E.i. Dupont De Nemours and Company

Sterling Diagnostic Imaging, Inc.

Sterling Diagnsotic Imaging, Inc.

Timothy D Weatherill

Rolf Thomas Weberg

Ludovic Fodor

Richard Roy Jones

Reinhold R Uger

Ludovic U Fodor

An improved method for increaseing the hardening in a photographic element is described. The hardener is an imidazolium compound of formula: ##STR1## and the imidazolium is used in conjunction with a hardening accelerator defined by: ##STR2## the substituents are listed in the specification.

Hardening of hydrophilic colloids

An improved method of hardening a hydrophilic colloid is detailed. The hardening results in a stronger matrix and less water pickup. These and other advantages are obtained by hardening with a combination of at least one hardener chosen from Formula I either alone or in combination with at least one hardener chosen from Formula II: ##STR1## The substituents are defined.

Hardening of hydrophilic colloids with imidazolium and triazine

This invention is related to improved hardeners for proteinaceous materials. More specifically this invention is related to improved imidazolium hardeners for crosslinking a proteinaceous material for use in a photographic film. The improved hardeners are defined by the formula: ##STR1##

Imidazolium hardeners for hydrophilic colloids

An improved hardener and a photographic element comprising same defined by ##STR1## wherein: the substituent groups are as defined in the specification.

Imidazolium hardeners

Hardeners for hydrophilic colloid defined by the formula: ##STR1## The hardeners are for crosslinking proteinaceous materials for use in photographic films.

Imidazolium hardeners for hydrophilic colloid

A photographic element comprising a modified gelatin whereby the modification results in carbamoyl groups by forming peptide bonds using fast-acting hardener. The derivatization involves initial reaction with a carboxyl activator followed by addition of a substituted amine thereby forming an amide linkage on the polypeptide chain. The resulting gelatin and photographic elements comprising such gelatin have a decreased propensity for water absorption without the loss of sensitometric properties.

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Hendersonville, NC, United States of America

Timothy D Weatherill