| abstract |
ABSTRACT OF THE DISCLOSURE A coated, oriented plastic film material is provided wherein the coating is applied in an aqueous medium comprising a water dispersible copolyester consisting essentially of the condensation product of components A, B, C and D or their polyester forming equivalents as follows: A) about 65 to 95 mole percent of isophthalic acid; B) about 0 to 30 mole percent of at least one aliphatic dicarboxylic acid of the formula HOOC(CH2)nCOOH, wherein n ranges from about 1-11; C) about 5 to about 15 mole percent of at least one sulfomonomer containing an alkali metal sulfonate group attached to a dicarboxylic aromatic nucleus, and D) stoichiometric quantities of about 100 mole percent of at least one copolymerizable aliphatic or cycloaliphatic alkylene glycol having about from 2 to 11 carbon atoms. The copolyester coating layer may be applied to the film, e.g., polyester film, at any suitable stage during manufacture of the film, i.e., before, during, or after the stretching operations. The resultant coated polyester film is found to provide excellent adhesion to metallic coatings subsequently applied thereto by metallizing techniques. |