Patent ID: 8758634

Claim:
A composition for micro etching of a copper or a copper alloy surface comprising i) at least one source of Cu 2+ ions, ii) at least one source of halide ions wherein the halide ions are selected from fluoride, chloride and bromide, iii) at least one acid, iv) at least one salt of an organic acid, v) and at least one etch refiner according to formula I wherein R1 is hydrogen, C 1 -C 5 -alkyl or a substituted aryl or alkaryl group; R2 is in the 5 or 6 position and selected from the group consisting of hydrogen, C 1 -C 5 -alkyl and C 1 -C 5 -alkoxy; R3 and R4 are the same and are selected from the group consisting of hydrogen and C 1 -C 5 -alkyl; and X − is a suitable anion.