Minnesota Mining and Manufacturing Company

Duncan M Grieve

Stephen S Poon

Sharon Mary Simpson

Kumars Sakizadeh

Doreen Catherine Lynch

Andrew W Mott

Justine A Mooney

David C Weigel

Tran V Thien

Robert J Nairne

John H Stibbard

David C Bays

Kim Marie Vogel

Kevin D Landgrebe

Roger A Mader

Gilbert L Eian

Raymond J Kenney

Takuzo Ishida

Ronald W Burrows

John Souter

William E Bottomley

A thermographic element comprising in a non-aqueous binder medium a silver salt oxidizing agent in reactive association with a compound comprising a plurality of redox color releasing moieties such that oxidation of each redox color releasing moiety causes release from said compound of a thermally diffusible dye. The compounds many of which are new incorporate two or more developer moieties into a single molecule to minimize the diffusibility of the compound. Following oxidation, either directly by the silver salt or by means of a cross-oxidizing agent, each oxidized developer moiety releases a thermally diffusible dye. The compounds are of sufficient size and molecular weight to slow or prevent diffusion in imaging systems and yet possess several active developer moieties per molecule which is advantageous over known ballasted dye releasers which comprise bulky molecules with only a single developer moiety.

Developing agents for (photo) thermographic systems

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

Hydrazide redox-dye-releasing compounds for photothermographic elements

Presensitized sheets for color proofing comprising a removable carrier sheet bearing a photosensitive medium sensitive to radiation within the wavelength band 325 to 700 nm and comprising photohardenable, photoadherent, photoinsolubilisable or photosolubilisable material, the sheet including a removable antihalation layer which is removed either when stripping the carrier sheet or during subsequent processing. The antihalation dyes may be positioned within a transparent carrier sheet, in a layer on the carrier sheet opposite to the photosensitive medium or in a layer positioned between the carrier sheet and light-sensitive medium.

Pre-press light-sensitive color proofing article incorporating

Color photothermographic elements

A photothermographic element comprising a support bearing a photothermographic medium, the medium comprising a light sensitive silver halide in reactive association with a silver salt of an organic acid and a color generating reducing agent which is a leuco compound which is oxidisable by silver ions into a colored dye of the general formula: ##STR1## in which: n=0, 1 or 2,

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Saffron Walden, United Kingdom

Duncan M Grieve