Crosslinked Polyurethane Adhesive Tape for Low-Force Detachment
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Solution Overview
Problem
Existing redetachable adhesive tapes require high forces for removal, which can damage sensitive electronic components, and there is a need for a balance between peel adhesion and redetachability to ensure non-destructive parting.
Innovation Solution
An adhesive tape featuring a crosslinked polyurethane carrier and a pressure-sensitive adhesive layer based on vinylaromatic block copolymer, designed to be releasable by stretching with low tensile strength and high elongation, minimizing residue and damage upon detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the adhesive tape uses conventional materials and structure, then sufficient peel adhesion is achieved, but high forces are required for removal which can damage sensitive electronic components
Solution Approach 1:
The patent changes the chemical composition parameters of the carrier layer by incorporating specific plasticizers (phthalate esters, cyclic carbonate esters, or glycol esters) in controlled amounts (0.1-10 wt%), which modifies the mechanical properties to enable low-force removal while maintaining adequate adhesion
Solution Approach 2:
The patent creates a composite carrier layer combining polyurethane with specific plasticizers and optionally silicone oil, achieving a material system that provides both sufficient bond strength and easy, damage-free removal when stretched
2Strength
If the adhesive tape is designed for strong bonding, then robust bond between components is achieved, but large forces must be applied to remove the tape
Solution Approach 1:
The patent introduces dynamic behavior through the stretchable carrier layer that can be elongated up to 500-1000%, allowing the adhesive to be applied strongly and then removed dynamically through stretching, transforming the removal mechanism from high-force pulling to low-force elastic deformation
Solution Approach 2:
The patent modifies the mechanical parameters of the carrier layer by adding plasticizers that enhance elasticity and stretchability while controlling the balance between bond strength and removal force through specific compositional ratios
3Strength
If the adhesive tape uses crosslinked polyurethane carrier, then structural integrity is improved, but stretchability is reduced and tearing occurs during detachment
Solution Approach 1:
The patent adjusts the crosslinking density and polyol molecular weight parameters in the polyurethane synthesis, creating an optimal balance where the network structure provides sufficient integrity but remains flexible enough to stretch 500-1000% without tearing
Solution Approach 2:
The patent combines crosslinked polyurethane with plasticizers and silicone oil to create a composite material system where the plasticizers act as internal lubricants and flexibility agents, preventing crystallization and maintaining elasticity even in crosslinked structures
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 low force detachment with minimal tearing and no residue, maintaining sufficient peel adhesion for robust bonding, making it suitable for electronic components.
Implementation Method 1
a crosslinked polyurethane carrier... designed to be releasable by stretching with low tensile strength and high elongation
Implementation Method 2
an adhesive layer based on vinylaromatic block copolymer... maintaining sufficient peel adhesion for robust bonding
Data Source
AI summary
The present invention relates to a redetachable adhesive tape having a carrier based on a crosslinked polyurethane and an adhesive layer based on vinylaromatic block copolymer, to a method for producing the adhesive tape and the use of the adhesive tape in the production of electronic components.