Patent ID: 6737228
Filing Date: 2004-05-18
Classification: G03C,Y10S

Abstract:
Black-and-white silver halide photographic film material having first and second major surfaces coated with at least one light-sensitive silver halide emulsion layer overcoated with a protective antistress layer, said emulsion layer(s) having chemically and spectrally sensitised {111} tabular hexagonal emulsion grains or crystals rich in silver bromide in an amount covering at least 50% of the total projective grain surface of all grains, said grains further having an average equivalent volume diameter in the range from 0.3 &mgr;m up to 1.5 &mgr;m, an average grain thickness of less than 0.30 &mgr;m, and an average amount of iodide from 0.05 mole % up to 0.5 mole % based on silver over the whole grain volume, characterized in that said material comprises, in an amount of at least 0.5 mmole per mole of silver halide coated, characterized in that said protective layer, said light-sensitive layer(s) or both said protective layer and said light-sensitive layer(s) comprise, in an amount of at least 0.5 mmole per mole of silver halide coated, a heteroaromatic compound according to general formula (I): whereinM represents a hydrogen or an element providing a counterion; Z represents atoms required in order to form a five-or six-membered heteroaromatic ring; and R represents a substituent representing an amino-ether or amino-alcohol, provided that R is not an azacrown ether; wherein said amino-ether or amino-alcohol substituents comprise a ternary amine, according to general formula (II): wherein R1 and R2 each independently represents a substituted or unsubstituted aliphatic chain and R3 represents hydrogen or a substituted or unsubstituted aliphatic chain, and wherein each of R1, R2 and R3 may each, independently, form a ring.