Minnesota Mining and Manufacturing Company

Imation Corporation

Tran V Thien

William Donald Ramsden

Ranjan C Patel

Stephen S Poon

Gregory D Cuny

Kumars Sakizadeh

Stanley C Busman

David C Weigel

Richard J Ellis

Duncan M Grieve

Jeanne E Haubrich

Doreen Catherine Lynch

Roger A Mader

Takuzo Ishida

Randall H Helland

Kenneth L Hanzalik

Lori S Harring

David Warner

Charles W Gomez

Steven Swain

Photochemical acid progenitors in combination with dihydroperimidine squarylium dyes have been found to be particularly effective at generating acid upon irradiation with near-infrared radiation. It has been found that dihydroperimidine squarylium dyes that are particularly useful in this invention have an oxidation potential greater than about 0.5 V relative to SCE as measured in dichloromethane.

Compositions and processes for photogeneration of acid

Composition comprising photochemical acid progenitor and specific

Heat-developable photothermographic materials capable of providing stable color images of high resolution. These materials comprise a support bearing a layer of an image-forming composition comprising:

Ballasted leuco dyes and photothermographic element containing same

Dihydroperimidine squarylium dyes have been found to be particularly effective when used in acutance and antihalation systems for photothermographic and photographic articles.

Dihydroperimidine squarylium dyes as antihalation and acutance materials

A method of forming an image in which a color donor element and a receiving element are placed in face-to-face contact and opposed imagewise to infrared radiation, e.g. by laser exposure, in which at least one of the donor and receptor elements comprises a near-infrared absorbing dye which is a squarilium dye having dihydroperimidine terminal groups.

Thermal dye transfer

A dye-transfer-sheet in the form of a self supporting film having a total thickness of from 4 to 15 .mu.m and consisting of a layer of one or more thermally mobile sublimation dyes dissolved or dispersed in a polymeric binder and a hydrophilic barrier layer adjacent to, but distinct from the dye-containing layer comprising a polymeric binder substantially impermeable to migration of the sublimable dye(s). The dye-transfer-sheets have a high sensitivity due to the absence of a separate support substrate and are capable of producing clear, high density transferred images.

Dye transfer media

Compounds having a utility as photosensitive dyes in photocurable polymer based imaging systems having a nucleus of general formula (I): ##STR1## wherein: n is 1 or 2,

Preparation and use of dyes

A photothermographic element comprising a support bearing an image forming system comprising:

Photothermographic elements

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,

Azine redox dyes and their corresponding dyes of the formula: ##STR1## in which: X is O, S, NR.sup.2,

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Harlow, United Kingdom

Tran V Thien