Patent GB-682353-A (GB)
Title: Improvements in or relating to photographic diazotype processes and materials
IPC: G03C1/54
Filed: 1950-09-12
Abstract: 682,353. Photographic diazotype material. GRINTEN, L. P. F. VAN DER, GRINTEN, P.A.W. VAN DER, and GRINTEN, K. J. J. VAN DER, (trading as CHEMISCHE FABRIEK L. VAN DER GRINTEN). Sept. 12, 1950 [Sept. 27, 1949], No. 22435/50. Class 98 (ii). Photographic diazotype material contains a light-sensitive diazo derivative of an amine of the general formula wherein R 1  and R 2  are substituted or unsubstituted alkyl, cycloalkyl, aralkyl, or alkenyl groups. The azo-coupling component may be incorporated in the sensitive material or in the developing solution. Values referred to for R 1  and R 2  include butyl, amyl, hexyl, heptyl, vinyl, allyl, pentenyl, and homonaphthyl groups, and alkyl, cycloalkyl, aralkyl, or alkenyl groups substituted by hydroxy, alkoxy, aryloxy, aralkyloxy, acyloxy, amino, alkylamino, dialkylamino, arylamino, aralkylamino, acylamino, carboxylic acid, carboxylic acid ester, carboxylic acid amide, sulphonic acid, sulphonic acid ester, or sulphonamide groups or by halogen atoms. Specific derivatives of 1-diazo- 3-iodobenzene referred to are the 4-diethylamino-, 4-(di -n-butyl) -amino-, 4-(N-methyl : N- cyclohexyl) - amino -, 4 - (N - methyl : N- allyl) - amino -, 4 - (N - ethyl : N - benzyl)- amino -, 4 - (N - methyl : N - phenylethyl)- amino -, 4 - (N - ethyl : N - # - hydroxyethyl)- amino -, 4 - (N - ethyl : N - # - benzoyloxyethyl) - amino -, 4 - (N - methyl : N - # . diethylaminoethyl) - amino 4 - (N - ethyl: N- 3<SP>1</SP> - chlorobenzyl) - amino -, and 4 - diethylamino - 6 - chloro - derivatives. In example 1, superficially saponified cellulose acetate film is impregnated with an aqueous-alcoholic solution of the zinc chloride double salt of 1-diazo-4- diethylamino-3-iodobenzene chloride, tartaric acid, and sodium naphthalene-1 : 3 : 6-trisulphonate, and the material, exposed either below a transparent original or between a screen and a non-transparent original, is developed in an aqueous solution of sodium benzoate, sodium citrate, thiourea, sorbitol, phloroglucinol, and saponin. In example 2, paper is coated with an aqueous solution of the zinc chloride double salt of 1-diazo-4-(N-ethyl : N - # - hydroxyethyl) - amino - 3 - iodobenzene chloride, citric acid, ammonium sulphate, sodium naphthalene - 1 : 3 : 6 - trisulphonate, and gelatin. The exposed material is developed with an aqueous solution of sodium thiosulphate, thiourea, phloroglucinol, resorcinol, borax, isopropylnaphthalenesulphonic acid, and sodium carbonate. The diazo compound may be replaced by 1-diazo-4-(N-ethyl : N-benzyl)- amino - 3 - iodobenzene or 1 - diazo - 4 - (N- methyl : N - cyclohexyl) - amino - 3 - iodobenzene. In example 3, paper is coated with an aqueous solution of the zinc chloride double salt of 1-diazo-4-diethylamino-3-iodo-6-chlorobenzene chloride, citric acid, tartaric acid, tribasic ammonium citrate, and gelatin. The exposed material is developed with the developer of example 2. The use of the 1- diazo - 4 - dialkylamino - 3 - chlorobenzenes and of 1 - diazo - 4 - dimethylamino - 3 - bromobenzene is referred to.