COPPER SEQUESTERING AGENTS OF THE AZOMETHINE SERIES

摘要

1347544 Azomethines ILFORD Ltd 12 July 1972 [12 July 1971] 32619/71 Heading C4P [Also in Division G2] The invention comprises azomethine compounds of the general formula wherein X is -O- or -S- and D completes a phenyl or naphthylene radical which may contain up to two further substituents. They are prepared by condensing one mole of a compound of the general formula wherein X is as above with 2 moles of an optionally mono- or di-substituted 2-hydroxyphenyl- or naphthaldehyde . The compounds are used in silver halide photographic emulsions.