Surface conditioning and subbing of oriented linear polyester photographic film support

Claim 1

IN A PROCESS FOR PREPARING A FILM ADAPTED FOR PHOTOGRAPHIC UTILITY WHEREIN THE FILM SUPPORT IS AN ORIENTED AND HEAT SET HIGHLY POLYMERIC LINEAR POLYESTER OF A BIFUNCTIONAL AROMATIC DICARBOSYLIC ACID CONDENSED WITH A DIHYDROXY ORGANIC COMPOUND, THE STEPS COMPRISING (1) CONDITIONING THE SURFACE OF THE ORIENTED AND HEAT SET FILM FOR FROM ABOUT 1 SECOND TO ABOUT 5 MINUTES AT FROM ABOUT 50* F. TO ABOUT 175* F. BY CONTACT WITH AN AQUEOUS OXIDIZING SOLUTION SELECTED FROM THE GROUP CONSISTING OF (1) A SOLUTION OF FROM ABOUT 1% UP TO ABOUT 10% BY WEIGHT OF AN INORGANIC SALT WHICH IS AN OXIDIZING AGENT DISSOLVED IN WATER CONTAINING UP TO ABOUT 5% BY WEIGHT OF AN ALKALINE INORGANIC COMPOUND, AND (2) A SOLUTION OF FROM ABOUT 15% UP TO ABOUT 95% BY WEIGHT OF AN INORGANIC OXIDIZING ACID DISSOLVED IN WATER, AND (II) COATING THE CONDITIONED SURFACE WITH AN ADHERENT COPOLYMER OF AT LEAST 35% BY WEIGHT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE, AND FROM ABOUT 0.5 TO 25% OF AN EHTYLENICALLY UNSATUREATED MONOMERIC COPOLYMERIZABLE CARBOXYLIC ACIDIC COMPOUND, WHEREIN SAID CARBOXYLIC ACIDIC COMPOUND IS SELECTED FROM THE GROUP CONSISITNG OF ITACONIC ACID, CITRACONIC ACID, MESACONIC ACID, ACRYLIC ACID, A-METHACRYLIC ACID, MALEIC ACID, FUMARIC ACID AND THE ANHYDRIDES AND LOWER ALKYL HALF ESTERS OF THOSE ACIDS WHICH ARE DIBASIC.