| 摘要 |
Polyurethane plastics are dyed with dyestuffs of the formula <IMAGE> wherein R1 denotes hydrogen, halogen, optionally substituted C1-C4-alkyl, optionally substituted C1-C4-alkoxy and optionally substituted C1-C4-alkylcarbonylamino and R2 denotes hydrogen, optinally substituted C1-C4-alkyl and optionally substituted C1-C4-alkoxy, while A and B denote optionally branched alkylene chains which can be identical or different and preferably have 2 to 6 carbon atoms, with formation of covalent bonds, in that the dyestuffs are added before or during the polyaddition reaction to the reacton mixture of polyol and polyisocyanate or to one of the components. |
