Stabilizers for improving the ozone fastness of dyes with oxadiazine-4-thione or triazine-4-thione compounds

A process for improving the color fastness of dyeings on synthetic or natural textile materials by treating the textile, before, during or after dyeing with at least one compound of the formula:

• ##STR10## wherein X is a divalent radical selected from:
• ##STR11## wherein R' and R are independently selected from the group of radicals comprising hydrogen, the radical --CH.sub.2 --CH.sub.2).sub.x OR", alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 3 to 8 carbon atoms, arylalkyl radicals of 7 to 9 carbon atoms, phenyl radicals and substituted phenyl radicals wherein up to 3 substituents can be present on the phenyl radical;
• wherein x is 0, 1, or 2 and wherein R" is hydrogen, methyl or ethyl radicals;
• so that 0.05 to 3% on weight of fiber of said compound remains on said fiber after dyeing.

A method of minimizing ozone fading in a dyed polyamide without reducing the light stability of the dyed polyamide comprising:

• treating a dyed polyamide with an ozone fade minimizing effective amount of a compound of the structural formula:
• ##STR13## wherein X is a divalent radical selected from:
• ##STR14## wherein R' and R are independently selected from the group of radicals comprising hydrogen, the radical --CH.sub.2 --CH.sub.2).sub.x OR", alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 3 to 8 carbon atoms, arylalkyl radicals of 7 to 9 carbon atoms, phenyl radicals and substituted phenyl radicals wherein up to 3 substituents can be present on the phenyl radical;
• wherein x is 0, 1, or 2 and wherein R" is hydrogen, methyl or ethyl radicals;
• so that 0.05 to 3% on weight of fiber of said compound is present on said fiber.