GB415081A - Improvements in processes for the production of light sensitive layers by means of diazo compounds - Google Patents

Abstract

The diazo compounds derived from halogenbenzylaminoarylamines are used as the sensitive material in photographic diazotype processes. The bodies are obtained by diazotizing compounds of the general formula NH2--R--NH.CH2--R<1>, where R is a substituted or unsubstituted aryl nucleus and R<1> is a halogenized benzene nucleus which may be further substituted, e.g. with alkyl, halogen cyano, alkoxy or aryloxy groups. In an example, the sensitizing solution consists of 4-(dichlorbenzyl-2<1> : 6<1>)-amino-1-diazobenzene, thiourea, boric acid, aluminium sulphate, and an organic acid such as tartaric, citric, acetic, maleic, or succinic acid. The diazo compound may be replaced by the corresponding 2<1> : 4<1>-dichlor derivative, by diazotized 1-amino-4-(brom-2<1>-chlor-6<1>-benzyl)-aminobenzene, or by diazotized 1-amino-4-(dibrom-2<1> : 6<1>-benzyl)-aminobenzene. 4-(Dichlorbenzyl-2<1> : 6<1>)-amino-1-diazobenzene is prepared by coupling diazotized sulphanilic acid with 2 : 6-dichlorbenzylaniline in acetic acid, reducing with hydrosulphite, diazotizing in hydrochloric acid, and decomposing the nitrosodiazo compound formed, by heating.