Patent ID: 6261758
Filing Date: 2001-07-17
Classification: G03C

Abstract:
A process for producing tabular silver bromide-iodide and silver bromide-chloride-iodide emulsions with an aspect ratio .gtoreq.2, an iodide content from 1 to 40 mol % and a chloride content from 0 to 20 mol %, which comprises the process steps of (a) silver halide nucleus precipitation, and (b) at least one further precipitation of silver halide, at least one aromatic five- or six-membered, heterocyclic compound, which is free from--SH--, --SSO.sub.2 H-- and --SSO.sub.2 R groups, is added in an amount from 10.sup.-9 to 10.sup.-4 mol silver during nucleus precipitation or during the precipitation of an inner zone of the silver halide grain which is different from the nucleus precipitate.