Eastman-kodak Company

Kenneth G Harbison

Edgar E Riecke

Derek D Chapman

Hwei-Ling Yau

Terrence Robert O'Toole

Daniel L Kapp

Donald P Specht

Frank A Pettrone

Wilbur S Gaugh

Chung Y Chen

Kenneth Don Fowler

Donna L Tomko

Thomas Henry Whitesides

Charles Leo Bauer

James A Friday

Janglin Chen

Jon N Eikenberry

John D Mee

Walter Bolger

Amine modified gelatin layer for improved adhesion of photographic elements after annealing

This invention relates to a method of reducing fog in a silver halide emulsion comprising taking a high fogging emulsion which has been chemically sensitized and cooled, holding the high fogging emulsion in the form of a melt in preparation for coating on a support, and prior to or during said holding, contacting the emulsion with an isothiazolin-one compound represented by the following formula

Method of suppressing fog in silver halide emulsions

This invention relates to a method of preventing fog formation in a silver halide photographic element, said method comprising bringing a silver halide developer solution, or a solution preceding a silver halide developer solution, into contact with a cyanide scavenger by a method other than the seasoning out of the cyanide scavenger from a sensitized silver halide photographic element.

Method of processing a silver halide photographic element which reduces

A photographic element and an aqueous coating composition for providing a layer to a photographic element are disclosed. The coating composition comprises gelatin in a concentration greater than about 6% by weight, and a palladium complex having the structure: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, and R.sup.8 are independently selected from hydrogen, alkyl, alkenyl, aryl or alkaryl, the alkyl, alkenyl, aryl, or alkaryl optionally being substituted with a hydroxy, sulfonate, amino or ammonium group; and wherein any two of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, and R.sup.8 can be bonded to form a ring; Z.sup.1 and Z.sup.2 independently represent the number of carbon atoms necessary to form a 5 or 6 membered ring, inclusive of palladium, wherein the carbon atoms may be substituted with hydrogen, sulfonate, alkyl, alkenyl, aryl or alkaryl, the alkyl, alkenyl, aryl, or alkaryl optionally being substituted with a hydroxy, halogen, sulfonate, amino or ammonium group; and n is -2 to 4.

Photographic element and coating composition

Novel compounds represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.2 represent hydrogen or alkyl, R.sub.3 represents hydrogen, alkyl, substituted alkyl or CONR.sub.1 R.sub.2, and n is 0 to 6, can be used to harden gelatin. The compounds are particularly useful for hardening gelatin of a photographic element.

Carbamyl-substituted bis(vinylsulfonyl) methane hardeners

Hydrophilic organic colloids such as collagen or gelatin are modified for use in photographic elements such as film or paper, or for use as reagents in automated dry chemical analyzers. The modification comprises reaction of some of the carboxy groups attached to the polypeptide with (i) a amide bond forming agent, e.g. 1-pyrrolidinylcarbonylpyridinium chloride, and (ii) a di- or triamine, such as piperazine, diethylenetriamine or ethylenediamine. Such modification enables that colloid to react faster with a gelatin hardener such as bis(vinylsulfonyl)methane (BVSM). When coated over an equal amount of unmodified gelatin, and both layers imbibed with BVSM, a modified gelatin layer showed an enzyme resistance greater than that of the unmodified gelatin. This demonstrates that the modified gelatin hardened preferentially. This discovery of a method for differential hardening can be utilized to prepare multilayer photographic elements or multilayer reagents for chemical analyzers that contain one or more layers which are hardened preferentially, i.e. to a greater degree than other layers.

Modification of gelatin

A method for hardening gelatin which comprises using as a hardening agent a compound represented by formula (I): ##STR1## wherein R.sub.1, when taken along, may be alkyl of 1 to 20 carbon atoms, aralkyl of from 7 to 20 carbon atoms, aryl of from 6 to 20 carbon atoms, and alkenyl of from 2 to 20 carbon atoms. R.sub.1 and R.sub.2 can also combine with each other to form a heterocyclic ring of 5 to 8 atoms. The R.sub.1 -R.sub.2 ring contains the nitrogen atoms to which R.sub.1 and R.sub.2 are attached, and may also contain an additional nitrogen atom. R.sub.2 and R.sub.3 can combine to form either a 5 or 6 membered ring. The R.sub.2 -R.sub.3 ring contains the nitrogen atom to which R.sub.2 is attached, and may also contain one or two additional nitrogen atoms. R.sub.4 may be hydrogen or alkyl of 1 to 4 carbon atoms. R.sub.5 may be hydrogen or one or more substituents at any of positions 3 through 6 on the pyridine ring, including alkyl of 1 to 20 carbon atoms, aryl of from 6 to 20 carbon atoms, aralkyl of from 7 to 20 carbon atoms, or alkenyl of from 2 to 20 carbon atoms, alkoxy of 1 to 20 carbon atoms, aryloxy of from 6 to 20 carbon atoms, carboxy, halogen, nitro, or sulfo. R.sub.5 may be in a fused ring structure such as in quinoline. X.sup.- represents an anion or an anionic portion of compounds of formula (I) effectively harden gelatin with little or no afterhardening. These compounds are useful in hardening gelatin in photographic elements.

Method and composition for hardening gelatin

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

A silver halide emulsion contained in a photographic element is protected against hydrogen cyanide gas, which may evolve from carbon black contained in a non-light sensitive material associated with the photographic element, by a scavenger for hydrogen cyanide gas in a location where it will intercept the hydrogen cyanide gas.

Photographic material protected against hydrogen cyanide gas

A method for hardening gelatin comprising combining the gelatin to be hardened with a compound of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, and X.sup..THETA. are as herein defined. The compounds of this formula effectively harden gelatin with little or no after-hardening. These compounds are useful in hardening gelatin in photographic elements.

An improved photographic support, especially useful for color prints, is comprised of a paper base material having thereon a polyolefin coating containing a white pigment and a mixture of optical brighteners, such mixture comprising certain fluorescent bis(benzoxazolyl)stilbenes. The support exhibits improved brightness at low brightener concentration and unexpected resistance to brightener exudation.

Growing community of inventors

Rochester, NY, United States of America

Kenneth G Harbison