US 12,031,047 B2
Highly conductive, printable ink for highly stretchable soft electronics
Hongye Sun, Karlsruhe (DE); Norbert Willenbacher, Kirchheimbolanden (DE); and Zongyou Han, Karlsruhe (DE)
Assigned to KARLSRUHER INSTITUT FÜR TECHNOLOGIE, (DE)
Appl. No. 17/276,863
Filed by KARLSRUHER INSTITUT FÜR TECHNOLOGIE, Karlsruhe (DE)
PCT Filed Sep. 24, 2019, PCT No. PCT/EP2019/075692
§ 371(c)(1), (2) Date Mar. 17, 2021,
PCT Pub. No. WO2020/074251, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 18200100 (EP), filed on Oct. 12, 2018.
Prior Publication US 2022/0025201 A1, Jan. 27, 2022
Int. Cl. C09D 11/00 (2014.01); C09D 11/03 (2014.01); C09D 11/101 (2014.01); C09D 11/52 (2014.01); H01B 1/22 (2006.01)
CPC C09D 11/52 (2013.01) [C09D 11/03 (2013.01); C09D 11/101 (2013.01); H01B 1/22 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A highly conductive and printable ink, comprising:
(i) 5 to 40 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 cross-linkable hydrophobic polydimethylsiloxane (PDMS) which is capable to become an elastomer by cross-linking, and further including a cross-linker in an amount of 1 to 10 vol % and a catalyst solution in an amount of 0.01 to 5 vol %, with respect to the PDMS base, and
(iii) a liquid secondary phase based on an ionic liquid, with a volume ratio ρ of 0.01 to 0.2 between liquid secondary phase and conductive solid phase,
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.