Eastman-kodak Company

John D Mee

Steven G Link

Colin J Gray

Derek D Chapman

Hwei-Ling Yau

Donald R Diehl

Richard L Parton

Margaret Jones Helber

Anthony Adin

Myra T Olm

Kevin W Williams

Wolfgang H Gunther

David A Stegman

Stephen A Hershey

Kenneth G Harbison

Anthony D Gingello

John M Higgins

John P Freeman

Thomas R Dobles

Richard E Beal

Heidi E Dankosh

Julia Pich

Jal F Munshi

Fred M Macon

Walter Bolger

High bromide cubic grain emulsions

This invention comprises a photographic element comprising a light sensitive silver halide emulsion layer which contains a sensitizing dye of the formula:

Photographic element

A photographic element having a light sensitive layer and containing a dye of the formula (I): ##STR1## wherein: X.sub.1 and X.sub.2 each independently represents the atoms necessary to complete a 5- or 6-membered heterocyclic nucleus;

Infrared absorber dyes

A dye of the formula (I) below, and photographic elements having a light sensitive layer and which element contains such a dye: ##STR1## X.sub.1 and X.sub.2 each independently represent the atoms necessary to complete a 5- or 6-membered heterocyclic nucleus;

Cyanine dyes with chain sulfone substituent photographic materials

A method of synthesizing a compound having a 1,3-thiazolidin-4-one ring appended at the 2-position by a double bond to the active methylene position of a ketomethylene or malononitrile moiety, which comprises reacting the corresponding ketomethylene compound or malononitrile with an isothiocyanate in the presence of a base, reacting the resulting product with a haloacetic acid or haloacetic ester, followed by eliminating water or alcohol to form the 1,3-thiazolidin-4-one ring. A fragment necessary to complete a merocyanine, oxonol, hemicyanine, benzylidene, cinnamylidene or holopolar cyanine dye can be appended to the 1,3-thiazolidin-4-one ring to obtain the desired dye.

Method of synthesizing dyes and precursor compounds therefor

A photographic element comprising a light sensitive silver halide emulsion sensitized with a dye of formula (I) and a nucleating agent or amine booster associated with the silver halide emulsion: ##STR1## wherein: R.sub.3 is an alkyl group, alkenyl group, or aryl group

Photographic elements with tetra-nuclear merocyanine sensitizers

A photographic element having a silver halide emulsion sensitized by dye of the formula I: ##STR1## wherein: R.sup.1 represents a substituted or unsubstituted aromatic or heteroaromatic group, a substituted or unsubstituted alkyl or H; R.sup.2 represents a substituted or unsubstituted alkyl, alkenyl, aryl, aralkyl, or H; E.sup.1 represents an electron withdrawing group; Z represents the non-metallic atoms required to complete a substituted or unsubstituted ring system containing at least one 5- or 6-membered heterocyclic nucleus; L.sup.1, L.sup.2, L.sup.5 and L.sup.6 independently represent a substituted or unsubstituted methine; m may be 0, 1, 2 or 3; n may be 0 or 1.

Photographic elements containing particular sensitizing dyes

Dyes according to formulas (I), (II), (III), (IV), and (V) below are described. The dyes are useful as low-staining sensitizing dyes for photographic materials. ##STR1## Z.sub.1, Z.sub.2, Z.sub.3, R.sub.1, R.sub.2, L, D, G, X, n, P, and q are defined herein.

Sensitizing dyes for photographic materials

A photosensitive photographic material is described comprising a support bearing a silver halide emulsion layer sensitized with a dye of the general formula: ##STR1## wherein Y is S or Se,

Silver halide photographic material

Compounds of the formulaa: ##STR1## where Z.sub.1, Z.sub.2, L.sub.1 -L.sub.5, R.sub.1, R.sub.2, R.sub.3, m, and n are as defined herein are disclosed. A method of making the componds is also disclosed. the compounds are useful as sensitizing dyes in photographic elements.

Tri-nuclear dyes for photographic compositions and method of prepartion

Radiation sensitive silver halide photographic elements are disclosed which are protected from fog by hydrolyzed quaternized chalcogenazolium salts of middle chalcogens, wherein the quaternizing substituent contains a ##STR1## group in which T and T.sup.1 are carbonyl or sulfonyl and m is from 1 to 3.

Hydrolyzed azolium speed enhancing/fog-inhibiting agents for silver

Polymethine dyes are disclosed containing a tellurazolium nucleus which is substituted at its 2-position with methine chain which is in turn substituted at its .beta. position with a dye property modifier. These dyes can be used in photographic elements to facilitate image formation.

Photographically useful chalcogenazolium polymethine dyes

Nondiffusive compounds comprised of a sensitizing dye moiety and an

Radiation-cleavable nondiffusible compounds for providing a transfer dye image are comprised of a spectral sensitizing dye moiety and a diffusible image dye moiety joined to a linkage in the spectral sensitizing dye moiety which is cleaved upon absorption of radiation by the spectal sensitizing dye moiety, thereby releasing the diffusible dye. Such compounds are useful in radiation-sensitive elements and processes.

Radiation-cleavable nondiffusible compounds and photographic elements

Novel methyne dyes comprising two auxochromic groups of the type used in a cyanine or merocyanine dye linked by a carbon atom chain wherein each of the carbon atoms have an unsaturated linkage to at least one adjacent carbon atom in the chain and at least one pair of carbon atoms in the chain being joined by a triple bond or, in an alternate resonance form, the chain including three consecutive carbon to carbon double bonds. The dyes are useful as spectral sensitizing dyes for silver halide emulsions and as intermediates for synthesizing chain-substituted methine dyes.

Growing community of inventors

Rochester, NY, United States of America

John D Mee