| 摘要 |
A fluorescent whitening agent comprising a mixture of compounds of the formulae Ia, Ib and Ic: in which the -SO3R groups are in the meta and/or para position, and wherein R and M, independently of each other are H, Na, Li, K, Ca, Mg, ammonium, or ammonium that is mono-, di-, tri- or tetra-substituted by C1-C4alkyl, C1-C4-hydroxyalkyl or a mixture thereof, a process for its preparation and its use to brighten paper and especially textile materials.
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