Process for electroplating nonconductive surface

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating selected area

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205159, 205162, 205163, 205164, 205165, 205166, 205183, 205188, C25D 502, C25D 554, C25D 556, C23C 2800

Patent

active

055475582

ABSTRACT:
The invention relates to a process for directly electroplating a conductive metal to the inner walls of through-holes in printed-wiring boards. The process comprises steps of providing an aqueous dispersion containing graphite particles with an average particle diameter of 2 .mu.m or less or carbon black particles with an average particle diameter of 1 .mu.m or less; applying this aqueous dispersion to a surface of a nonconductive surface substrate; dipping the nonconductive surface in a strong acidic aqueous solution with pH 3 or lower to form a layer of said particles; and electroplating using the particle layer as a conductive layer.

REFERENCES:
patent: 4035265 (1977-07-01), Saunders
patent: 5015339 (1991-05-01), Pendleton
patent: 5389270 (1995-02-01), Thorn et al.

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