Diazotype material

US4207110A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Siegfried Scheler · Wiesbaden, DE
• Heinz Schafer · Burghausen, DE

Key dates

• Filing date: Oct 13, 1978
• Grant date: Jun 10, 1980
• Expiry date: Oct 13, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/58
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

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-morpholino-benzene diazonium salt and the coupling component is a combination of PA1 (a) 6-methoxy-2-hydroxy-3-naphthoic acid-N(.omega.-aminoalkyl)-amide as a blue coupler, PA1 (b) a 2-alkyl- or 2-aryl-1,3-dihydroxybenzene or a cyanoacetoamide as a yellow coupler, and PA1 (c) at least one compound of the general formula ##STR1## wherein X is zero, =S, =SO, or =SO.sub.2, 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.