Process for regeneration of cleaning compounds

Details Process for regeneration of cleaning compounds Process for regeneration of cleaning compounds

1993-01-13

1993-11-09

Powell, William A.

Compositions

Etching or brightening compositions

Inorganic acid containing

134 3, 134 10, 156626, 156642, 156666, C09K 1304, B44C 122, C23F 100

Patent

active

052599795

ABSTRACT:
This invention is a process to rejuvenate the depleted metal salt oxidizing agents used in microetch cleaning compositions and to maintain the desired etch rate. This process comprises the steps of: (1) measuring the reduced metal salt oxidizing agent in the microetch cleaning composition, (2) adding a rejuvenating agent in a stoichiometric or sub-stoichiometric quantity, and (3) mixing and allowing the rejuvenating agent to react with the reduced metal salt oxidizing agent to restore the concentration of the metal salt oxidizing agent to its approximate concentration in the original microetch cleaning composition.

REFERENCES:
patent: 3532568 (1970-10-01), Kovell et al.
patent: 3880685 (1975-04-01), Rehm et al.
patent: 3964956 (1976-06-01), Snyder
patent: 4233106 (1980-11-01), Goffredo
patent: 4747907 (1988-05-01), Acocella et al.
patent: 5188703 (1993-02-01), Greenberg

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