GB650631A - Diazotype photoprinting layers having organic esters and nitriles containing an active methylene group as azo coupling components - Google Patents

Abstract

650,631. Photographic diazotype material. GENERAL ANILINE & FILM CORPORATION. May 28, 1948, No. 14501. Convention date, Aug. 6, 1947. [Class 98 (ii)] Diazotype material comprises a light-sensitive diazonium salt of a p-diamine of the benzene series and an azo-coupling component which is an organic ester or nitrile of the general formula R-CH 2 -CO-R<SP>1</SP>, wherein R is an acyl, carbalkoxy, nitrile, or carbiminoalkoxy group and R<SP>1</SP> an alkoxy, carbalkoxy, aryl, or heterocyclic group, or is sodium ethyl oxalacetate. Other couplers specified are ethyl and methyl acetoacetate, ethyl malonate, ethyl benzoylacetate, ethyl cyanacetate, ethyl acetone dicarboxylate, methyl and ethyl acetone oxalate, methyl cyanpyruvate, # - cyanacetophenone, cyanacetylcoumarone, 1-cyanacetyl-2- naphthol methyl ether, 2-cyanacetyl-3-oxythionaphthene, and ethyl (#-ethoxy: #-imino)- propionate. Numerous diazo compounds are specified, and the sensitizing solution may contain other couplers, stabilizers such as citric and phosphoric acids and thiourea, swelling agents for cellulose ester (e.g. acetate) supports such as isopropanol, and shade intensifiers such as nickel sulphate. The support may be paper, transparentized paper, or cellulose acetate. In examples, transparentized paper is coated with an aqueous ethyl alcohol solution containing thiourea, citric acid, phosphoric acid, zinc chloride, and (1) ethyl acetoacetate and N- methyl: N - # - hydroxyethylamino - p - benzenediazonium chloride-ZnCl 2 double salt; (2) ethyl acetoacetate and N-phenylamino-p-benzenediazonium acid sulphate; (3) methyl acetoacetate and N: N-diethylamino-p-benzenediazonium chloride-ZnCl 2 double salt; (5) ethyl cyanacetate and 1-(N-ethylamino)-2-methyl-4- benzenediazonium chloride-ZnCl 2 double salt; (6) ethyl cyanacetate and 1-benzoylamino-2 :5- diethoxy - 4 - benzenediazonium chloride - ZnCl 2 double salt; (7) ethyl malonate and N-ethylamino - p - benzenediazonium chloride - CdCl 2 double salt; (8) ethyl acetoacetate, 2 : 3- dihydroxynaphthalene - 6 - sulphonic acid, 2 : 3 - dihydroxynaphthalene, and N : N - diethylamino - p - benzenediazonium chloride - ZnCl 2 double salt; (9) ethyl-(#-ethoxy: #-imino)- propionate and N - ethyl : N - # - hydroxyethylamino - p - benzenediazonium chloride- ZnCl 2 double salt; (10) ethyl sodium acetone oxalate and N'- methyl : N - # - hydroxyethylamino - p - benzenediazonium chloride - ZnCl 2 double salt; (11) #-cyanacetophenone and N: N - dimethylamino - p - benzenediazonium chloride - ZnCl 2 double salt ; and (12) 2 - w - cyanaceto - 3 - oxythionaphthene and 1 - (N - ethylamino) - 2 - methyl - 4 - benzenediazonium chloride-ZnCl 2 double salt.