Eastman-kodak Company

Jerzy A Budz

Jerzy Z Mydlarz

Seshadri Jagannathan

Eric L Bell

Jess B Hendricks, Iii

Richard P Szajewski

Lloyd A Lobo

Sridhar Sadasivan

Rajesh Vinodrai Mehta

John W Boettcher

Anne E Bohan

Yun C Chang

Tommie L Royster, Jr

James P Merrill

Pamela M Ferguson

Alberto M Martinez

Scott F O'Dell

David C Gliottone

Robert P Bourdelais

Peter T Aylward

Xin Wen

Alphonse D Camp

Roger L Lok

Thomas B Brust

Anthony Adin

Ramesh Jagannathan

Roger L Klaus

James L Edwards

Donald L Black

John L Pawlak

Sang H Kim

Allen K Tsaur

George J Burgmaier

Gary L House

Michael R Roberts

Benjamin T Chen

Paul T Hahm

Gary J Mcsweeney

Mark A Whitson

Susan K Mroczek

Michael G Antoniades

Richard E Beal

Heinz E Stapelfeldt

Wai K Lam

Sherrill A Puckett

Debra L Hartsell

Julie K Ligtenberg

Alan R Sadler

A method for forming a radiation-sensitive high chloride silver halide emulsion is described comprising growing cubical silver halide grains having a central portion accounting for up to 98 percent of total silver of the grains which central portion contains an iridium coordination complex dopant, and chemically sensitizing the surface of the emulsion grains at a pH of at least 5.75. Localized addition of the known in the art reciprocity-controlling iridium dopants to an internal portion of the emulsion grains and chemical finishing of such an emulsion at elevated pH conditions improves reciprocity and latent image stability of the formed high chloride emulsions.

High chloride emulsions with optimized digital reciprocity characteristics

The invention relates to a photographic element comprising a base material, at least one exposure side photosensitive silver halide layer, and at least one backside photosensitive silver halide layer, wherein said face side photosensitive layer has lower speed than said backside photosensitive layer, and wherein said base material has a percent transmission of between 35 and 60%.

Duplitized display material with translucent support with specified face to back speed differential

A process for forming a silver halide photographic emulsion is disclosed comprising precipitating silver halide grains in an aqueous dispersing medium to which has been added silver and halide salt solutions while agitating the dispersing medium, wherein the precipitation is done in the presence of an antifoamant compound of the formula RO(CH,CH,O),H wherein R represents an alkyl or alkenyl group containing 10 to 25 carbon atoms, or mixtures thereof, and n represents a mean value of from 2 to 4. The antifoamant material may be delivered to the aqueous dispersing medium as a small particle dispersion, made with the same peptizer used for manufacturing the emulsion or another stabilizer. A further embodiment of the invention is directed towards a silver halide photographic material comprising a support upon which is coated at least one light sensitive silver halide emulsion layer, comprising a silver halide emulsion precipitated in accordance with the described process.

Process for manufacture of photographic emulsion

A process for forming a silver halide photographic emulsion is disclosed comprising precipitating silver halide grains in an aqueous dispersing medium to which has been added silver and halide salt solutions while agitating the dispersing medium, wherein the precipitation is done in the presence of an antifoamant which comprises a hydrophobic group containing nonionic mono- or di-saccharide compound having an HLB number of between 2 and 12. The antifoamant material may be delivered to the aqueous dispersing medium as a small particle dispersion, made with the same peptizer used for manufacturing the emulsion or another stabilizer. A further embodiment of the invention is directed towards a silver halide photographic material comprising a support upon which is coated at least one light sensitive silver halide emulsion layer, comprising a silver halide emulsion precipitated in accordance with the described process.

