| 摘要 |
A whitening pigment 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 each of the two R1 groups, independent of the other, represents a C1-C6alkyl or C1-C4alkyl-O-C1-C4alkyl residue, which is substituted by one or two -CONH2, -CONHC1-C 4alkyl, -COOH, -SO2NH2, -SO2NHC1- C4alkyl or -NH2 groups, each of the two R2 groups, independent of the other, represents hydrogen, C1-C 4alkyl, C2-C4hydroxyalkyl or C1-C 4alkoxyC1-C4alkyl, or R1 and R2 together with the nitrogen atom complete a piperazine ring, each of the two X1 groups, independently, represent -OH, - OC1-C4alkyl, -Oaryl or the group -NR3R 4, wherein R3 and R4 each, independently, represent hydrogen, C1-C4alkyl, C2-C4hydroxyalky, C1-C4alkoxyC 1-C4alkyl, a phenyl, phenyl mono- or disulphonic acid residue or, R3 and R4, together with the nitrogen atom to which they are attached, complete a morpholino, piperidino or pyrrolidino ring or, alternatively, X1 represents an amino acid residue from which a hydrogen atom has been abstracted from the amino group and M is hydrogen, an alkaline or alkaline earth metal ion, ammonium, mono- di-, tri- or tetra-substituted C1-C4 alkylammonium or C2-C4hydroxyalkylammonium or mixtures thereof, a process for preparation of the pigments and the use thereof for the fluorescent whitening of paper.
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