WHITENING PIGMENTS

摘要

The present invention relates to novel whitening pigments comprising the reaction product of (a) a melamine-formaldehyde and/or a melamine-urea polycondensation product and (b) a water-soluble fluorescent whitening agent of the formula (1) wherein R1 represents -OH, -OC1-C4alkyl, -Oaryl, -NH2, - NHC1-C4alkyl, -N(C1-C4alkyl)2, -NHC2-C4hydroxyalkyl, -N(C2-C4hydroxyalkyl)2, - N(Cl-C4alkyl)( C2-C4hydroxyalkyl), -NHC1-C4alkoxy-C1-C4alkyl, -N(C1-C4alkoxy - C1-C4alkyl)2, morpholino, piperidino, pyrrolidino or the residue of an amino acid from which a hydrogen atom has been abstracted from the amino group, R2 represents -CONH2, -CONHC1-C4alkyl, -COOM, -SO2NH2 or -SO2NHC1-C4alkyl and M is hydrogen, sodium, potassium, calcium, magnesium, ammonium, mono-di-, tri- or tetra-substituted C1-C4alkylammonium or C2-C4hydroxyalkylammonium or mixtures thereof, a process for preparation of the whitening pigments and their use for the fluorescent whitening of paper, especially in coating, for the fluorescent whitening and improvement of sun protection factors of texti le materials and for improving the aspect of solid detergent compositions. Further disclosed are certain novel fluorescent whitening agents suitable fo r preparation of the whitening pigments and a process for their preparation.