Agfa-gevaert

Agfa Gevaert Nv

Kathy Elst

Johan August Loccufier

Paul R Callant

Dirk Vandenbroucke

Ann L Verbeeck

Gina C De Lamper

Ilse Mans

Gunter Helling

Rene M De Keyzer

Marc Van Den Zegel

Eddy A Michiels

Govert De Baecke

Luc J Heremans

Freddy Hendrickx

Andr&eacute; Roefs

Guy Vastenaeken

Rudy Goedeweeck

Yves Vanmeenen

A black-and-white silver halide photographic film material has been provided, wherein said material has first and second major surfaces, at least one of which is coated with at least one light-sensitive silver halide emulsion layer, overcoated with a protective antistress layer, wherein said emulsion layer(s) have chemically and spectrally sensitized &lcub;111&rcub; tabular hexagonal emulsion grains or crystals rich in silver bromide in an amount covering at least 50% of the total projective grain surface of all grains, wherein said grains further have an average equivalent volume diameter in the range from 0.3 &mgr;m up to 1.5 &mgr;m and an average grain thickness of less than 0.30 &mgr;m, and an average amount of iodide from 0.05 mole % up to 0.5 mole % based on silver over the whole grain volume, characterized in that said material comprises, in an amount of at least 0.5 mmole per mole of silver halide coated, a heteroaromatic compound according to the general formula (I), presented in the claims and in the detailed description.

Film material exhibiting a &ldquo;colder&rdquo; blue-black image tone and improved preservation characteristics

A chemically and spectrally-sensitized emulsion has been described, wherein said emulsion comprising (100) cubic silver halide grains with an average edge length of from 0.2 up to 1.5 &mgr;m, has been spectrally sensitized by addition at least three trimethine dyes: a main spectral sensitizer added in an amount of at least 85 mole % of all spectral sensitizers added, followed by adding a second spectral sensitizer in an amount of not more than 10 mole % and a third spectral sensitizer in an amount of at most 1 mole % wherein at least said main spectral sensitizer has two benzoxazole rings in its chemical structure, at least said third spectral sensitizer has two benzimidazole rings in its chemical structure and wherein the said second spectral sensitizer has a structure more sterically hindered than the structure of the other spectral sensitizers. A light-sensitive silver halide photographic film material coated with such emulsion and a radiographic screen/film combination has been described.

Radiation-sensitive emulsion, silver halide photographic film material and radiographic intensifying screen-film combination

A radiographic silver halide film material and a radiographic screen/film combination has been disclosed, said material having in at least one light-sensitive layer thereof an emulsion comprising &lcub;111&rcub; tabular silver halide grains rich in silver bromide, spectrally sensitive to irradiation in the wavelength range between 540 and 555 nm by the presence of a combination of at least one J-aggregating spectrally sensitizing cyanine dye according to the formula (I) and of at least one additional cyanine dye providing a shift of maximum absorption wavelength of said combination of less than 10 nm versus in the absence thereof, wherein said additional cyanine dye is at least one monomethine cyanine dye according to the formula (II), essentially having a solubilizing group or a latent solubilizing group, said dyes having been given in the description and in the claims of the present invention.

Radiographic film material and intensifying screen-film combination

A method has been described for preparing an ultrathin tabular grain emulsion rich in silver bromide, having &lcub;111&rcub; major faces, wherein tabular grains having a thickness of less than 0.08 &mgr;m exhibit an average aspect ratio of more than 5:1 and account for at least 75% by number of hexagonal grains and a coefficient of variation on average equivalent surface area of less than 0.50. The process is characterized in that during formation, (a) pH is maintained from 0.8 to 10; (b) a gelatino-peptizer is present in a concentration of 0 to 50 g per liter of dispersing medium, and (c) pBr having a value of at least 1.8 is maintained during grain nucleation and pBr is maintained at less than 2.4 during growth provided that a gelatin peptizer which is free from calcium ions and has a methionine content of less than 30 micromoles per gram of gelatino-peptizer is present.

