Composition and process for treating plastics with alkaline perm

Details Composition and process for treating plastics with alkaline perm Composition and process for treating plastics with alkaline perm

1984-06-07

1986-06-03

Smith, John D.

Compositions

Etching or brightening compositions

156668, 156642, 427307, 427 97, 252 795, C23C 1822, C23F 132

Patent

active

045928525

ABSTRACT:
An improved alkaline permanganate composition for etching printed circuit boards is provided by incorporating a secondary oxidant in the solution capable of oxidizing manganate ion to permanganate ion.

REFERENCES:
patent: 3425947 (1969-02-01), Rausch
patent: 3652351 (1972-03-01), Guisti
patent: 3833414 (1974-09-01), Grisik
patent: 4042729 (1977-08-01), Polichette
patent: 4073740 (1978-02-01), Polichette
patent: 4425380 (1984-01-01), Nuzzi
patent: 4474677 (1984-10-01), Foxlee
Nuzzi, "An Improved Permanganate Smear Removal Process", PC FAB., pp. 58, 60-63, Mar. 1984.

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