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Colour photographic element containing improved heterocydic film speed raising compound

A color photography, compound technology, applied in the direction of photosensitive materials, optics, multi-color photography process, etc., can solve the problem of loss, insufficient to cause the increase of photosensitive speed, etc.

Inactive Publication Date: 2004-08-04
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the triazoles described therein have an insufficient Log Kow to cause an increase in photospeed, and as noted (column 7, lines 12-18), their deposition must be minimized to avoid excessive speed loss

Method used

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  • Colour photographic element containing improved heterocydic film speed raising compound
  • Colour photographic element containing improved heterocydic film speed raising compound
  • Colour photographic element containing improved heterocydic film speed raising compound

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0223] photographic example

[0224] A multilayer film demonstrating the principles of the invention was produced by coating a cellulose triacetate film support with the following layers (coverage expressed in grams per square meter, emulsion size measured by disc centrifugation and expressed in diameter x thickness in microns Report). Surfactants, coating aids, emulsion addenda (including 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene), sequestrants, thickeners, lubricants, matting Agents and shade dyes are added to the appropriate layers, as is well known in the art.

[0225] Sample ML-1:

[0226] Layer 1 (antihalation layer): 1.08 gelatin, 0.150 colloidal gray silver; 0.097 ILS-1; 0.029 DYE-1; 0.065 DYE-2; 0.021 DYE-3; 0.025 CH-1 and 0.075 UV-1.

[0227] Layer 2 (slow cyan layer): blend of two red-sensitized (all using a mixture of RSD-1 and RSD-2) platelet silver iodobromide emulsion: (i) 0.81 x 0.11 μm, 4.5 mol %I, 0.400, (ii) 0.62 x 0.111 μm, 4.1 mol% iodide, 0.175; cya...

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Abstract

Disclosed is a color photographic element comprising at least one light sensitive silver halide emulsion layer containing a compound that does not react with oxidized developer, has a Log Kow high enough to improve speed, compared to the same layer without the compound, and comprises (1) a thiadiazole, or (2) an oxadiazole, or (3) a 1,2,4 triazole bearing an amido substituent, and does not contain a hydroxyl or thiol group or their tautomeric equivalents on the azole ring.

Description

technical field [0001] SUMMARY OF THE INVENTION The present invention is a silver halide photographic element having addenda which provide increased photospeed with little or no reduction in interimage effect and improved melt-hold stability. Background technique [0002] A long-standing goal of color photographic starting materials is to maximize the overall response to light while maintaining the lowest possible granularity. Increasing photographic sensitivity to light, commonly referred to as photographic speed, can improve images captured in low-light situations or improve detail in shadowed areas of an image. In general, the overall sensitivity provided by a photosensitive silver halide emulsion in such systems is determined by the size of the emulsion grains. Larger emulsion particles capture more light. During development, the captured light is eventually converted into the dye deposits that make up the reproduced image. However, the graininess exhibited by these d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03C7/305G03C1/10G03C1/28G03C7/392
CPCG03C7/39256G03C7/39276G03C7/39272
Inventor L·E·弗里德里希P·A·阿尔维J·A·波吉B·A·克拉克C·E·赫克勒S·P·辛格
Owner EASTMAN KODAK CO
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