Post-stretch water-dispersible subbing composition for polyester film base

Claim 1

An article of manufacture comprising an energy-treated biaxially oriented polyester film base coated with (1) a subbing layer applied from an aqueous dispersion of a linear copolyester having a relative viscosity of from about 1.3 to about 1.7 measured as a 0.58% solution in m-cresol at 25° C. which comprises the reaction product of substantially equimolar equivalents of at least two dicarboxylic acids and at least one dihydric alcohol, said dicarboxylic acid equivalents being supplied by a plurality of acid reactants which, based on a total of 100% (molar) acid equivalents, includes from about 0.1% (molar) to about 10% (molar) equivalents of an aromatic sulfonated compound having a structural formula, ##STR3## wherein: M is a monovalent cation selected from the group of an alkali metal, ammonium substituted ammonium, and quaternary ammonium; X and Y are monovalent radicals individually selected from the group having structural formulas consisting of ##STR4## wherein A is a lower alkyl group having 1-5 carbon atoms; m and n are positive integers of less than 20 with n being greater than 1; and Z is a trivalent aromatic radical; and wherein said copolyester is not branched, cross-linked, or used with a crosslinking agent; and (2) a gelatin-containing layer contiguous thereto.