Laminates including photographic films comprising modified, superficially adhesive films of crystalline polymeric alpha-olefins, and methods for making such laminates

Claim 1

A PHOTOGRAPHIC FILM COMPRISING AT LEAST ONE GELATINSILVER HALIDE LAYER AND, AS A SUPPORT THEREFOR, A FILM OF HIGHLY CRYSTALLINE POLYPROPYLENE CONSISITNG PREVAILINGLY OF ISOTACTIC MACROMOLECULES, AND WHICH HAS BEEN RENDERED SUPERFICIALLY ADHESIVE BY TREATING A SURFACE THEREOF WITH A 2% TO 3% SOLUTION OF A MODIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF SULFURIC AND CHLOROSULFONIC ACID IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF CHLOROFORM, DICHLORETHYLENE AND TRICHLOROETHYLENE, FOR FROM ABOUT 0.5 SECOND TO 5 MINUTES, TO THEREBY INTRODUCE SULFONIC GROUPS INTO THE POLYPROPYLENE SUBSTANTIALLY EXCLUSIVELY AT THE SURFACE OF THE FILM, THE POLYPROPYLENE FILM BEING DISPOSED IN THE PHOTOGRAPHIC FILM WITH ITS SURFACE COMPRISING THE SULFONIC GROUPS CONTIGUOUS TO THE GELATINSILVER HALIDE LAYER.