| 摘要 |
<p>Dibenzthiophene dioxides, useful as optical brighteners for plastics and fibre-forming synthetic materials such as polyesters, polyamides, polyurethanes, polyolefins polyvinyl acetate, PVC, polyvinylidene, chloride polyacrylonitrile and modified polyacrylonitrile, cellulose tri-acetate, cellulose-hemipenta-acetate and polystyrene, have the formula (where R1 and R2 are H, halogen, carboxy, carbalkoxy, alkenyl, alkyl or aryl, opt. substd. m and n are nos. 1-3, the rings A1 and/or A2 may carry non-water-solubilising substituents, and when m and/or n are more than 1, each of R1 and R2 may be as above).</p> |
