Minnesota Mining and Manufacturing Company

Imation Corporation

Dian E Stevenson

Randall H Helland

Ranjan C Patel

Mark P Kirk

George V Tiers

Andrew W Mott

Jonathan P Kitchin

Kumars Sakizadeh

William Donald Ramsden

Roger A Mader

Terence D Spawn

Mark B Mizen

Richard A Newmark

Sylvia A Farnum

Mark R Chambers

Robert J Nairne

William C Frank

Gregory L Zwaldo

Mark R I Chambers

Robert J D Nairne

Kevin M Kidnie

Carlo Marchesano

Kevin P Hall

Julian M Wallis

John Souter

Elda Moizo

Jonathan C Vogel

Jonathan P, Kitchin

Stephen Newman

A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by laser irradiation, which is useful in the production of colored images.

Laser absorbable photobleachable compositions

A laser addressable thermal imaging element comprising a bleachable photothermal converting dye in association with a heat-sensitive imaging medium, and a photoreducing agent for said dye, said photoreducing agent bleaching said dye on laser address of the element. The imaging element may be in the form of a colorant transfer system, a peel-apart system, a phototackification system or a unimolecular thermal fragmentation system. Also provided is a method of crosslinking a resin by leaser irradiation, which is useful in the production of colored images.

A laser-induced thermal imaging system having a donor element and a receptor element. The donor element includes a substrate on which is coated transfer material that includes: a binder including a hydroxylic resin; a fluorocarbon additive; a cationic infrared absorbing dye; a dihydropyridine latent crosslinking agent; and a dispersible material. The receptor element comprises a texturized surface.

Laser induced film transfer system

An imaging method is provided that includes a tetraarylpolymethine dye, and bleaching this dye by bringing the dye into contact with a 4-alkyl or 4-unsubstituted 1,4-dihydropyridine derivative.

Thermal bleaching of infrared dyes

A black and white photographic element comprising as a photosensitive medium a layer of a silver halide emulsion characterised in that the photosensitive medium comprises in the same layer or in an adjacent layer thereto a developer comprising a substantially non-diffusing polymeric compound having as a component part of its structure a plurality of units having a nucleus of general formula (I): ##STR1## wherein; each Z independently is a member selected from the group consisting of --OH and a group which leaves an --OH residue when contacted with an alkali (pH .gtoreq.10) at temperatures of .ltoreq.50.degree. C.

Silver halide imaging materials

The present invention relates to a black-and-white aqueous alkaline photographic developer composition, free of dihydroxybenzene developing agent, comprising a reductic acid developing agent and an auxiliary superadditive developing agent, wherein the reductic acid developing agent is represented by the formula (I): ##STR1## wherein, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each are selected from the group consisting of hydrogen and group CH.sub.2 R.sub.5, wherein R.sub.5 is hydrogen or a monovalent group, e.g. amino, cyano, halogen, hydroxyl, carboxyl, sulfonyl, alkyl, cycloalkyl, aryl. A process for forming a black-and-white photographic silver image comprising developing a silver halide photographic element with said black-and-white aqueous alkaline photographic developer composition is also described.

Photographic silver halide developer composition and process for forming

A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: ##STR1## wherein: each of R.sup.a and R.sup.b are individually selected from: hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both R.sup.a and R.sup.b represent hydrogen;

Quaternary-ammonium phenylsulfonylacetate thermal-dye-bleach agents

Tetra-alkylammonium phenylsulfonylacetate thermal-dye-bleach agents

A thermal-dye-bleach construction comprising a polymethine dye having a nucleus of general formula I: ##STR1## in association with a thermal-carbanion-generating agent having the general formula: ##STR2## wherein the substituents are as defined in the specification and claims.

Thermal-dye-bleach construction comprising a polymethine dye and a

A photographic element containing a thermal-dye-bleach construction includes a thermal nucleophile-generating agent in association with a polymethine dye having a nucleus of general formula (I): ##STR1##

Photographic element containing a thermal dye bleach system

A thermal-dye-bleach construction comprising a thermal nucleophile-generating agent in association with a styryl dye having a nucleus of general formula (I): ##STR1## representing the nucleus of a styryl dye in which R=methyl or ethyl group

Thermal dye bleach construction sensitive to ultraviolet radiation

A thermal-dye-bleach construction comprising a thermal nucleophile-generating agent in association with a polymethine dye having a nucleus of general formula (I): ##STR1## in which: n is 0, 1, 2 or 3;

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Saffron Walden, United Kingdom

Dian E Stevenson