastic polyurethane... extensibility in longitudinal direction of between 850% and 2200%
Data Source
AI summary
The present invention relates to an adhesive tape comprising at least one carrier that has a thickness of 20 to 250 μm, preferably 50 to 150 μm, and has at least one layer (i) based on preferably uncrosslinked thermoplastic polyurethane that has been produced by means of extrusion, wherein the polyurethane is based on aromatic polyisocyanate, such as aromatic diisocyanate in particular, or (ii) based on preferably uncrosslinked polyurethane that has been produced from a dispersion, wherein a pressure-sensitive adhesive layer is disposed on at least one side, preferably both sides, of the carrier. The invention also relates to processes for producing the adhesive tape and to the use thereof for bonding of components in electrical, electronic, optical or precision mechanical devices, such as, in particular, of windows or lenses in housings of precision mechanical, optical and/or electronic devices.