method for preparing a solution for the stroomloos precipitation of copper, method of stroomloos precipitation of copper, and thus provided a koperbekleding objects.

摘要

1,145,578. Printed circuits. PHOTOCIRCUITS CORP. 4 May, 1967 [6 May, 1966], No. 20684/67. Heading H1R. [Also in Division C7] Portions of an insulating substrate, such as a plastics material, of which many suitable examples are listed, are sensitized in the form of a desired printed circuit form, e.g. by treatment with an acidic aqueous solution of stannous chloride followed by a dilute acid aqueous solution of Pd chloride, or by treatment with a single acidic solution containing stannous chloride and a precious metal chloride such as Pd chloride. Cu or other metal is then deposited on one or more surfaces of the substrate, and on the walls of holes through it, by electroless deposition from a solution on to the sensitized parts of the substrate, said solution including a compound containing a cyanide radical complexed with a metal from Group VIII of the Periodic Table.