Minnesota Mining and Manufacturing Company

Richard C Cotner

Kumars Sakizadeh

Raymond J Kenney

Takuzo Ishida

David C Weigel

William G McCallum

The present invention provides a photographic element developed in the presence of a hydrazide which displays high contrast but low levels of pepper fog. The novel silver halide photographic elements comprise, in at least one layer of the element, a pepper reducing agent. The pepper reducing agent of this invention is a compound having at least one nitrogen containing, heterocyclic ring group and at least one carbonyl group in or attached to said ring. The pepper reducing agents preferably are selected from the group containing 2,5-piperazinediones; glycol urils; 2,3-pyrazinedicarboxamides; 3-iminoisoindolinones; or glutarimides.

Hybrid graphic arts films with reduced occurrence of pepper fog

Method and apparatus for producing image reproducing materials, especially newspaper printing plates or proofs having a predetermined image. A photothermographic material having a polymeric base supporting at least one photosensitive layer, capable of being developed by heat, is exposed to radiation at a first wavelength modulated in accordance with the predetermined image to produce a latent image representing the predetermined image in the photothermographic material. The photosensitive layer contains an antihalation colorant in an amount greater than 0.02 percent by weight. The antihalation colorant is active to radiation in the first wavelength and is transparent to radiation at a second wavelength. The photothermographic material is heated to develop the latent image in the photothermographic material. The image reproducing material is imaged with radiation at the second wavelength using the photothermographic material as a mask.

Method and apparatus for producing image reproducing materials using

A silver halide photographic emulsion comprising a hydrophilic colloid binder, negative-acting silver halide grains, a hydrazine, and a contrast-promoting amount of a compound selected from the group consisting of 3-indazolinones, 4(3H)-pyrimidones, urazoles, 2-pyrazolin-5-ones, and 3-pyrazolin-5-ones.

Contrast-promoting agents in graphic arts media

A photothermographic element containing a transparent substrate having one major surface thereof containing the following layers sequentially coated thereon: an image-receiving layer; an opacifying layer; a first dry silver layer; an interlayer containing thermoplastic polymer; a second dry silver layer; an interlayer containing thermoplastic polymer; and a third dry silver layer, wherein the first, second, and third dry silver layers each contain a light-insensitive, reducible silver source; light-sensitive silver halide, and as a reducing agent for the light-insensitive, reducible silver source, a material oxidizable to a colored dye whose color differs from that capable of being formed in each other dry silver layer, each of the dry silver layers being individually sensitized to light of different wavelengths.

Photothermographic elements with novel layer structures, each of which

A photothermographic composite structure for use in a solvent-free dye thermal positive imaging diffusion-transfer process comprising:

Positive imaging diffusion-transfer dry silver system using formazan dye

Various photothermographic elements are provided containing a transparent substrate; image receiving layers; dry silver layers; interlayers; and a translucent or opacifying layer. The translucent or opacifying layer can occupy a variety of positions in the photothermographic element relative to the dry silver layers. The translucent or opacifying layers serve to help produce a reflection print upon exposure of the photothermographic element to actinic light and subsequent heating of the exposed element for image development and dye transfer.

Growing community of inventors

Stillwater, MN, United States of America

Richard C Cotner