A diazo-type copying paper which is prepared by coating, on a light-transmitting base, a light-sensitive composite containing a diazonium compound obtained from 1-amino-4-dialkylamino-monochloro benzene and also containing a coupling component consisting of 2-alkyl-5-alkyl-4-morpholino-methyl-phenol, provides an excellent intermediate copy when developed according to the wet development process.

A two-component diazotype photographic copying material for wet development and having a light-sensitive layer which contains at least one light-sensitive aromatic diazo compound and also contains at least one each of the three kinds of coupling components which are adapted to form a blue dye, a bluish-violet dye and a yellow dye, respectively, when said coupling components are made to react with said diazo compound, is capable of providing a copied image in a very clear black color when develop...

This invention relates to 2-hydroxy-3-naphthoic acid amides of the general formula: ##STR1## wherein R.sub.1 is hydrogen, a substituted or unsubstituted alkyl, cycloalkyl, aralkyl, or aryl group, and R.sub.2 and R.sub.3 are identical or different and are hydrogen, a substituted or unsubstituted alkyl, cycloalkyl, aralkyl, or aryl group, or, together with the nitrogen atom to which they are attached, a substituted or unsubstituted heterocyclic group.

This invention relates to an improvement in the process for developing a two-component diazotype material on a non-metallic carrier and which can be developed by the influence of heat, and contains, in particular, compounds which can be decomposed under the influence of heat and produce in this process an alkaline environment, the heat influence being produced by electromagnetic radiation radiated from a power transmitter, the improvement comprising subjecting the diazotype copying material to m...

In a photoprinting machine including a developing chamber in which a web of exposed diazotype paper continuously fed at an adjustable speed is developed with a developer medium composed of a vaporous ammonia/water mixture, an after-treating chamber following next in the direction of feed of the diazotype paper and which is connected with a device for removing ammonia-containing exhaust air, and a device for expelling developer medium from the developed diazotype paper. The expelling device inclu...

Diazotype material which after imagewise exposure can be developed by applying onto its sensitized surface between 1.5 and 4.5 cm.sup.3 per square meter of developing solution, consists of a paper support, the same side of which is coated successively with a sealing layer containing as a filmforming binder polyvinylacetate or a copolymer of styrene with butadiene and a light-sensitive layer having a dry weight of at most 8 g per square meter and comprising a diazonium compound, polyvinyl alcohol...

A process for diazo-type multicolor reproduction according to which it is possible to obtain multi-colored copies in which portions corresponding to predetermined portions of an original area colored selectively in different hues without substantial mingling of colors, by conducting the heat transfer at relatively low temperatures (for instance, at 60.degree. - 80.degree.C.), and a color former to be used in such process, which comprises a thermosublimative coupler and a thermosublimative, organ...

A multicolor image-forming method which comprises image-exposing a light-sensitive heat-sensitive recording material having a diazo compound and a coupling component on a support using a positive image followed by developing to form a color image, image-exposing a light-solubilizing color image-forming material having a coloring material on a substantially transparent support using a positive image followed by developing to form a color image, and superposing the light-solubilizing color image-f...

The invention relates to new diazotype materials of which the sensitive layer contains, as a base generator, a compound comprising a basic part and an acid part, the acid part being a 2-carboxycarboxamide group and the basic part consisting of an alkali metal cation or alkaline earth metal cation or a tetraalkylammonium cation. These diazotype materials develop rapidly and possess an excellent resistance to ageing.