Diazo-type material readily developable by heat, having good keeping quality, and producible economically by aqueous coating techniques, comprises a light-sensitive layer containing, with a diazo compound, an acid-reacting stabilizer and a water-soluble hydrophilic organic binder, a substantially water insoluble acylacetamide as azo-coupling component and a substantially water insoluble developing agent, each dispersed as particles of .01-10 microns average size, the developing agent when heated above 100.degree. C. creating a medium wherein coupling occurs, the acylacetamide melting above 50.degree. C. and having solubility of less than 1.times.10.sup..sup.-3 mol/liter in water at 20.degree. C. The acylacetamide is yellow-coupling. Its use with a blue-coupling compound provides material that develops a black image, as by the use of dispersed particles of a N,N'-bis(acylacet)-alkyl-enediamine with 2,3-dihydroxynaphthalene-6-sulfonic acid or a salt thereof.
A thermo-developable type diazo copying material is disclosed comprising a substrate and a photosensitive layer, formed thereon, consisting essentially of a diazo compound, a coupler and a color assistant, wherein said color assistant is at least a member selected from the group consisting of fatty acid amides having the general formula I: (wherein, R.sup.1 is a saturated or unsaturated aliphatic hydrocarbon group having 5 to 24 carbon atoms), N-substituted fatty acid amides having the general formula II: (wherein, R.sup.1 is the same as defined above and R.sup.2 is an alkyl group having 1 to 5 carbon atoms, substituted or non-substituted phenyl group or substituted or non-substituted cyclohexyl group) and N-substituted fatty acid amides having the general formula III: (wherein, R.sup.1 and R.sup.2 are the same as defined above respectively), and said coupler is encapsulated with a member selected from the group consisting of non-polar wax-like substances having a melting point of 50.degree. to 150.degree. C. and hydrophobic vinyl resins having a softening point of 50.degree. to 150.degree. C.
A recording material includes a support having disposed thereon a recording layer including at least: a diazo compound having no diazonio group; a coupler compound that colors by reacting with the diazo compound; and a polymerizable compound.
A thermal development type diazo copying material comprising a support material and a photosensitive layer formed on the support material, which photosensitive layer comprises a diazo compound, a coupling component and a thermo-fusible auxiliary coloring agent, and which coupling component is capsulated by a hydrophobic polymeric material with a softening point ranging from 50.degree. C. to 150.degree. C. selected from the group consisting of hydrophobic polyester resins, hydrophobic cellulose resins, hydrophobic polyamide resins and hydrophobic polyurethane resins.
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-linked hexamethoxymethyl-melamine, and a hydrophilic polymer crosslinkable with said product, e.g. highly hydrolyzed polyvinyl alcohol, and the filler comprises starch particles, e.g. rice starch powder, in a weight proportion to said polymer of at least 5 to 1, and even as high as 30-70 to 1. A water-sealing layer on both sides of the support, or only on a side beneath the light-sensitive layer, renders the material curl resistant.
A positive-working photosensitive mixture containing an o-quinone diazide and a binder is disclosed wherein the mixture contains a compound which is able to form an azo coupling with the o-quinone diazide. A copying material produced with the photosensitive mixture has a high photosensitivity and an exceptional developer resistance. The photosensitive mixture is used in reproduction technique, and also in the field of resists.
