Pressure-Sensitive Adhesive Microcapsule with Radiation-Curable Gluing Agent
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Solution Overview
Problem
Existing pressure-sensitive adhesive microcapsules face issues with insufficient adhesiveness, uncontrollable gluing force, and transparency problems, particularly when using isocyanate compounds or gelatin as wall materials, and they often require releasing papers or films for installation, increasing costs.
Innovation Solution
A pressure-sensitive adhesive microcapsule is developed with a radiation-curable gluing agent encapsulated in a water-dispersible isocyanate wall film, including acrylate or methacrylate oligomers, a softening component, and a polymerization initiator, which remains non-adhesive until pressure is applied, allowing for controlled adhesion without the need for releasing papers or films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If isocyanate compound or gelatin is used as wall material, then microcapsule structure is formed, but adhesiveness is insufficient and wall material strength is inadequate
Solution Approach 1:
The patent uses a composite wall film structure consisting of gelatin as the base material and chitosan coating layer as the functional enhancement. The gelatin provides structural integrity and biocompatibility, while the chitosan layer contributes adhesive properties and mechanical strength. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both sufficient wall strength and adhesiveness.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the wall materials through controlled crosslinking reactions. By adjusting crosslinking density, molecular weight, and composition ratios of gelatin and chitosan, the patent optimizes both the structural strength and adhesive characteristics of the wall film, transforming the material properties to simultaneously satisfy both requirements.
2Strength
If pressure-sensitive adhesive microcapsules are used, then adhesiveness is provided, but releasing paper or film is required for installation, increasing complexity
Solution Approach 1:
The patent extracts and eliminates the releasing paper or film component from the traditional pressure-sensitive adhesive system. By designing microcapsules with controlled rupture characteristics and surface properties, the adhesive function is integrated directly into the microcapsule structure itself, removing the need for separate releasing layers and simplifying the overall system.
Solution Approach 2:
The microcapsules are designed to provide their own release functionality through controlled surface characteristics and rupture mechanisms. The capsule wall materials and surface treatments enable the adhesive to activate only when needed (upon capsule rupture), eliminating the need for external releasing agents or additional components to control adhesive activation.
3Strength
If adhesive is activated before pressure application, then strong adhesion is achieved, but control over gluing force is lost
Solution Approach 1:
The patent creates a dynamic adhesive system where the adhesive properties are not fixed but change in response to applied pressure. The microcapsule structure remains intact during handling and storage, providing no adhesion, but ruptures under controlled pressure conditions to activate the adhesive. This dynamic behavior allows full control over gluing force timing and magnitude.
Solution Approach 2:
The patent prepares the adhesive in a dormant, non-adhesive state within the microcapsule structure before pressure application. The adhesive agent is pre-positioned inside the capsules but kept inactive until the moment of need, when pressure causes capsule rupture and triggers adhesive activation. This preliminary preparation maintains control while ensuring strong adhesion when required.
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 microcapsule with adjustable adhesiveness that can be activated by pressure, eliminating the need for releasing materials and ensuring strong adhesion while maintaining transparency, suitable for various applications including signage and stationery.
Implementation Method 1
a radiation-curable gluing agent is encapsulated by a wall film
Data Source
AI summary
In a pressure-sensitive adhesive microcapsule, a radiation-curable gluing agent is encapsulated by a wall film, and the average particle diameter is smaller than 500 μm. A pressure-sensitive adhesive microcapsule-containing liquid includes the pressure-sensitive adhesive microcapsule and a binder. A gluing sheet includes a layer including the pressure-sensitive adhesive microcapsule on a support. A method for manufacturing the gluing sheet includes forming a layer including a pressure-sensitive adhesive microcapsule on a support by applying the pressure-sensitive adhesive microcapsule-containing liquid onto the support and then carrying out radiation irradiation. A method for manufacturing a laminate includes gluing the gluing sheet and an adherend by bringing a surface of the layer including the pressure-sensitive adhesive microcapsule in the gluing sheet and the adherend into contact with each other and compressing them together.