In situ modification of gelatin carboxyl groups

Details In situ modification of gelatin carboxyl groups In situ modification of gelatin carboxyl groups

C - Chemistry, Metallurgy

09

H

C09H 7/00 (2006.01) C08H 1/00 (2006.01) C08H 1/06 (2006.01) G03C 1/047 (2006.01) G03C 5/315 (2006.01)

Patent

CA 2099422

26 TITLE IN SITU MODIFICATION OF GELATIN CARBOXYL GROUPS ABSTRACT OF THE INVENTION A modified gelatin and its use in a photographic element are described whereby the pendant carboxyl groups of polypeptide chains are modified. 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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