| 摘要 |
<p>Amino azoic dyes have high specific absorbance in extraction acid solution and are effective markers for oil distillation products : Markers of oil distillation products comprise amino azoic dyes of general formula (I) or their concentrated compositions having high dry titer in organic solvents containing 40-100 wt.% of the azodyes. [Image] R1>4-20C alkyl; R2>, R3>hydrogen, methyl, ethyl, OCH3 or OC2H5; R4>, R5>hydrogen, methyl or ethyl; X : hydrogen or OH; Y : hydrogen or a polyisocyanate chain of formula (II); and n : 1-4. [Image].</p> |
