Minnesota Mining and Manufacturing Company

Cristina Soncini

Sharon Mary Simpson

Raffaella Biavasco

Larry R Krepski

Kumars Sakizadeh

Kim Marie Vogel

Massimo Bertoldi

Marco Bucci

Lori S Harring

Daniel E Mickus

John R Boon

Mark B Mizen

Stefano Mana

Ivano Delprato

Ivo Zullo

Salvatore Selvaggio

Antonella Celada

Rino Feduzi

Sahron M Simpson

Massino Bertoldi

A photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:

Chromogenic leuco redox-dye-releasing compounds for photothermographic

The addition of 3-substituted-5-mercapto-1H-tetrazoles to silver halide photothermographic emulsions improves the post-processing stability of the emulsion.

Post processing stabilization of photothermographic emulsions

The present invention relates to a process for improving the ageing properties of a silver halide photographic element, free of photolytically generated latent images, comprising a support bearing at least one light-sensitive silver halide emulsion layer and at least one light-insensitive layer, the silver halide light-sensitive emulsion layer including negative acting surface latent image-type silver halide grain in association with a contrast promoting agent and a hydrazine compound, by adding a total amount of at least 0.40 grams per square meter of dextran to at least said light-sensitive silver halide emulsion layer and/or to at least said light-insensitive layer.

Ageing improvements of photographic elements comprising dextran

Phothermographic material capable of producing a high density cyan image upon image-wise exposure and thermal development at a relatively low temperature and for a short period of time. The photothermographic material of the invention comprise coated on a support base at least one light-sensitive emulsion layer containing: (a) a binder; (b) a silver source material; (c) a light sensitive silver halide in catalytic proximity to said silver source material, wherein said emulsion layer or an adjacent layer thereto comprises a chromogenic cyan leuco dye. The photothermographic material of the invention may be used to obtain good cyan image of suitable density in single color or multicolor photothermographic articles. At the same time the chromogenic leuco dye is stable enough not to be oxidized by oxygen of the air or by simple heating and to limit the fog formation after development.

Cyan chromogenic leuco dyes for photothermographic materials

The addition of simple merocyanine spectral sensitizing dyes to silver halide photothermographic emulsions improves the stability of the emulsion during storage before heat processing.

Thermally developable photographic elements

The addition of 3-substituted-5-alkylthio-1,2,4-triazoles to silver halide photothermographic emulsions improves the post-processing stability of the emulsion.

Post-processing stabilization of photothermographic emulsions

The addition of certain 5-mercapto-1,2,4-triazoles to silver halide photothermographic emulsions improves the post-processing image stability of those emulsions.

Post processing stabilized photothermographic emulsions

Growing community of inventors

Savona, Italy

Cristina Soncini