| 摘要 |
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</SUB>, X<SUB>2</SUB>, X<SUB>3 </SUB>and X<SUB>4 </SUB>each, independent of the other, represent -NR<SUB>1 </SUB>R<SUB>2 </SUB>or -OR<SUB>3</SUB>, wherein R, and R<SUB>2 </SUB>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>4</SUB>alkoxy, hydroxy, carboxyl or a salt thereof (-CO2M), cyano, carbonamido, thiol, guanidine, substituted or unsubstituted phenyl, unsubstituted or C.-C<SUB>4</SUB>alkyl-substituted C<SUB>5</SUB>C8cycloalkyl, 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</SUB>, together with the nitrogen atom linking them, complete a 5- or 6-membered heterocyclic ring; R<SUB>3 </SUB>represents C,-C<SUB>4</SUB>represents H, Na, Li, K, Ca, Mg, ammonium, or ammonium that is mono-, di-, tri- or tetrasubstituted by C1-C4alkyl and/or C<SUB>2</SUB>-C<SUB>4</SUB>hydroxyalkyl 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. |
