| 摘要 |
Aqueous stable dispersions of a mixture of sparingly soluble UV absorbers, which comprises (a) 5 to 50% by weight of a mixture of a benzotriazole of formula <IMAGE> (1) and a 2-hydroxybenzophenone of formula <IMAGE> (2) wherein R is halogen, C1-C12alkyl, lower alkoxy, lower alkoxycarbonyl, cycloalkyl, aryl, C1-C12alkylaryl or aralkyl, and the rings A and B, each independently of the other, may be further substituted by halogen, hydroxy, lower alkyl, lower alkoxy or lower alkoxycarbonyl, R1 is hydrogen, hydroxy, C1-C14alkoxy or phenoxy, R2 is hydrogen, halogen or lower alkyl, R3 is hydrogen, hydroxy or lower alkoxy, and R4 is hydrogen or hydroxy, (b) 2 to 18% by weight of an anionic compound, and (c) 0 to 10% by weight of a nonionic compound. These dispersions of a mixture of UV absorbers are excellent compositions for enhancing the lightfastness of dyeings on synthetic fibers and, in particular, on polyester fibers or acid-modified fibers.
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