Minnesota Mining and Manufacturing Company

Imation Corporation

Massimo Bertoldi

Roberto Sardelli

Ivano Delprato

Cristina Soncini

Sergio Massirio

Vinicio Busatto

Enzo Coraluppi

Anna Maria Canuti

Kumars Sakizadeh

Mark P Kirk

Marco Bucci

John R Boon

Stefano Mana

Giovanni Giusto

Emilio Prosperi

Ferdinando Orengo

Antonio Poggi

Sahron M Simpson

Anna Marie Canuti

A multilayer silver halide color photographic element comprises a support having coated thereon a silver antihalation layer, an interlayer, at least two red-sensitive silver halide emulsion layers, at least two green-sensitive silver halide emulsion layers a yellow filter layer, and at least two blue-sensitive silver halide emulsion layers, wherein the interlayer provided between the silver antihalation layer and the red-sensitive silver halide emulsion layer closest to the support contains a bleach accelerator releasing compound, and the silver antihalation layer contains a water-soluble organic thiol. The invention provides reduction in residual silver levels and backside turbidity after processing, without deleteriously affecting sensitometric properties of the photographic element.

Silver halide color photographic element having improved bleachability

Silver halide photographic element comprising a support having coated thereon red-, green- and blue-sensitive silver halide emulsion layers comprising, respectively, cyan, magenta and yellow dye-forming couplers, wherein at least one silver halide emulsion layer comprises a yellow dye-forming DIR coupler having a 1,2,4-triazolyl group attached to the coupling position, said 1,2,4-triazolyl group comprising a hydrolyzable alkoxy- or aryloxy-carbonyl group attached to a benzylthio substituent on the 1,2,4-triazolyl group. Preferably, the yellow dye-forming DIR coupler is represented by the formula ##STR1## wherein R.sub.1 represents an alkyl group, an aryl group or --NHR.sub.5, wherein R.sub.5 represents an alkyl group or an aryl group,

Silver halide color photographic light-sensitive elements having

A process for preparation of 4-mercapto-1-naphthol compounds which comprises the steps of:

Process for preparation of 4-mercapto-1-naphthol compounds

The addition of 3-substituted-5-mercapto-1H-tetrazoles to silver halide photothermographic emulsions improves the post-processing stability of the emulsion.

Post processing stabilization of photothermographic emulsions

The present invention relates to a light-sensitive silver halide photographic material comprising a support and silver halide emulsion layer or layers, wherein at least one of said silver halide emulsion layers comprises an alkylaminomercaptotetrazole antifoggant. According to a preferred embodiment of the present invention said silver halide emulsion layer comprises tabular silver halide grains having an average aspect ratio higher than 3:1 and a thickness lower than 0.4 .mu.m.

Silver halide photographic material comprising mercaptotetrazole

Silver halide photographic element comprising a support and at least one silver halide emulsion layer having therein a 2-equivalent 5-pyrazolone magenta coupler represented by the formula: ##STR1## wherein a represents an integer from 0 to 3,

Silver halide photographic elements containing 2-equivalent 5-pyrazolone

Multilayer silver halide color photographic element comprising a support having thereon at least a blue sensitive silver halide emulsion layer containing a yellow dye-forming coupler, at least a green-sensitive silver halide emulsion layer containing a magenta dye-forming coupler, and at least a red-sensitive silver halide emulsion layer containing a cyan dye-forming coupler, said red-sensitive layer or a gelatin interlayer adjacent said red-sensitive layer containing a non-diffusible, non-coupling magenta colored azo dye.

Silver halide color photographic elements

Multilayer silver halide color photographic element comprising a support having thereon at least a blue sensitive silver halide emulsion layer containing a yellow dye-forming coupler, at least a green-sensitive silver halide emulsion layer containing a magenta dye-forming coupler, and at least a red-sensitive silver halide emulsion layer containing a cyan dye-forming coupler, said red-sensitive layer containing a non-diffusible, cyan dye-forming magenta masking coupler.

Silver halide color photographic light-sensitive material which comprises a support having thereon at least one silver halide emulsion layer containing a) an alkoxybenzoylacetanilide DIR coupler having bonded to the coupling active position a group which provides a compound having a development inhibiting property when the group is released from the coupler active position upon the color development reaction, wherein said group is a 4,7-dihalogen-2-benzotriazolyl group and b) an alkoxybenzoylacetanilide yellow dye forming coupler having a 3-hydantoinyl leaving group bonded to the coupling active position to provide, upon exposure and development, color images of improved image sensitivity.

Silver halide color photographic light-sensitive material

Silver halide photographic element comprising a support and at least one silver halide emulsion layer, characterised in that said silver halide emulsion layer is spectrally sensitized to infrared radiation with a tricarbocyanine dye having the formula: ##STR1## wherein, Z.sub.1 and Z.sub.2 each independently represents the atoms necessary to complete a thiazole nucleus or an oxazole nucleus, Z.sub.3 represents the atoms necessary to complete a 5-membered N-containing aromatic ring, Q represents the atoms necessary to complete a 5- or 6-membered carbocyclic ring, R.sub.1 and R.sub.2 each independently represents an alkyl group, X.sup.- represents an anion, and n represents an integer of 1 to 2, provided that n is 1 when the dye forms an intramolecular salt.

Photographic silver halide elements comprising infrared sensitizing dyes

Silver halide color photographic light-sensitive material which comprises a support having thereon at least one silver halide emulsion layer containing a) a diacylaminomethylene yellow dye forming coupler having bonded to the coupling active position a group which provides a compound having a development inhibiting property when the group is released from the coupler active position upon the color development reaction, wherein said group is a 4,7-dihalogen-2-benzotriazolyl group and b) an alkoxybenzoyl acetanilide yellow dye forming coupler having a 3-hydantoinyl leaving group bonded to the coupling active position.

The addition of certain 5-mercapto-1,2,4-triazoles to silver halide photothermographic emulsions improves the post-processing image stability of those emulsions.

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Fossano, Italy

Massimo Bertoldi