Highly conductive, printable ink for highly stretchable soft electronics and highly conductive, ultra-stretchable conductors obtainable therefrom

A highly conductive, printable ink, comprising:

• (i) 1.5 to 21.0 vol % of conductive hydrophobic silver particles, with respect to the total volume of ink, as conductive solid phase,
• (ii) a liquid primary phase comprising, as a polymer base, a thermoplastic polyurethane (TPU) dissolved in an organic polar solvent, wherein the volume content of TPU in the organic polar solvent is in the range of 25% to 50%, wherein the liquid primary phase takes up 76.90 to 98.49 vol % with respect to the total volume of ink,
• (iii) a liquid secondary phase based on an ionic liquid, with a volume content in the range of 0.0015 to 2.1 vol %, with respect to the total volume of the ink, while the volume ratio ρ between said liquid secondary phase and said conductive solid phase falls in the range of 0.001 to 0.1, wherein the liquid secondary phase is immiscible with the liquid primary phase and does not wet the conductive solid phase, so that the three-phase system creates a capillary suspension.