In situ modification of gelatin carboxyl groups

摘要

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.