Eastman-kodak Company

JoAnn D Hanna

Mark Edward Irving

Nancy B Liebert

Gregg P Bryant

David Howard Levy

Mark R Mis

Donald L Black

Sharon R Lunt

Stephen C Stoker

Stephen Swingley

The invention is directed to a color photothermographic film in which particles comprising an organic silver salt is treated with a dye that functions as a passivating agent. In particular, the present invention involves passivating the organic silver salts with a dye that blocks the surface of the organic silver salt or ligand, resulting in a reduction of speed loss. The invention is also directed to a method of making a photothermographic element to improve raw stock keeping.

Method of passivating a silver donor with a dye and photothermographic systems made thereby

The present invention is directed to a photothermographic element comprising silver halide, a blocked developer, a coupler, and core/shell particles, each such particle comprising a mixture of at least two non-photosensitive organic silver salts, which particle comprises a center portion comprising a non-photosensitive first organic silver salt and at least one shell portion covering the center portion, the shell comprising a non-photosensitive second organic silver salt. The organic silver salt in the shell has a higher pKsp relative to the organic silver salt in the core. This invention also provides a composition comprising core/shell non-photosensitive organic silver salt particles, and a method of making the particles.

Core/shell silver donors for photothermographic systems comprising an oxidatively less reactive shell

The invention is directed to a color photothermographic film in which particles comprising an organic silver salt is treated with a passivating agent. In particular, the present invention involves passivating the organic silver salts with an organic adsorbate that blocks the surface of the organic silver salt or ligand, resulting in a reduction of speed loss. The invention is also directed to a method of making a photothermographic element to improve raw stock keeping.

Method of passivating silver donors in photothermographic systems and imaging elements made thereby

A photographically useful high bromide tabular grain silver halide emulsion is disclosed in which iodide is incorporated in a tabular grain central region to lower contrast and in a peripheral region zone to increase photoefficiency. A further increase in photoefficiency is provided by an annular spacer region interposed between the central region and peripheral region zone having a lower iodide content than either.

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Rochester, NY, United States of America

JoAnn D Hanna