COMPOUND, PROCESS FOR SEALING ANODICALLY OXIDED ALUMINUM OR ALUMINUM ALLOY SURFACE AND PROCESS FOR COMPOUND PRODUCTION

摘要

Anodically oxidized aluminium or aluminium alloy surfaces are sealed in the presence of an anti-smut agent which is a colorless, light-fast, organic compound having a molecular weight of at least 350 and containing (i) at least one sulphonic acid group; and (ii) a carboxy group and a hydroxy group both aromatically bound and located ortho- to each other on the same aromatic ring, preferably a benzene ring.