Conductive Pressure-Sensitive Adhesive for Long-Term Skin Contact
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Solution Overview
Problem
Existing electrically conductive pressure-sensitive adhesives face challenges in providing long-term adhesion to both uneven, low-energy surfaces like skin and flat, high-energy surfaces like metals, while maintaining sufficient electrical conductivity and avoiding skin irritation and residue during removal.
Innovation Solution
A pressure-sensitive adhesive comprising a polymer network with specific proportions of plasticizer, ionic compound, and electrically conductive particles, optimized for biosignal measurements, improves adhesion and conductivity by enhancing skin contact and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proportion of electrically conductive particles is increased to reduce electrical resistance, then electrical conductivity is improved, but long-term adhesion to skin is reduced
Solution Approach 1:
The patent optimizes the proportion of electrically conductive particles within a specific range (5-30 wt.%) rather than maximizing it, finding that excessive particle content harms adhesion. This parameter optimization resolves the contradiction by identifying the optimal balance point where electrical conductivity is sufficient without compromising long-term adhesion to skin.
Solution Approach 2:
The patent creates a composite adhesive system combining polymer matrix, plasticizers, ionic compounds, and electrically conductive particles. This composite approach allows the different components to work synergistically, where the polymer and plasticizer maintain adhesion while the conductive particles provide necessary electrical conductivity without dominating the formulation.
2Reliability
If the proportion of ionic compounds is increased to improve skin contact, then skin impedance is reduced, but adhesion is reduced
Solution Approach 1:
The patent specifies an optimal range for ionic compound content (0.5-8 wt.%) that provides sufficient skin contact and impedance reduction without excessive addition. This parameter control prevents adhesion loss while achieving the desired electrical contact quality with skin.
Solution Approach 2:
The patent introduces plasticizers as intermediary substances that mediate between the adhesive polymer and skin surface. The plasticizer (1-15 wt.%) modifies the adhesive's properties to enhance skin wetting and contact without requiring excessive ionic compounds, thereby maintaining adhesion strength while improving skin contact quality.
3Reliability
If plasticizer is added to improve skin wetting, then adhesion to uneven surfaces is improved, but manufacturing cost increases
Solution Approach 1:
The patent defines a specific plasticizer content range (1-15 wt.%) that achieves adequate skin wetting and adhesion to uneven surfaces without excessive addition. This controlled parameter approach ensures sufficient performance while limiting cost increase from plasticizer procurement and processing.
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 achieves consistent and long-term adhesion with reduced skin impedance, ensuring effective biosignal measurement without skin irritation or residue, while minimizing additive quantities to maintain cost-effectiveness.
Implementation Method 1
the mobility of the polymer network is reflected in the glass transition temperature of the pressure-sensitive adhesive, which is reduced by the plasticizer... the wetting of the skin by the pressure-sensitive adhesive can be improved by adding plasticizers
Implementation Method 2
conduction through the skin is based on the movement of ions, not electrons
Data Source
Figure 1
AI summary
The invention is based on a pressure-sensitive adhesive, particularly for skin applications, with a polymer network comprising at least one copolymer. To improve the production of the pressure-sensitive adhesive and its use for biosignal measurements, it is proposed that the pressure-sensitive adhesive contain 1 to 15 wt.% of at least one plasticizer, 0.5 to 8 wt.% of at least one ionic compound, and 5 to 30 wt.% of at least one type of electrically conductive particles.