Silver halide photographic light-sensitive systems
申请人:Minnesota Mining and Manufacturing Company
公开号:US04925832A1
公开(公告)日:1990-05-15
A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I) in which R.sup.3 represents an aryl group, one of R.sup.4 and R.sup.5 is a hydrogen and the other is selected from hydrogen, aryl sulphonyl and trifluoroacetyl, G represents carbonyl, sulphonyl, sulphoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidized hydroquinone a cyclization reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X.