E.i. Dupont De Nemours and Company

Agfa Gevaert Nv

Mitsubishi Paper Mills Limited

Reinhold Ruger

Dominic M Chan

Francedillaois Varescon

Satoshi Kaneko

Akira Tanaka

Kenji Hirata

Francois Varescon

It was found that good sensitizing activity in the red spectral region and without residual stain can be obtained with dyes of the general formula (I) ##STR1## wherein R.sub.1 is an alkyl group having 1 to 6 carbon atoms or a heterocyclic ring, R.sub.2 and R.sub.3 are hydrogen, methyl, or methoxy, but at least one of the groups R.sub.2 and R.sub.3 is not hydrogen, R.sub.4 and R.sub.5 are alkyl groups having 1 to 6 carbon atoms that can be substituted with hydroxyl groups, and X.sup.- is an anion. The invention can be used for preparing silver images, for example, for reproduction in preprint operations for black and white or multicolor printing.

Photograhic silver halide material and process for preparing silver

Silver-halide recording material to produce negatives with reduced fog

Silver-halide recording material with improved storage stability to

Silver halide recording material for the production of negative images with ultrahigh contrast. Known silver halide recording materials for the production of negative images with ultrahigh contrast contain hydrazine compounds and contrast-increasing compounds (so-called boosters). A material with a new class of such boosters is being presented here, whereby they contain a sulfonyl urea, sulfonyl urethane or sulfuryl diamide group as well as a tertiary amino group in the molecule. The invention also comprises a process for the production of black-and-white negative images with ultrahigh contrast using the material according to the invention. It is especially useful for reproduction in the pre-press stage.

Tertiary amino contrast increasers for ultrahigh contrast silver halide

Silver halide recording material for making negative images having ultrahigh contrast. Known silver halide recording materials for making negative images having ultrahigh contrast contain hydrazine compounds and contrast enhancing compounds (so-called boosters). The invention involves a material having a new class of such a booster, containing in its molecule at least one nitrile group and a tertiary amino group. The invention also includes a process for making black-and-white negative images having ultrahigh contrast by using the invention's materials. The invention is particularly useful in the pre-press stage for printing.

Silver halide recording material for making negative images having

Negative images of super-high contrast can be formed by developing an exposed silver halide photographic photosensitive material in the presence of at least one compound selected from the compound of formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, R.sup.1 and R.sup.2, R.sup.3 and R.sup.4, R.sup.5 and R.sup.6, or R.sup.1 and R.sup.3, together with nitrogen atom to which they are attached, may form a ring; L.sup.1 and L.sup.2 independently represent an alkylene group, an arylene group or a repeated alkyleneoxy group having at least two repeated alkyleneoxy units, which groups may be optionally substituted; A represents an atom selected from hydrogen, carbon, nitrogen, oxygen and sulfur or a divalent linkage group constituted from these atoms; and m and n represent 0 or 1, and the compound of formula (2) ##STR2## wherein R.sup.7, R.sup.8 and R.sup.9 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R.sup.7 and R.sup.8 together with nitrogen atom to which they are attached, may form a ring; L represents an alkylene group, an arylene group or a repeated alkyleneoxy group having at least two repeated alkyleneoxy units, which groups may be substituted or unsubstituted; and E represents --N(COR.sup.11)--, --N(CONR.sup.12 R.sup.13)--, --NR.sup.14 COCONR.sup.15 --, --N(COCONR.sup.16 R.sup.17)--, --N(SO.sub.2 R.sup.18)-- or --N (COOR.sup.19)--, where R.sup.11 --R.sup.19 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; and R.sup.12 and R.sup.13 or R.sup.16 and R.sup.17 together with nitrogen atom to which they are attached, may form a ring, with the proviso that when E represents --N(COR.sup.11)--, --N(CONR.sup.12 R.sup.13)--, --N(SO.sub.2 R.sup.18)-- or --N(COOR.sup.19)--, R.sup.9 is not a hydrogen atom.

Photographic silver halide photosensitive material and method for

Photographic silver halide materials containing aryl hydrazides as defined and novel aryl hydrazides with a cationic group in the acyl radical enables the preparation of photographic materials that can be developed rapidly to ultrahigh contrast at a relatively low pH value. The photographic materials are useful in reprography, particularly screening for halftone images.

Aryl hydrazides

The present invention relates to photosensitive silver halide recording material with reduced pressure sensitivity. The occurrence of pressure marks can be minimized by protective layers with suitable additives. Other properties of the recording material, such as sensitivity, contrast, and clarity, are not affected adversely. Recording materials with protective layers containing polyolefin oxidates are largely insensitive to pressure marks and have low haze, high sensitivity, and high contrast. The invention's recording materials can be used in all fields of photographic and radiographic image production, especially in reproducing color images in steps preliminary to printing and in recording x-ray images for medical diagnostics.

Photosensitive silver halide recording material with reduced pressure

Photographic silver halide materials containing aryl hydrazides

Photographic silver halide elements containing aryl hydrazides as defined for the production of images with ultrahigh contrast and a new class of aryl hydrazides with a cationic group in the aryl radical as defined. The photographic silver halide elements can be developed at relatively low pH values and have low fog and low tendency to form black spots in unexposed or slightly exposed areas.

Growing community of inventors

Rodermark, Germany

Reinhold Ruger