US 12,139,628 B2
Electroconductive inkjet ink
Hiromichi Hayashi, Nagoya (JP); and Ayumi Murakami, Nagoya (JP)
Assigned to NORITAKE CO., LIMITED, (JP)
Appl. No. 17/435,450
Filed by NORITAKE CO., LIMITED, Nagoya (JP)
PCT Filed Feb. 19, 2020, PCT No. PCT/JP2020/006490
§ 371(c)(1), (2) Date Sep. 1, 2021,
PCT Pub. No. WO2020/184107, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019-044188 (JP), filed on Mar. 11, 2019.
Prior Publication US 2022/0056297 A1, Feb. 24, 2022
Int. Cl. C09D 11/52 (2014.01); C09D 11/033 (2014.01); C09D 11/037 (2014.01); C09D 11/106 (2014.01); C09D 11/322 (2014.01); C09D 11/36 (2014.01); H01B 1/22 (2006.01)
CPC C09D 11/52 (2013.01) [C09D 11/033 (2013.01); C09D 11/037 (2013.01); C09D 11/106 (2013.01); C09D 11/322 (2013.01); C09D 11/36 (2013.01); H01B 1/22 (2013.01)] 11 Claims
OG exemplary drawing
 
1. Electroconductive inkjet ink usable to produce an electronic component, the electroconductive inkjet ink comprising:
an inorganic powder containing metal particles having a melting point of 1200° C. or higher, a dispersant, an organic solvent, and a poly(vinyl acetal) resin, wherein:
the inorganic powder has an average primary particle diameter of 500 nm or less, a volume ratio of the inorganic powder is 7.5% by volume or lower with respect to 100% by volume as the total volume of the inkjet ink,
the ratio (SI/VD) of the specific surface area (SI) of the inorganic powder with respect to the volume (VD) of the dispersant where the total volume of the inkjet ink is 100% by volume is 0.25 or higher and 10 or lower,
the poly(vinyl acetal) resin has an average molecular weight of 2.5×104 or larger and 6.4×104 or smaller,
the ratio (WPA/WS) of the weight (WPA) of the poly(vinyl acetal) resin with respect to the weight (WS) of the organic solvent is 0.5% by weight or higher and 3% by weight or lower, and
the metal particles contain at least one element selected from the group consisting of tungsten (W), platinum (Pt), and molybdenum (Mo).