Pressure-Sensitive Adhesive Article for Separator-Free Peeling
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Solution Overview
Problem
Existing adhesive sheets and tapes require separators, which are wasteful and difficult to remove, especially when using gloves or small sizes, and heat-sensitive adhesives have poor storage stability and require heating for adhesiveness, limiting their use.
Innovation Solution
An adhesive article with a gel content of 5-70% and a gel content change of -5% to 5% after 7 days at 40°C, allowing self-peeling without a separator and maintaining sufficient adhesive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator is used to protect the adhesive surface, then the adhesive surface is protected until application, but the separator is wasted and difficult to remove
Solution Approach 1:
The patent removes the separator from the adhesive sheet structure entirely. The adhesive layer is applied directly to the substrate without a protective separator, allowing the adhesive to be used immediately without discarding the separator, thus eliminating waste while maintaining adhesive surface protection through the substrate itself
Solution Approach 2:
The adhesive sheet is designed to be self-protecting through the substrate material itself, which provides the necessary protection and release characteristics without requiring an additional separator layer. The substrate serves both structural and protective functions
2Reliability
If a separator is used in adhesive sheets, then the adhesive surface is protected, but the separator cannot be efficiently peeled when wearing gloves or for small sizes
Solution Approach 1:
By removing the separator entirely from the adhesive sheet structure, the patent eliminates the peeling operation that causes difficulty when wearing gloves or working with small sizes. The adhesive can be applied directly without the need to peel a separator, improving ease of operation while maintaining protection through the substrate
3Strength
If heat-sensitive adhesive is used, then adhesiveness is achieved when heated, but storage stability is poor and heating is required for adhesion
Solution Approach 1:
The patent uses a pressure-sensitive adhesive formulation that maintains its adhesive properties across a wide temperature range without requiring heating. The adhesive composition is designed to remain stable during storage at ordinary temperatures and provides consistent adhesion when applied to adherends, eliminating the need for thermal activation while maintaining storage stability
4Strength
If heat-sensitive adhesive is used, then adhesiveness is achieved upon heating, but adherends with poor heat resistance cannot be applied to
Solution Approach 1:
The patent employs a pressure-sensitive adhesive that activates at room temperature through mechanical pressure rather than thermal energy. This allows the adhesive to bond to adherends with poor heat resistance without requiring heating, significantly expanding adaptability to a wider range of substrates while maintaining strong adhesive force
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 article can be easily unwound or separated without a separator, maintaining adhesive force, and does not require heating or special operations for adhesion, enhancing applicability and storage stability.
Implementation Method 1
applying an aqueous-dispersion type pressure-sensitive adhesive composition to a separator substrate and thermally crosslinking the composition to form an adhesive layer
Implementation Method 2
the adhesive layer has a gel content of 5-70%, the adhesive article, through 7-day storage at 40° C., has a change in the gel content of the adhesive layer of −5% to 5%
Data Source
AI summary
Provided is an adhesive article which requires no separator and exhibits sufficient adhesive force without the need of any operation for adhesive-force development and in which the adhesive layer, even when in contact with itself, can be peeled off at the interface. The adhesive article includes an adhesive body including an adhesive layer, wherein the adhesive layer has a gel content of 5-70%, the adhesive article, through 7-day storage at 40° C., has a change in the gel content of the adhesive layer of −5% to 5%, and surface portions of the adhesive layer are in contact with each other.