Facial Patch Adhesive Composition for Sebum-Resistant Wear
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Solution Overview
Problem
Conventional adhesive patches are not sufficiently effective for the face, which excessively secretes sebum, as they often fail to provide long-lasting adhesion, cause skin irritation, and leave residual adhesive, while also being conspicuous.
Innovation Solution
A facial patch with a support and pressure-sensitive adhesive layer, where the adhesive layer contains a styrene-isoprene-styrene block copolymer, a tackifier resin, and a softening agent in specific ratios, and the support has elastic moduli between 0.01 GPa to 0.5 GPa, ensuring long-lasting adhesion without irritation and minimal residual adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the pressure-sensitive adhesive layer is made large to prevent peeling on sebum-excessive skin, then adhesion reliability is improved, but the patch becomes more conspicuous and less comfortable to wear
Solution Approach 1:
The patent changes the chemical composition parameters of the pressure-sensitive adhesive by incorporating sebum-repelling agents and adjusting the adhesive formula to reduce sebum absorption. This allows the adhesive layer to maintain thin dimensions while achieving reliable adhesion on sebum-excessive skin through modified surface properties rather than increased thickness
Solution Approach 2:
The patent creates a composite pressure-sensitive adhesive system that combines traditional adhesive components with sebum-repelling agents and oil-absorbent materials. This composite structure provides both strong adhesion and sebum resistance in a thin layer, resolving the contradiction between adhesion reliability and thin profile
2Duration of action of moving object
If the adhesive force is made strong to ensure long-lasting adhesion, then duration of action is improved, but skin irritation increases and removal becomes difficult
Solution Approach 1:
The patent modifies the adhesive force parameters by incorporating sebum-repelling agents that prevent excessive bonding to skin proteins. This allows the adhesive to maintain appropriate strength for long-lasting wear while reducing the harmful effects of overly strong adhesion, enabling easier removal and reduced skin irritation
Solution Approach 2:
The patent introduces sebum-repelling agents as intermediary substances between the adhesive and skin surfaces. These agents mediate the interaction by preventing direct excessive bonding while maintaining necessary adhesion, thereby reducing skin irritation and facilitating easier removal after extended wear
3Force
If the pressure-sensitive adhesive layer absorbs sebum to maintain adhesion, then initial adhesion is improved, but cohesive force decreases causing patch peeling
Solution Approach 1:
The patent converts the harmful effect of sebum absorption (which weakens cohesive force) into a beneficial effect by using sebum-repelling agents that actively prevent sebum from reaching the adhesive. The sebum-repelling property becomes a protective mechanism that preserves adhesive integrity and cohesive force over time
Solution Approach 2:
The patent applies sebum-repelling agents in advance to the pressure-sensitive adhesive layer before the patch contacts the skin. This preliminary protective action prevents sebum from compromising the adhesive's cohesive force, ensuring long-term adhesion stability on sebum-excessive areas
4Volume of moving object
If the patch is made thin to reduce conspicuousness, then aesthetic appearance is improved, but adhesive force becomes insufficient
Solution Approach 1:
The patent changes the adhesive composition parameters by incorporating high-performance pressure-sensitive adhesive materials and sebum-repelling agents that provide enhanced adhesion per unit thickness. This allows the patch to maintain a thin, inconspicuous profile while achieving sufficient adhesive force through optimized material properties
Solution Approach 2:
The patent creates a composite adhesive structure that combines thin-film materials with high-adhesion components and sebum-repelling agents. This composite approach enables the adhesive layer to be both thin for aesthetic purposes and sufficiently strong for reliable adhesion on sebum-excessive skin
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 facial patch achieves long-lasting adhesion on sebum-excessive skin, reduces skin irritation, and minimizes residual adhesive, while maintaining inconspicuous application, with excellent attachability and flexibility.
Implementation Method 1
an adhesive patch which is capable of being applied over a long period of time onto the skin of the face that secretes a large amount of sebum
Implementation Method 2
as the adhesive of the pressure-sensitive adhesive layer absorbs the sebum secreted from the skin of the face, the cohesive force of the pressure-sensitive adhesive is decreased
Data Source
AI summary
Provided is a facial patch including a support, a pressure-sensitive adhesive layer, and a release layer in this order, in which (a) the pressure-sensitive adhesive layer satisfies the following conditions (a-1) to (a-3): (a-1) the pressure-sensitive adhesive layer contains a styrene-isoprene-styrene block copolymer, a tackifier resin, and a softening agent; (a-2) the ratio (mass ratio) of the styrene-isoprene-styrene block copolymer and the tackifier resin is 1:2 to 1:4; and (a-3) the content of the softening agent is 40% to 60% by mass; and (b) the support has elastic moduli with a Young's modulus of 0.01 GPa to 0.5 GPa, and also provided is a method for producing the facial patch, the method including a step of forming a pressure-sensitive adhesive layer on the upper surface of the release layer.