US 5,783,373 A · Digital imaging with high chloride emulsions

Abstract

An electronic printing method is disclosed which comprises subjecting a radiation sensitive silver halide emulsion layer of a recording element to actinic radiation of at least 10.sup.-4 ergs/cm.sup.2 for up to 100.mu. seconds duration in a pixel-by-pixel mode. The silver halide emulsion layer is comprised of grains predominantly bounded by {100} crystal faces and internally containing three dopants each selected to satisfy a different one of the following class requirements: (i) a metal coordination complex containing a nitrosyl or thionitrosyl ligand in combination with a transition metal chosen from groups 5 to 10 inclusive of the periodic table of elements, (ii) a shallow electron trapping dopant, and (iii) a iridium coordination complex having ligands each of which are more electropositive than a cyano ligand. A gelatino-peptizer for the grains is employed that contains less than 30 micromoles of methionine per gram. The dopants and peptizer in combination increase contrast and provide a highly unexpected increase in high density contrast.

Claims29

Dependent claims

An electronic printing method which comprises subjecting a radiation sensitive silver halide emulsion layer of a recording element to actinic radiation of at least 10.sup.-4 ergs/cm.sup.2 for up to 100.mu. seconds duration in a pixel-by-pixel mode, wherein the silver halide emulsion layer is comprised of

(1) silver halide grains
(a) containing greater than 50 mole percent chloride, based on silver,
(b) having greater than 50 percent of their surface area provided by {100} crystal faces, and
(c) having a central portion accounting for from 95 to 98 percent of total silver and containing three dopants each selected to satisfy a different one of the following class requirements:
(i) a metal coordination complex containing a nitrosyl or thionitrosyl ligand in combination with a transition metal chosen from groups 5 to 10 inclusive of the periodic table of elements,
(ii) a shallow electron trapping dopant, and
(iii) an iridium coordination complex having ligands which are more electropositive than a cyano ligand, and
(2) a gelatino-peptizer for the silver halide grains that contains less than 30 micromoles of methionine per gram.

5 more elements

An electronic printing method which comprises subjecting a recording element comprised of a white, reflective or translucent support and, coated thereon, a red-sensitized silver halide emulsion layer unit containing a cyan dye-forming coupler, a green-sensitized silver halide emulsion layer unit containing a magenta dye-forming coupler, and a blue-sensitized silver halide emulsion layer unit containing a yellow dye-forming coupler to actinic radiation of at least 10.sup.-4 ergs/cm.sup.2 for up to 100.mu. seconds duration in a pixel-by-pixel mode, wherein at least one of the silver halide emulsion layers is comprised of

(1) silver halide grains
(a) containing greater than 90 mole percent chloride and less than 5 mole percent iodide, based on silver,
(b) having greater than 50 percent of their surface area provided by {100} crystal faces, and
(c) having a central portion accounting for from 95 to 98 percent of total silver and containing three dopants each selected to satisfy a different one of the following class requirement:
(i) confined to the central portion of the grains in a concentration of from 10.sup.-9 to 10.sup.-7 mole per silver mole, based on total silver, a ruthenium or osmium coordination complex containing a nitrosyl or thionitrosyl ligand;
(ii) located in an interior shell which surrounds at least 50 percent of total silver in a concentration of from 10.sup.-6 to 5.times.10.sup.-4 mole per silver mole, based on total silver, a shallow electron trapping dopant which satisfies the formula:
ML.sub.6 !.sup.n (II)
wherein
M is a filled frontier orbital polyvalent metal ion;
L.sub.6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least three of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand;
n is the net charge;
and
(iii) located in an interior shell that surrounds at least 85 percent of total silver in a concentration of from 10.sup.-9 to 10.sup.-7 mole per silver mole, based on total silver, an iridium hexacoordination complex containing six halide ligands, and
(2) a gelatino-peptizer for the silver halide grains that contains less than 5 micromoles of methionine per gram.

11 more elements

Dependencies are inferred from the claim text.

Digital imaging with high chloride emulsions

Life of this patent

Digital imaging with high chloride emulsions

Life of this patent

Abstract

Claims29