Patent ID: 6200743
Filing Date: 2001-03-13
Classification: G03C

Abstract:
Spectrally sensitized emulsion sensitive to irradiation wherein said emulsion comprises {111} tabular silver halide grains rich in silver bromide having an average aspect ratio of at least 2 with two flat parallel {111} crystal faces accounting for a total projective surface of said parallel crystal faces in said emulsion of at least 50%, characterized in that a site-directing compound is present, satisfying the general formula (I.1) or (I.2) ##STR7##wherein each of the substituents R.sup.1 -R.sup.4 independently represents hydrogen, an alkyl, an aryl or an alkyl;wherein R.sup.1 and R.sup.2 and/or R.sup.3 and R.sup.4 may form a benzoring, which, if substituted, has the same or different substituents as R.sup.1 -R.sup.4 ;wherein R represents an alkyl, an aryl or an aralkyl group;wherein R' represents hydrogen, an alkyl, an aryl or an aralkyl group; and wherein cations or anions are present as charge compensating ions.