Process for whitening polyester fibres by the exhaust method
AssigneeCiba-Geigy Corporation
InventorsWilly Schurings, Italo Anceschi, Gerhard Reinert
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Abstract
A process for whitening polyester fibres with a fluorescent whitening agent for polyester and a shading dye by the exhaust method, said process being carried out in a dispersion of the fluorescent whitening agent having a pH value above 9, preferably between 11 and 13.5.
Claims10
A process for whitening polyester fibres by the exhaust method by treating said fibres in an aqueous dispersion containing one or more fluorescent whitening agents for polyester which have affinity for the substrate and are stable under the application conditions, and a small amount of a blue or violet disperse dye, or a mixture thereof, as shading dye, which process comprises carrying out the treatment in said dispersion at a pH value above 9.
Dependencies are inferred from the claim text.