Method of preparing ultrathin light-sensitive tabular grain emulsions rich in silver bromide

A method has been described for processing an exposed black-and-white silver halide photographic film material comprising in a hydrophilic light-sensitive layer thereof a binder and silver halide grains being &lcub;111&rcub; or &lcub;100&rcub; tabular silver bromo(chloro)iodide or silver chloro(bromo)iodide grains having an average aspect ratio of from 1.2 to 50 and having a silver iodide content of less than 3 mole % based on silver with at least part of it at their grain surface, said method comprising the steps of developing in a developer, fixing in a fixer, rinsing and drying, characterized in that in said developing step the developer comprises an alkali soluble agent having preventing silver dissolution properties, being a mercapto azole compound as presented herein.

Processing method providing cold blue-black image tone for black-and-white materials having silver halide grain emulsions

Radiographic UV/blue film material and intensifying screen-film combination

A method has been described of chemically sensitizing a silver halide emulsion having silver halide grains and a binder, comprising the steps of adding thereto, besides a chemically sensitizing agent providing sulphur, an organo-tellurium sensitizing compound providing tellurium in a molar ratio amount versus sulphur of less than 0.30. A light-sensitive silver halide photographic element has also been described which has been made highly sensitive by chemically sensitizing a silver halide emulsion which has been made highly sensitive by the method described hereinbefore.

Photosensitive silver halide element comprising chemically sensitized emulsion grains and method to prepare them

A method has been disclosed for preparing a tabular silver halide emulsion wherein tabular silver halide grains having an average aspect ratio of at least 2:1, an average crystal diameter from 0.3 &mgr;m to 3.0 &mgr;m and an average thickness of less than 0.50 &mgr;m account for at least 50% of the total projective surface area of said grains, said method comprising the steps of precipitating, spectrally sensitizing and chemically ripening said grains, characterized by spectrally sensitizing by adding to the emulsion grains before chemically ripening at least one J-band aggregating spectrally sensitizing dye and at least one non-J-band aggregating dye. A light-sensitive silver halide emulsion having at least one J-band aggregating dye and at least one non-J-band aggregating dye comprising said tabular grains has also been disclosed as well as a light-sensitive silver halide photographic X-ray material comprising a support, at least one hydrophilic colloid layer on at least one side of said support and one or more photosensitive layer(s) comprising the said silver halide photographic emulsion and a radiographic screen-film combination comprising at least one X-ray intensifying screen in operative association with the said material.

Method to spectrally sensitize tabular silver halide grains

A light-sensitive silver halide photographic emulsion has been disclosed, said emulsion comprising a binder and core-shell tabular grains, wherein said core is more rich in silver bromide than said shell, characterized in that said grains contain, in the core thereof representing an amount of precipitated silver halide extending up to less than 50% of all precipitated silver halide, a ruthenium complex compound as a sole complex compound providing shallow electron traps.

Shallow electron trap dopants in silver halide tabular grain emulsions for use in medical diagnostic imaging materials

Silver halide emulsion having improved sensitometric characteristics

A light-sensitive silver halide photographic emulsion has been described comprising a binder and tabular grains rich in silver bromide, characterized in that said grains contain as a dopant RhCl,(SCN),, wherein each of x and y are integers having a value of at least 1 and less than 6 so that x&plus;y equals 6.

Light-sensitive emulsion having tabular grains rich in silver bromide doped with thiocyanate complexes of rhodium

Radiation-sensitive emulsion, light-sensitive silver halide photographic film material and radiographic intensifying screen-film combination

A photosensitive image-forming element has been provided, comprising on a support at least one photosensitive layer containing silver halide crystals which are internally doped with a transition metal complex (more preferably a metal halide chalcogenic cyanate complex, further called a `MHCC`-complex) forming a deep and permanent electron trap, wherein said transition metal complex satisfies the general formula (1) as disclosed in the claims and in the description.

Photosensitive image-forming element containing silver halide crystals

A method is disclosed for preparing an emulsion having grains rich in silver bromide in the presence of gelatin as a protective colloid in a reaction vessel wherein a yield of more than 250 g of precipitated silver nitrate per liter of reaction vessel mixture is attained, wherein at least 70% of a total projected area of all grains is provided by {111} tabular grains having an average aspect ratio of more than 2:1 and an average thickness of from 0.05 up to 0.30 .mu.m and wherein a ratio by number of percentage amounts of hexagonal tabular grains to triangular tabular crystals present is more than 10:1, said method comprising following steps:

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Kessel, Belgium

Kathy Elst