Importance

Loading Importance Indicators...

Abstract

The invention features and methods and compositions for oxide production on a Copper substrate, e.g., a Copper or Copper alloy substrate, to provide for improved adhesion of Copper substrate to polymeric material, e.g., such as used in manufacture of printed circuit boards. The oxide-producing compositions of the invention, which may be either acidic or ammoniacal, comprise 1) a source of Cu.sup.++ (Cupric) ions; 2) a source of a primary electrolyte that is non-interactive with Copper ions; 3) a Cuprous ligand, e.g., a halide ion, preferably chloride, which also serves as a secondary electrolyte; and 4) an optional organic. Acidic oxide-producing compositions comprise a strong acid as the primary electrolyte. The primary electrolyte of ammoniacal oxide-producing compositions is a non-interactive, ammonium salt of acid, which provides a highly soluble Cupric ammonium salt. The secondary electrolyte of the oxide-producing compositions is selected so as to be compatible with the primary electrolyte.

Loading the Abstract Image...

First Claim