Primer coated amorphous plastic films

A method for improving slip characteristics of a polymeric film when contacted with other polymeric films and improving ink adhesion to the surface of the polymeric film comprising the steps of:

• a) applying to a surface of a substantially amorphous polymeric film a sufficient amount of a primer coating to improve adhesion of inks to the surface of the film and reduce a coefficient of friction as compared to a film without the primer coating thereon, wherein the primer coating comprises (i) 95 to 100 weight percent copolyester having repeat units from a dicarboxylic acid component comprising 8 to 25 mole percent 5-sulfoisophthalic acid and 75 to 92 mole percent isophthalic acid and repeat units from a diol component comprising 25 to 100 mole percent diethylene glycol, 0 to 75 mole percent 1,4-cyclohexane-dimethanol, and 0 to 30 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid component and 100 mole percent diol component, and (ii) 0 to 5 weight percent wax, and the film comprises a copolyester having repeat units from a dicarboxylic acid component comprising at least 75 mole percent terephthalic acid or naphthalene dicarboxylic acid and repeat units from a diol component comprising 0.5 to 65 mole percent 1,4-cyclohexanedimethanol and 35 to 99.5 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid component and 100 mole percent diol component;
• b) drying the primer coating;
• and
• c) printing ink on the primer coated surface of the film.