Process for the preparation of high chloride emulsions containing iodide

A process for the preparation of a radiation-sensitive silver halide emulsion comprised of high chloride cubical host grains containing from 0.05 to 3 mole percent iodide, based on total silver, and epitaxially deposited silver bromide, where the iodide is incorporated in the host grains in a controlled, non-uniform distribution forming a core containing at least 50 percent of total silver, an iodide free surface shell having a thickness of greater than 50 &angst;, and a sub-surface shell that contains a maximum iodide concentration is disclosed, the process comprising: (a) providing in a stirred reaction vessel a dispersing medium and high chloride silver halide cubical grains which form the high chloride host grain cores, (b) adding fine silver iodide grains to the reaction vessel and ripening out the fine silver iodide grains to form the sub-surface shells that contain a maximum iodide concentration, (c) precipitating silver chloride onto the sub-surface shells to form an iodide free surface shell, and (d) depositing silver bromide in an amount of from 0.05 to 5 mole percent, based on total silver, on the host grain surfaces in the presence of an iridium dopant. Also disclosed are photographic recording elements comprising a support and at least one light sensitive silver halide emulsion layer comprising silver halide grains prepared as described above, and 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,ergs/cm,for up to 100&mgr; seconds duration in a pixel-by-pixel mode, wherein the silver halide emulsion layer is comprised of silver halide grains prepared as described above.

Composite silver halide grains with improved reciprocity and process for their preparation

A radiation-sensitive emulsion is disclosed comprised of cubical silver halide grains containing from 0.05 to 3 mole percent iodide, based on total silver, and an iridium coordination complex dopant, wherein (i) the iodide is incorporated in the grains in a controlled, non-uniform distribution forming a core containing at least 50 percent of total silver, an iodide free surface shell having a thickness of greater than 50 &angst;, and a sub-surface shell that contains a maximum iodide concentration, and (ii) the iridium coordination complex dopant is incorporated into the sub-surface shell or into a region of the core extending up to 60% of the total silver into the grain from the sub-surface shell. Speed and reciprocity of iodochloride emulsions can be improved by localized addition of known in the art reciprocity-controlling iridium dopants in relation to high iodide region of the grain. By carefully incorporating reciprocity-controlling dopant within a well defined band within a grain the difficulties of the prior art can be overcome.

High chloride emulsions doped with iridium complexes

A dimethylamine silver chloro-iodide complex is used as a single source precursor for iodide incorporation in silver chloride crystals.

Preparation and use of A dimethylamine silver chloro-iodide complex as a

The invention relates to a photographic emulsion comprising silver iodochloride grains, said grains further comprising osmium and ruthenium, said grains chemically sensitized with gold in an amount of between 0.1 and 120 mg gold per silver mole and sulfur in an amount between 0.1 and 20 mg sulfur per silver mole and a disulfide compound represented by the following formula: ##STR1## wherein X is independently --O--, --NH-- or --NR--, where R is a substituent;

Photographic paper with iodochloride emulsion and disulfide compound

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.

Digital imaging with high chloride emulsions

The invention relates to a photographic element for digital exposure comprising at least one layer comprising an emulsion of cubic silver iodochloride grain wherein said grain has been sensitized with a gold compound and with less than 1 .mu.mole per silver mole of sulfur.

Digital imaging with high chloride emulsions containing iodide

A radiation-sensitive high chloride emulsion is disclosed 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) an 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.

High chloride emulsion that contains a dopant and peptizer combination

A solution containing a dimethylamine silver chloro-iodide complex is added with an antifoggant to a silver chloride emulsion to form a stable AgICl emulsion.

High chloride emulsion with dimethylamine silver chloro-iodide and

The invention provides a method of treating silver chloride emulsions comprising providing a silver chloride emulsion, adding gold and sulfur chemical sensitizers, heating to chemically sensitize said emulsion, cooling to below about 50.degree. C., adding bromide to the emulsion and then after bromide addition adding spectral sensitizing dye.

Process for preparation of digitally imaging high chloride emulsions

An improved image display material comprising a light sensitive tabular grain silver chloride emulsion spectrally sensitized to a peak wavelength of less than about 475 nm, and a method of use comprising the step of optically printing a color image onto the improved color photographic display material is provided. The material and method enable reduced printing times, improved color reproduction and lowered image granularity.

Method of providing viewable images

Growing community of inventors

Fairport, NY, United States of America

Jerzy A Budz