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Abstract

The invention relates to a composition for optical brightening of substrates suitable for ink jet printing, comprising a) a fluorescent whitening agent of the formula (1): wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 each, independent of the other, represent --NR.sub.1 R.sub.2 or --OR.sub.3, wherein R, and R.sub.2 are, independently of each other, hydrogen, cyano, a C,-C4alkyl group, which is unsubstituted or substituted by one or two of the following residues selected from the group consisting of C,-C.sub.4alkoxy, hydroxy, carboxyl or a salt thereof (--CO2M), cyano, carbonamido, thiol, guanidine, substituted or unsubstituted phenyl, unsubstituted or C.-C.sub.4alkyl-substituted C.sub.5C8cycloalkyl, halogen, a heterocycle and a sulphonic acid residue and wherein the carbon chain of an alkyl group having two, three or four carbon atoms can be interrupted by oxygen, or, alternatively, a C5-C7cycloalkyl group or R, and R.sub.2, together with the nitrogen atom linking them, complete a 5- or 6-membered heterocyclic ring; R.sub.3 represents C,-C.sub.4represents H, Na, Li, K, Ca, Mg, ammonium, or ammonium that is mono-, di-, tri- or tetrasubstituted by C1-C4alkyl and/or C.sub.2-C.sub.4hydroxyalkyl or mixtures of fluorescent whitening agents of formula (1); b) a catatonic polymer; c) water and, optionally least one pigment and/or at least one further auxiliary, methods of use of the composition and substrates that have been treated therewith.

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First Claim