Process for producing photographic materials

Abstract

An improved process for producing a photographic material in which an assembly of superposed liquid photographic layers is coated onto the surface of a moving base support in such a way that the properties of the liquid photographic layers being coated are evaluated by their dynamic surface tensions.

What is claimed is: 
     
       1. In a process for producing a photographic material by coating an assembly of superposed liquid photographic layers onto the surface of a moving base support, the improvement wherein said assembly comprises at least three superposed liquid photographic layers in which the dynamic surface tension is substantially inverted in a certain intermediate layer of the assembly,   a peak dynamic surface tension occurs in said certain intermediate layer with the difference between said peak and the dynamic surface tension of any adjacent layer being at least 3 dynes/cm; and   the topmost layer of said assembly is formed of a coating solution that has a lower dynamic surface tension than the coating solutions for any other layers of the assembly by at least 5 dynes/cm.   
     
     
       2. The process according to claim 1 wherein said liquid layers are formed of a gelatin solution. 
     
     
       3. The process according to claim 1 wherein said dynamic surface tensions are adjusted with an anionic or nonionic surfactant. 
     
     
       4. The process according to claim 1 which is implemented by a sliding hopper coating method. 
     
     
       5. The process according to claim 1 wherein said photographic material is a color photographic material.