Colour photographic recording materials giving enhanced light stability and colour purity - having at least one non-diffused pyrazolo-azole type colour coupler

摘要

In colour photographic recording materials with at least one Ag halide emulsion layer on a layer carrier and at least one non-diffused pyrazolo-azole colour coupler, the coupler is of formula (I). In (I), PAZ is the colour coupling gp. of the pyrazolo-azole-type colour coupling range; L is a bonding gp. bound to the non-coupled part of PAZ; R1 is alkyl, cycloalkyl or aryl, R2 is alkyl or aryl and t is 1 or 2. - Pref. the gp. PAZ is a pyrazolo(3,2-c) -1,2,4-triazole-, pyrazole(2,3-b)- 1,2,4-triazole, or pyrazolo(2,3-d)-tetrazole gp.. Pref. the recording material contains a colour coupler of formula (II)-(IV), where X is H or a gp. cleavable by colour coupling; R3, S, T and H is alkyl, aralky, aryl, alkoxycarbonyl, carbamoyl or sulphamoyl where at least one of R3, S and T is a gp. of formula (V); L is a bonding gp. of formula -L1-(L2)l-(L3)m-(L4)n -(L5)o-(L6)p-(L7)q-; L1, L3, L5 and L7 is alkylene, aralkylene or arylene; L2, L4 and L6 = -O-, -NH-, -NHCO-, -CONH, -NHSO2-, -SO2NH- or -SO2-; l, m, n, o, p and q = 0 or 1, and l-m+n-o+p-q = 0.