Process for the dyeing of thermoplastics in the melt
AssigneeCiba-Geigy Corporation
InventorJost von der Crone
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Abstract
Process for the dyeing of thermoplastics in the melt, which process comprises the use of dyestuffs of the formula ##STR1## wherein X.sub.1 - X.sub.4 represents H-atoms or halogen atoms, or one or two of the radicals X.sub.1 - X.sub.4 represent alkyl, alkoxy, phenyl or phenoxy groups, and those remaining represent H-atoms, R.sup.1 and R.sup.2 represent radicals of methylene-active compounds, or radicals of the formula .dbd.N--A wherein A stands for the radical of an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic amine or hydrazine, whereby, provided that R.sup.1 and R.sup.2 represent radicals of the formula .dbd.N--A, one A represents a heterocyclic radical containing N-atoms, optionally together with O- or S-atoms.
Claims9
Process for the dyeing of thermoplastics in the melt, which process comprises the use of dyestuffs of the formula ##STR18## wherein X.sub.1 - X.sub.4 represents H-atoms or halogen atoms, or one or two of the radicals X.sub.1 - X.sub.4 represent alkyl, alkoxy, phenyl or phenoxy groups, and those remaining represent H-atoms, R.sup.1 and R.sup.2 represent radicals of methylene-active compounds, or radicals of the formula .dbd.N--A wherein A stands for the radical of an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic amine or hydrazine, whereby, provided that R.sup.1 and R.sup.2 represent radicals of the formula .dbd.N--A, one A represents a heterocyclic radical containing N-atoms, optionally together with O- or S-atoms.
Dependencies are inferred from the claim text.