Eastman-kodak Company

Paul T Hahm

Walter Harold Isaac

Richard L Parton

James L Edwards

Pamela M Ferguson

Richard Paul Garnsey

Heinz E Stapelfeldt

Joseph E LaBarca

Hwei-Ling Yau

Lloyd A Lobo

James Stephen Honan

Eric L Bell

Mitchell J Bogdanowicz

Melvin M Kestner

Jerzy A Budz

Jess B Hendricks, Iii

Alberto M Martinez

Erika M Sato

Jess Byrd Hendricks

An imaging element is described comprising one or more hydrophilic colloid layers which include gelatin as a film forming binder which has been chemically crosslinked with a gelatin hardener, wherein at least 20% of the gelatin of at least one of the one or more hydrophilic colloid layers comprises a gelatin prepared from hydrolysis of ossein using sodium or potassium hydroxide, and the gelatin is chemical crosslinked with a gelatin hardener at a level from 70 to 120 effective &mgr;mole hardener per gram of gelatin. Improvements are obtained in the wet mechanical strength of an imaging element comprising gelatin as a binder, without needing to increase the amount of chemical crosslinker with respect to the gelatin. The invention further enables the use of relatively low molecular weight gelatins without compromising the wet mechanical strength of imaging elements and without needing to increase the amount of crosslinker relative to the amount of gelatin. The invention also enables the selective improvement in the wet mechanical properties of layers with a high ratio of non-binder materials to binder without substantially increasing the amount of chemical crosslinker.

Imaging element comprising solubilized collagen gelatin and hardener

A silver halide photographic material comprises a red sensitive layer which contains a high chloride emulsion sensitized with at least two red sensitizing dyes. By adjusting the relative amounts of the two dyes the heat sensitivity of the red layer can be adjusted to match that of the blue sensitive and green sensitive layers to maintain color balance despite thermal fluctuations.

Red sensitizing dye combinations for high chloride emulsions

The invention relates to a photographic emulsion comprising silver iodochloride grains, said grains further comprising iridium, said grains chemically sensitized with gold in an amount of between 120 and 200 mg gold per silver mole and sulfur in an amount between 0.1 and 20 mg sulfur per silver mole, 1-(3-acetamidophenyl)-5-mercaptotetrazole, 1-phenyl-5-mercaptotetrazole, and a disulfide compound represented by the following formula: ##STR1## wherein X is independently --O--, --NH-- or --NR--, where R is a substituent;

Color paper with improved wet abrasion sensitivity

A silver halide photographic material having improved heat sensitivity comprises a red sensitive silver halide emulsion layer the silver halide of which is prepared in the presence of a hexacoordination complex of rhenium, ruthenium or osmium with at least four cyanide ligands and comprising at least about 90 mole percent silver chloride, wherein the emulsion contains at least one red sensitizing dye.

Photographic material having a red sensitized silver halide emulsion

A silver halide photographic material having improved heat sensitivity comprises a red sensitive silver halide emulsion layer the silver halide of which is prepared in the presence of a hexacoordination complex of rhenium, ruthenium or osmium with at least four cyanide ligands and comprising at least about 90 mole percent silver chloride, wherein the emulsion contains a thiosulfonate and a sulfinate or seleninate and at least one red sensitizing dye.

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

The invention is directed to a process for preparation of a silver halide emulsion comprising providing an unsensitized emulsion, heating to carry out chemical sensitization of said emulsion, cooling said emulsion, heating said emulsion a second time to complete heat treatment.

Process for preparation of silver halide emulsion employing a double

The invention is directed to a method of forming a sensitized high chloride silver halide emulsion comprising providing a high chloride emulsion bringing a Lippmann emulsion comprising fine grains of silver bromide doped with metal into contact with said emulsion at a temperature of above 50.degree. C. wherein said metal is present in an amount between 0.001 and 0.25 mg/silver mole, said bromide is present in an amount between 0.05 and 3.0 mole percent bromide and the relationship of bromide and metal dopant is

Doped fine grain silver halide grains as a means of incorporating metal

The invention relates to a photographic element comprising at least one emulsion layer comprising coupler and silver halide grains, adjacent to said at least one emulsion layer a color enhancer layer comprising the same coupler as in said at least one coupler layer and adjacent to said color enhancer layer a Dox scavenging layer.

Photographic element with color enhancing layer adjacent to an emulsion

The invention generally relates to a method of silver halide grain finishing comprising providing a high chloride silver halide grain emulsion and adding a silver bromide fine grain Lippmann emulsion during the chemical sensitization heat cycle for each grain wherein said fine grain emulsion has a photographically useful compound adhered to said fine grain Lippmann emulsion.

Fine grain bromide emulsions as carriers for photographically useful

The invention is accomplished by forming balanced cyan, magenta, and yellow coupler and emulsion mixes. There is at least one layer in which silver halide emulsion has been sensitized to blue light or silver halide emulsion sensitive to green light. Regardless of the color sensitivity of the silver halide layer that contains silver contains a mix of cyan, magenta, and yellow dye-forming couplers. Further, in order to have a black-and-white image that has a lightness such as observed by the human eye in a scene, it is preferred that the ratios of red sensitive emulsion to green sensitive emulsion to blue sensitive emulsion in the photographic element is about 2:3:1.

Color correcting layers consisting essentially of at least one

Chromogenic black-and-white photographic imaging systems

There is described a photographic element in which increased exposure latitude is obtained by having a dye-forming coupler in a non-light-sensitive interlayer between two light-sensitive silver halide emulsion layers. One of the silver halide emulsion layers is sensitive to a first region of the spectrum and contains a dye-forming coupler that forms a dye complementary in color to the region of the spectrum to which that layer is sensitive. The second emulsion layer is sensitive to a second region of the spectrum and contains a second coupler that forms a dye complementary to the second region of the visible spectrum. The exposure latitude in the layer sensitive to the first region of the spectrum is increased when the coupler in the interlayer forms a dye complementary in color to the second region of the spectrum, but as a function of development in the first region of the spectrum.

Photographic material with increased exposure latitude

A multilayer color positive photographic print material with extended exposure latitude contains a limited amount of a spectral sensitizing dye for a first region of the spectrum in a silver halide emulsion layer spectrally sensitized to a second region of the spectrum.

Photographic print material with increased exposure latitude

A novel process and apparatus for multistage contacting of two materials advantageously provides high chemical efficiency and low losses of components of one of the materials caused by that material being carried out of the process with the other material. The process comprises contacting, in a series of stages, a first material with a second material containing a component whose concentration therein is reduced by such contact. Replenishment material is introduced to at least one of the stages to compensate for such concentration reduction. The concentration of the component in the second material is highest in one of the stages, and the first material carries a part of the second material out of each stage. The first material is contacted with the second material at least one once in each stage of the series. Contacting is done in a sequential manner such that, in respect to the first material, contacting occurs in at least one of the stages other than the stage having highest component concentration, then in the stage having highest component concentration, and then in at least one of the stages other than the stage having highest component concentration. Replenishment material is introduced to the stage having highest compnent concentration. Second material is transferred from the stage having highest component concentration to at least one of the other stages.

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Hilton, NY, United States of America

Paul T Hahm