Bis(triazinylamino) stilbene compounds

Abstract

New stilbene derivatives of formula: ##SPC1## In which R.sub.1 signifies a hydrogen or halogen atom, or a lower alkyl group; R.sub.2 signifies a hydrogen atom; a cycloalkyl group which is unsubstituted or substituted by one or more lower alkyl groups; or a lower alkyl group which is unsubstituted or substituted by a hydroxyl, lower alkoxy or hydroxysubstituted lower alkoxy group or by a radical of formula (a); ##SPC2## M signifies a hydrogen atom or an equivalent of a colourless cation; n signifies 1 or 2; Alkylene signifies C.sub.1.sub.-8 alkylene; And the rings A and B are unsubstituted or substituted by one or more substituents selected from halogen atoms and lower alkyl, lower alkoxy, cyano and SO.sub.3 M groups; The compound containing at least six SO.sub.3 M groups per molecule, are useful as optical brighteners. They are produced by successive condensation of each of the three amino-containing moieties around the triazine nucleus, as an amine, with a cyanuro halide. Their application, particularly in certain liquid preparations, for the optical brightening of paper and textiles is described.

Dependencies are inferred from the claim text.