US 12,460,301 B2
Catalyst solution for electroless plating devoid of an amine
Katharine Anne Bartlett, St. Charles, MO (US); Scott R. Johnston, St. Louis, MO (US); Zachlyn Nell Farwig, Fenton, MO (US); and Joseph A. Norris, Jr., St. Louis, MO (US)
Assigned to The Boeing Company, Chicago, IL (US)
Filed by The Boeing Company, Chicago, IL (US)
Filed on Mar. 15, 2022, as Appl. No. 17/654,923.
Prior Publication US 2023/0295808 A1, Sep. 21, 2023
Int. Cl. C23C 18/52 (2006.01); B01J 31/02 (2006.01); B01J 31/22 (2006.01); C23C 18/16 (2006.01)
CPC C23C 18/52 (2013.01) [B01J 31/0201 (2013.01); B01J 31/0204 (2013.01); B01J 31/0208 (2013.01); B01J 31/2226 (2013.01); C23C 18/1608 (2013.01); B01J 2531/824 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method of directly writing a desired pattern of metal on a surface of a substrate, the method comprising:
selectively applying a printable catalyst solution devoid of an amine to a surface of a substrate in the desired pattern, the catalyst solution comprising a catalytic metal salt, a solvent, and an epoxy;
drying the catalyst solution in the desired pattern on the surface of the substrate; and
electroless plating the substrate in a metal aqueous solution,
wherein the solvent comprises at least one of tetrahydrofuran, and toluene, and
wherein the catalytic metal salt comprises one of a chloride, a sulfate, and a nitrate.