Minnesota Mining and Manufacturing Company

John R Boon

Sharon Mary Simpson

Kumars Sakizadeh

Marco Bucci

Cristina Soncini

Massimo Bertoldi

John M McQuade

Gregory J Wagner

Sahron M Simpson

Massino Bertoldi

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

Supersensitization of silver halide emulsions is effected by the addition of a metal chelating agent after chemical sensitization or a combination of phenylmercaptotetrazoles and a metal chelating agent to a spectrally sensitized emulsion. The contrast of the emulsion may also be increased by the addition of this combination of materials after chemical and spectral sensitization.

Supersensitization of silver halide emulsions

Full color photographic images are produced by exposure of a radiation-sensitive element comprising at least three silver halide emulsion layers. At least two silver halide emulsion layers are sensitized to infrared radiation. Selectively absorptive filter layers and/or differential sensitivities between emulsion layers are used to prevent exposure of other layers to radiation used to expose a single layer.

Color photographic element containing three silver halide layers

As silver is the most expensive individual component in photographic film, it is desirable to reduce the quantities of silver in such materials. The addition of a certain class of phenolic derivatives has been found to enhance the contrast generated by dyes in color photographic emulsions. Emulsions containing these phenolic compounds can use less silver and produce the same optical density as emulsions with higher silver concentrations.

Growing community of inventors

Woodbury, MN, United States of America

John R Boon