Foam Adhesive Skin Patch for Long-Wear Comfort and Adhesion
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Solution Overview
Problem
Adhesive skin patches often cause skin irritation, peeling, discomfort, and pain due to differences in stretchability between the patch and the skin, especially when worn over extended periods.
Innovation Solution
An adhesive skin patch with a foam substrate having high elongation and low breaking strength, combined with an adhesive layer containing an acrylic copolymer and a liquid or pasty component, provides cushioning and flexibility, reducing skin irritation and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesive skin patch is used, then adhesion to skin is achieved, but skin irritation and inflammation occur
Solution Approach 1:
The patent changes the physical parameters of the adhesive layer by incorporating a foam structure with controlled cell size and density. The foam layer's elasticity modulus and compressibility are adjusted to match skin mechanics, transforming the adhesive from a rigid to a compliant material that adheres without causing irritation.
Solution Approach 2:
The patent creates a composite adhesive structure combining a foam core layer with adhesive surface layers. This composite design integrates the cushioning properties of foam with the bonding properties of adhesive materials, achieving both secure attachment and skin comfort.
2Strength
If a wearable device harder than the adhesive skin patch is mounted on skin, then device structural integrity is maintained, but impression and pain occur on the skin
Solution Approach 1:
The patent incorporates a foam cushioning layer between the rigid wearable device and the skin surface. This layer is designed with specific compression characteristics to absorb and distribute pressure before it reaches the skin, preventing pain and discomfort while maintaining device integrity.
Solution Approach 2:
The patent uses a flexible foam layer as an intermediary between the rigid device and skin. This flexible layer conforms to skin contours and device geometry, providing mechanical compliance that prevents pressure points and discomfort.
3Stability of the object's composition
If the adhesive skin patch is made rigid to maintain structure, then device mounting stability is improved, but the patch cannot follow skin expansion and contraction, causing peeling and discomfort
Solution Approach 1:
The patent transforms the adhesive layer into a foam structure with controlled cell geometry and material composition. This creates a material with optimized elastic properties that can stretch and compress with skin movements while maintaining overall patch integrity and adhesive function.
Solution Approach 2:
The patent creates a composite structure where the foam core provides mechanical compliance and stretchability, while the adhesive surface layers maintain bonding strength. This composite design allows the patch to follow skin dynamics without compromising adhesion durability.
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 skin patch effectively minimizes skin irritation, peeling, and discomfort by conforming to the skin's expansion and contraction, maintaining adhesion over time.
Implementation Method 1
the substrate is formed of a foam sheet having breaking elongation of 100% or more, breaking strength of 10 N/20 mm or less, a density in the range of from 0.15 to 0.4 g/cm3
Implementation Method 2
an adhesive layer is provided on one surface of the substrate
Data Source
Figure 1~3
AI summary
The present invention relates to an adhesive skin patch including a substrate and an adhesive layer, wherein the substrate is formed of a foam sheet having breaking elongation of 100% or more, breaking strength of 20 N/20 mm or less, a density of 0.5 g/cm3 or less and a thickness of 0.300 mm or more, the adhesive layer is formed on one side of the substrate, and the adhesive layer contains an acrylic copolymer and a liquid or pasty component at room temperature.