Polyurethane Skin Adhesive Composition With Balanced Device Bonding
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Solution Overview
Problem
Existing adhesive agents lack a good balance between adhesive force to the skin and adhesive force to a device, are not skin-friendly, and do not have improved antibacterial properties.
Innovation Solution
A polyurethane-based adhesive composition using a hydroxyl-terminated urethane prepolymer and a polyisocyanate compound, synthesized without a tin-based catalyst, with specific ethylene oxide content and catalyst composition to achieve balanced adhesion, skin-friendliness, and antibacterial properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an acrylic-based adhesive agent with organoiodine-based living radical polymerization initiator is used to improve antibacterial properties, then antibacterial properties are improved, but the adhesive force balance between skin and device deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive agent by using polyurethane-based adhesives with specific ethylene oxide content (5-50 mass%) and incorporating tin-free catalysts, thereby achieving both antibacterial properties and balanced adhesive force without relying on organoiodine-based initiators
Solution Approach 2:
The patent creates a composite adhesive system combining polyurethane-based adhesive with tin-free catalyst components, where the synergistic interaction between these materials provides both antibacterial activity and proper adhesive force balance to skin and device
2Strength
If adhesive force to device is increased, then adhesive force to device is improved, but skin friendliness deteriorates
Solution Approach 1:
The patent adjusts the ethylene oxide content parameter within 5-50 mass% range to optimize the adhesive properties, where this specific compositional parameter enables the adhesive to maintain strong bonding to device while remaining gentle and non-irritating to skin
3Ease of manufacture
If tin-based catalyst is used for polyurethane synthesis, then manufacturing process is simplified, but skin friendliness and safety deteriorate due to health concerns
Solution Approach 1:
The patent extracts and removes the tin-based catalyst from the polyurethane synthesis process, replacing it with tin-free catalysts that eliminate health concerns and skin irritation while maintaining the manufacturability and efficiency of the production process
Solution Approach 2:
The patent employs alternative tin-free catalysts that may be less expensive or easier to handle than tin-based catalysts, and the resulting adhesive formulation is designed to be disposed of safely without environmental or health concerns
4Strength
If adhesive force to skin is increased, then adhesive force to skin is improved, but ease of detachment and skin friendliness deteriorate
Solution Approach 1:
The patent optimizes the ethylene oxide content parameter (5-50 mass%) and molecular weight parameters of the polyurethane-based adhesive to achieve an optimal balance where the adhesive provides sufficient bonding strength to skin while maintaining ease of painless detachment
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 composition provides a good balance between skin and device adhesion, is gentle on the skin, and exhibits improved antibacterial properties.
Implementation Method 1
a hydroxyl-terminated urethane prepolymer and a polyisocyanate compound, in which the hydroxyl-terminated urethane prepolymer is a reaction product of an oxyalkylene polymer and a diisocyanate compound
Implementation Method 2
the hydroxyl-terminated urethane prepolymer is a reaction product of an oxyalkylene polymer and a diisocyanate compound in the presence of a tin-free catalyst
Data Source
AI summary
Provided are an adhesive composition that can provide an adhesive agent that has a good balance between the adhesive force to the skin and the adhesive force to a device, is skin friendly (capable of gently attaching and detaching an adherend to and from the skin, and low toxic), and has improved antibacterial properties, and the like. An adhesive composition comprising a hydroxyl-terminated urethane prepolymer and a polyisocyanate compound, in which the hydroxyl-terminated urethane prepolymer is a reaction product of an oxyalkylene polymer and a diisocyanate compound in the presence of a tin-free catalyst, the oxyalkylene polymer includes an oxyalkylene polymer A having the number of hydroxyl groups per molecule of 2 or more and an oxyalkylene polymer B having the number of hydroxyl groups per molecule of 1, and the hydroxyl-terminated urethane prepolymer has an average content of structural units based on ethylene oxide of 8 to 50% by mass.