Methods of generating manganese (III) ions in mixed aqueous acid solutions using ozone

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United States of America Patent

PATENT NO 10889905
APP PUB NO 20200181787A1
SERIAL NO

16593397

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Manganese-(III) species is generated and regenerated in a mixed aqueous acid solution containing manganese-(II) species by injecting ozone gas in the mixed aqueous acid solution such that ozone oxidizes at least some of the manganese-(II) species to the manganese-(III) species with at least 60% Mn(III) generation efficiency. The acids include sulfuric acid and an alkane sulfonic acid. The aqueous acid solution containing manganese-(III) and manganese-(II) species is used to etch polymer materials. The etch is a chrome-free etch method.

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Patent OwnerAddress
DUPONT ELECTRONIC MATERIALS INTERNATIONAL LLC455 FOREST STREET MARLBOROUGH MA 01752

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Balantrapu, Krishna Cambridge, US 22 113
Scheybal, Andreas Zurich, CH 4 15
Weitershaus, Katharina Kriens, CH 5 19

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