Black-color forming two-component type diazo copying material

Abstract

A two-component type diazo copying material according to this invention, which comprises a support and a photosensitive layer formed thereon, said layer consisting essentially of a diazo compound expressed by the following general formula I and a coupler mixture consisting of a compound expressed by the following formula II, a compound expressed by the following general formula III and a compound expressed by the following general formula IV, can form a genuine black-color image and is especially optimum for preparing a secondary original used in electrophotographic copying machines. General formula I ##STR1## (wherein R represents alkyl radical having 1 to 5 carbon atoms; R.sub.1 and R.sub.2 represent substituted or non-substituted alkyl radical, aralkyl radical or cycloalkyl radical, or R.sub.1 and R.sub.2 may form a heterocyclic ring together with the nitrogen atom to which they bond; and X represents anion.) ##STR2## (wherein X is of no account or represents O, S, SO or SO.sub.2.) ##STR3## [wherein R.sub.3 represents hydrogen, alkyl radical having 1 to 4 carbon atoms or halogen; R.sub.4 represents hydrogen, --(CH.sub.2).sub.n OH (wherein n is an integer ranging from 2 to 4) or ##STR4## (wherein n is an integer ranging from 2 or 4; R.sub.5 and R.sub.6 represent alkyl radical having 1 to 4 carbon atoms, or R.sub.5 and R.sub.6 may form heterocyclic ring together with nitrogen atoms to which they bond.)]

Dependencies are inferred from the claim text.