Method for removing coatings from metal substrates prone to corr

Details Method for removing coatings from metal substrates prone to corr Method for removing coatings from metal substrates prone to corr

1992-07-24

1994-03-01

Springer, David B.

Cleaning and liquid contact with solids

Processes

Paints, varnishes, lacquers, or enamels, removal

548543, C09D 900

Patent

active

052903656

ABSTRACT:
The invention relates to a method for removing coatings, in particular, organic coatings from metal substrates which are easily corroded or discoloured: aluminimum, aluminium alloy, zinc or zinc alloy.
Previously known compositions for this purpose were based on methylene chloride which is environmentally undesirable. In contrast, this invention uses a composition which comprises strong alkali, a polyhydric alcohol or ether derivative thereof and a pyrollidone and/or a lactone. The preferred pyrollidone is N-methyl pyrollidone.

REFERENCES:
patent: 3673099 (1972-06-01), Corby et al.
patent: 4276186 (1981-06-01), Bakos et al.
patent: 4737195 (1988-04-01), Carandang et al.
patent: 4744834 (1988-05-01), Haq
patent: 4933091 (1990-06-01), Geke et al.

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