A process for the development, following imagewise exposure, of two component diazotype material in sheet form constituted by a base carrying a light-sensitive coating containing a diazonium salt, a coupler, and an acid coupling inhibitor, said process comprising, while advancing the material continuously at a rate of 1 to 20 meters per minute, first applying to the exposed light-sensitive coating a non-volatile alkaline, inorganic developer liquid having a pH value of at least 10 at a coating w...

A two-component diazotype material, composed of a support and a light-sensitive layer which is applied thereto and contains a polymeric binder, a diazonium salt, a coupler, an acid stabilizer and conventional additives, wherein the support is a biaxially oriented polyester film and the polymeric binder comprises a mixture of about 10-60 percent by weight of a polymer or copolymer of vinyl acetate, for example, a copolymer of vinyl acetate and crotonic acid, and about 40-90 percent by weight of a...

Diazotype material having a thin light-sensitive layer that is developable excellently by a limited application (1.5 to 4.5 cm.sup.3 /m.sup.2) of a buffered aqueous solution of an azo component, and which adheres well to the support even in moist condition, can be obtained by providing on a paper support a light-sensitive layer containing a binder and filler with at least one diazo compound, when the binder comprises a condensation product of an amino compound with formaldehyde, e.g. cross-linke...

This invention relates to an improvement in a two-component diazotype material, composed of a support and of a light-sensitive layer applied to the support, the layer containing at least one benzene diazonium salt as the light-sensitive component and at least one coupler, the improvement comprising the combination of at least one 2,5-dialkoxy-4-mercaptobenzene diazonium salt and at least one compound of the general formula ##STR1## in which R.sub.1 and R.sub.2 are identical or different and deno...

Negative-working diazography material is comprised of (i) at least one diazonium compound, (ii) at least one acid labile enolic, preferably phenolic blocked-coupler adapted to be converted in the presence of acid to an active azo-coupling component, and (iii) at least one light-sensitive acid progenitor. The diazonium compound can itself concurrently function as the acid progenitor, e.g., when complexed with a Lewis acid. Upon imagewise exposure to light, acid catalyst is photochemically liberat...

A wet type developer for use in diazo-type copying consisting essentially of A. 0.2 to 5.0 percent by weight of an azo coupling component; B. 0.5 to 10.0 percent by weight of an alkali agent; C. 0 to 20.0 percent by weight of a reducing agent; D. 0 to 0.5% by weight of surface active agent; and E. the balance being water, The azo coupling component being a compound of the formula ##SPC1## Wherein Z.sub.2 is I. a hydroxy aryl group, Ii. a hydroxy aryl group substituted by a SO.sub.3 H, COOH, SO.s...

This invention describes diazotype photoprinting material containing as a coupling component a compound of the formula: ##SPC1## Wherein R.sub.1 and R.sub.2 are hydrogen, alkyl, phenyl, or taken together form a heterocyclic ring and Y is an alkyl or alkoxy. This photoprinting material gives a dense dye-image having high preservability. It could be developed by both dry and wet development methods.

Sensitizing agents for ammonia vapor developable black-line two-component diazotype sensitizing formulations comprising diazotized derivatives of 4-N-pyrrolidinyl-3-alkyl-paraphenylenediamine are employed with a mixture of coupling components which include an acetoacetamide, a naphthol, a diresorcyl compound alone or also with resorcinol.

Apparatus and method for development of two-component diazotype sheets and webs. The developing solution is applied to the moving surface of the exposed diazo paper by the wiping action of a porous applicator pad that is kept damp and replenished by capillary, wicking action through the pad from a developer solution reservoir. The range of application extends from slightly less than 4 grams per square meter to just over 30 grams per square meter. A mechanism may be incorporated in the apparatus ...

A diazotype material useful for making duplicates of continuous tone originals, such as X-ray films, comprising a transparent film support having a coating of a layer thereon consisting essentially of at least two light-sensitive diazo compounds having different photolysis rates, couplers for the diazo compounds, an ultraviolet radiation absorbing material and homogeneously distributed in the layer at least about 7% by weight, based on the weight of lacquer, of an inert particulate material such...