| 摘要 |
<p>Hoe 77/K 068 (K 2587) DIAZOTYPE MATERIAL This invention relates to an improvement in a diazotype material comprising, in the light-sensitive layer, a diazo component and a coupling component which yields a black dyestuff image, the improvement that the diazo component is a 2,5-dialkoxy-4-morpho-lino-benzene diazonium salt and the coupling component is a combination of (a) 6-methoxy-2-hydroxy-3-naphthoic acid-N(.omega.-aminoalkyl)-amide as a blue coupler, (b) a 2-alkyl- or 2-aryl-1,3-dihydroxybenzene or a cyanoacetoamide as a yellow coupler, and (c) at least one compound of the general formula X wherein X is zero, =S, =SO, or =SO2, as a reddish-brown coupler, the molar ratio of blue coupler to yellow coupler being in the range of about (0.7 to 0.9) : 1, and the molar ratio of blue coupler to reddish-brown coupler being in the range of about (6 to 12) : 1.</p> |
