The present invention relates to a fluorescent whitening agent comprising a mixture of two symmetrically and one asymmetrically substituted triazinylaminostilbene disulphonic acids, novel asymmetrically substituted derivatives, a process for their preparations and use of the mixture for whitening synthetic or natural organic materials, especially paper and for the fluorescent whitening and improvement of sun protection factors of textile materials.
                            本发明涉及一种
荧光增白剂,包括两种对称取代和一种不对称取代的三嗪基
氨基苯基
亚甲基二磺酸的混合物,新颖的不对称取代衍
生物,其制备方法以及将该混合物用于增白合成或天然有机材料,特别是纸张的荧光增白和改善纺织材料的防晒因子的用途。