Moisture-resistant, coated thermoplastic film having enhanced adhesion to inks and metallic layers
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Nov 3, 1987
filing date -
Nov 3, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A two-step, sequential coating method is disclosed which permits the use of aqueous precursor solutions to coat water-insoluble compounds onto thermoplastic film. In a preferred embodiment, an aqueous oleic acid/ammonium oleate solution is coated onto amorphous polyester sheet which is subsequently monoaxially oriented by stretching in the machine direction, and coated with an aqueous solution of calcium hydroxide, thereby forming a layer of calcium oleate in situ. The coated film is subsequently biaxially oriented by stretching in the transverse direction, and heat-set.
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