Product DescriptionPolymer synthesis technology to control coating layer morphology + Conductive filler dispersion control technology

Advances in IoT and 5G technology have been attracting widespread attention in recent years. In line with this trend, the Toyo Ink Group is working to accelerate the development of conductive pastes for use in stretchable electronic devices. The pastes conform to a variety of flexible and elastic substrates and are expected to further expand applications in the wearable and robotics fields.

Product Features

  1. Excellent durability and conductivity to withstand repeated stretching
  2. Capable of wiring formation on flexible substrates by screen printing
  3. Excellent moisture and heat resistance

Stretch test video

Product Details

Printing method Screen printing
Curing conditions 80 - 120°C / 30min
Volume resistivity 2.0×10-4(Ω・cm)
Durability for repeated stretching Maintains conductivity even when expanded and contracted 20% × 200,000 times

*The above values are representative and not guaranteed.

Specimen composition and test conditions

Elongation rate: 20%
Stretching speed: 10mm/s
Test environment: 23°C, 50%RH

No significant increase in resistance after 200,000 expansion/contraction cycles

Restore almost to initial resistance in a few minutes

Retention initial resistance even after storage at high temperature and high humidity

Applications

Stretchable wiring and electrodes
Sensors and actuators
Robotics for medical and nursing care, etc.

Technology OverviewPolymer synthesis technology to control coating layer morphology + conductive filler dispersion control technology

The Toyo Ink Group has developed conductive pastes for stretchable electronics with excellent characteristics to withstand repeated expansion and contraction, environmental resistance, and printability by applying our polymer synthesis technology to control the morphology of coating layers and our dispersion technology for conductive fillers.

Polymer synthesis technology to control the morphology of coating layers

・Morphology control

Our development teams can design and synthesize polymers for various properties with controlled primary structure (molecular arrangement, molecular weight, molecular weight distribution, etc.). This makes it possible to impart properties such as stretching durability, humidity and thermal resistance, and substrate adhesion.

We can design polymers according to various properties and synthesize polymers with controlled primary structure (molecular arrangement, molecular weight, molecular weight distribution, etc.). This allows us to impart properties such as elasticity durability, environmental resistance, and substrate adhesion.

Polymers with various primary structures can form the following self-assembled structures to control their physical characteristics.

・Relationship between morphology and mechanical properties

Elastic properties are achieved by controlling the primary structure of polymers and the morphology of coating layers.

[ Stress-Strain Curve ]

Conductive filler dispersion control technology

By controlling the dispersibility of the conductive filler through improvements in polymer-filler affinity, we have achieved a conductive paste with good conductivity capable of withstanding expansion and contraction (elastic deformation), and with excellent printability.

Conductive Pastes for Stretchable Electronics

  • Excellent stretchablity and recovery characteristics, moisture and heat resistance (20% x 200,000 cycles, 85°C/85%RH)
  • Wiring formation by screen printing

Toyo Ink SC Holdings Co., Ltd Inquiry for Conductive Pastes for Stretchable Electronics

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