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AssigneeEastman Kodak Company
InventorsPaul T. Hahm, Alberto M. Martinez, Melvin M. Kestner, Eric L. Bell, Walter H. Isaac
Estimating the term…
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; m and r are independently 0, 1 or 2; X is --H or a cationic species; Ar is an aromatic group; and L is a linking group, where p is 0 or 1.
A photographic emulsion comprising silver iodochloride grains, said grains further comprising iridium, said grains chemically sensitized with gold in an amount of between 0.1 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 ##STR20## wherein X is independently --O--, --NH-- or --NR--, where R is a substituent;
A photographic element comprising a photographic emulsion comprising silver iodochloride grains, said grains further comprising iridium, 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, 1-(3-acetamidophenyl)-5-mercaptotetrazole, 1-phenyl-5-mercaptotetrazole, and a disulfide compound represented by the following formula:
Dependencies are inferred from the claim text.
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Sensitivity-increasing substances: noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g.…
Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein: characterised by the crystal form or…
Characterised by the crystal form or composition, e.g. mixed grain: chloride content
Characterised by the crystal form or composition, e.g. mixed grain: core-shell grains
Term ended 12 Jan 2018 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to a photographic color paper. It particularly relates to a color paper utilizing silver iodochloride emulsion and a disulfide compound, mercapto compound, and gold.
In forming color photographic prints after exposure the prints need to be processed in developing solutions. During development the gelatin containing the silver halide and color couplers is softened and becomes permeable to aqueous solutions. When the color paper is in the developing solution and immediately after removal from the developing solutions, it may be easily scratched. Such scratches to the surface of the color paper will cause an unacceptable image to be formed on the paper. The scratching of the paper leads to fogging of the silver halide grains that are being developed in the paper. This fogging gives rise to nonimagewise grain development and shows up as defects that are lines on the prints.
There have been efforts in the past to minimize the image distortions caused by wet abrasion. Representative of patents relating to these efforts are EP 244,184, U.S. Pat. No. 5,543,281, and copending and coassigned application U.S. Ser. No. 08/729,127 filed Oct. 11, 1996, now U.S. Pat. No. 5,830,631.
The invention has numerous advantages over prior color paper materials. The paper provides improved resistance to defects caused by abrasion during processing. The paper may be handled during processing in a manner which allows more rapid processing and is not subject to minor machine variances and defects in paper handling. The paper exhibits improved image formation as the image is true to the negative that has been exposed onto the paper and is not subjected to non image artifacts being introduced during processing. These advantages also are all available without deterioration in photographic speed from prior color print materials. The color paper of the invention also provides improved imaging in low density areas of the color prints as the background fog level is consistently low as developing does not introduce fog into the print.
The 1-(3-acetamidophenyl)-5-mercaptotetrazole useful in the invention is present in an amount between 1.5.times.10.sup.-5 and 7.0.times.10.sup.-5 mole/silver mole.
The 1-phenyl-5-mercaptotetrazole useful in the invention is present in an amount between 0.01 and 0.7 mg/ft.sup.2.