Light-sensitive emulsion having (100) tabular grains rich in sil

Details Light-sensitive emulsion having (100) tabular grains rich in sil Light-sensitive emulsion having (100) tabular grains rich in sil

1999-02-24

2000-10-24

Baxter, Janet

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

G03C 1015

Patent

active

061365246

ABSTRACT:
A light-sensitive silver halide photographic emulsion has been described, said emulsion comprising a colloidally stabilizing binder and {100} tabular silver halide grains containing at least 50 mole % of silver chloride, wherein at least 70% by number of all grains is provided by said tabular grains, exhibiting an average aspect ratio of at least 5 and an average equivalent circular grain diameter of at least 0.3 .mu.m, wherein said tabular grains have an average thickness of less than 0.25 .mu.m for at least 75% by number of all tabular grains.
In order to prepare said emulsion a method has been disclosed comprising performing at least three distinct precipitation steps in an aqueous medium in a reaction vessel, followed by desalting by means of washing after flocculation or by means of ultrafiltration, wherein said three distinct precipitation steps consist of a nucleation step followed by a first and a second growth step, said method being further characterized by introducing in the said reaction vessel, after the first growth step, of a block-copolymer according to the formula (I) as described in the detailed description and in the claims.

REFERENCES:
patent: 5252453 (1993-10-01), Tsaur et al.
patent: 5272048 (1993-12-01), Kim et al.
patent: 5707793 (1998-01-01), Oyamada
patent: 5763151 (1998-06-01), Brust et al.

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