Coating processes – With pretreatment of the base – Etching – swelling – or dissolving out part of the base
Patent
1974-09-23
1976-09-28
Mack, John H.
Coating processes
With pretreatment of the base
Etching, swelling, or dissolving out part of the base
204 20, 204 30, 204 38B, 427304, B05D 310, C25D 556
Patent
active
039832678
ABSTRACT:
The conventional electroless plating process for polymers involving (1) acid etching (2) activation by a mixture of tin salts and precious metal salts applied jointly or consecutively and (3) electroless deposition on to the activated surface, is improved by an intermediate treatment with a reducing acid solution between stages (1) and (2). Phosphorous, hypophosphorous, ortho-, hypo- and pyrophosphoric acids, preferably in amounts from 25-500 g./l. and optionally with their alkali metal and/or ammonium salts in amounts up to 500 g./l. as buffers can be used for immersions of up to 20 minutes at temperatures up to 70.degree.C. Poly phenylene oxides, ABS polymers, and polyolefins can be treated.
REFERENCES:
patent: 3592680 (1971-07-01), Bayer
patent: 3620804 (1971-11-01), Bauer et al.
patent: 3686017 (1972-08-01), Menikheim et al.
patent: 3702285 (1972-11-01), Knorre et al.
patent: 3704156 (1972-11-01), Foley, Jr. et al.
patent: 3758332 (1973-09-01), Dinella et al
patent: 3790400 (1974-02-01), Kuzmik
W. Latimer, "Oxidation Potentials," Prentice-Hall, N.Y. (1952), p. 109.
Mack John H.
W. Canning & Company Limited
Weisstuch Aaron
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