Disclosed is a two-component diazotype material comprising a support and a light-sensitive layer containing (a) at least one diazonium compound derived from p-phenylenediamine and carrying a basic heterocyclic radical in the 4-position and ether groups in the 2- and 5-positions, (b) a coupler component, and (c) an acid stabilizer, the diazonium compound being present in the form of a benzenesulfonate or toluenesulfonate. The disclosed materials have a good storability and are easily developed.

The present invention relates to a two-component diazotype material comprising a support and one or several light-sensitive layers, each of which contains at least one light-sensitive diazonium salt, a coupler component and an acid stabilizer, and at least one of the layers contains a compound which absorbs light in the ultraviolet spectral region. The light-absorbing compound is present in the form of a dye salt of at least one benzothiazole which is converted into its leuco base under the acti...

One component diazotype material is imagewise exposed and developed odorless and curlfree with 0.6-4.5 g/m.sup.2 per square meter of a substantially water free liquid developer in a pressure development or transfer roller apparatus.

This invention relates to a derivative of 2-hydroxy-naphthalene of the general formula ##STR1## wherein A is ##STR2## and X is --OH or ##STR3## and R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are identical or different and are hydrogen, cycloalkyl having up to eight carbon atoms, which is optionally substituted by lower alkyl groups, aralkyl having up to 10 carbon atoms or aryl which is substituted by lower alkyl, lower alkoxy, halogenalkyl or alkyl-substituted amino groups or by halogen, or R.sub.1 ...

A diazotype heat development recording medium of the present invention has excellent shelf life and heat sensitivity. The medium comprises a support and a recording layer which is formed on said support and which comprises a diazo compound, a coupler, an acid stabilizer, a thermal developer, and a polymeric binder. The thermal developer is a salt of an organic or inorganic acid having a primary dissociation constant of 2.times.10.sup.-1 to 1.times.10.sup.-4 and an alkyl-substituted guanidine rep...

This invention relates to an improvement in a developing apparatus, especially as part of a photoprinting machine, for developing diazotype copying material capable of being developed by an atmosphere containing gaseous ammonia and water vapor, including a developing chamber comprising at least one first, heated, inclined evaporator trough to which fresh ammonia is adapted to be fed at one side while ammonia water with a reduced ammonia content is adapted to be drained off at the other side, the...

Resorcinol-mono(aryloxy or arylthio) alkyl ethers, e.g. m-(2-phenoxy-ethoxy)phenol, are. They are non-migrating in diazotype material; when coupled with light-sensitive diazo compounds therein after imagewise exposure of the material they form yellow to orange-yellow, light-stable images having high absorption for U.V. radiation. Compositions of the compounds with diazo compounds and blue-coupling azo couplers, particularly certain monoalkyl-amides of 2-hydroxy-3-naphthoic acid, provide sensitiz...

This invention relates to an improvement in the process for the production of photocopies with two-component diazotype material which cannot be developed by the action of heat alone and which, during continuous passage through a photocopying machine, is first exposed imagewise to light emitted by a mercury lamp and is then exposed, for the purpose of development, to an ammonia/water mixture, in vapor form, in a development chamber, the improvement comprising employing light emitted from a galliu...

A heat developable light-sensitive material comprising at least one layer containing a diazonium salt and a metal-.beta.-diketonate. If desired, these two essential components can be incorporated into different layers of the light-sensitive materials. The heat developable light-sensitive materials forms stable positive images upon exposure and heating.

This invention relates to an improvement in the process for conducting ammonia in a developing apparatus for developing diazotype copying material, wherein exhaust air laden with gaseous ammonia and composed of the developer medium escaping from a developing chamber and air, is conducted in at least one absorption vessel countercurrently to water capable of absorbing ammonia; wherein the ammonia water of relatively low concentration thus obtained is conducted in an evaporator countercurrently to...