Moistureproof multilayered film
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United States of America Patent
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Jun 15, 2004
Grant Date -
N/A
app pub date -
Jul 16, 2003
filing date -
May 7, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A moistureproof multilayer film, including a composite film having a non-moisture absorbing resin layer and a vapor deposited film of an inorganic oxide or a metal formed on at least one side of the non-moisture absorbing resin layer, the multilayer film having such a layer structure where the vapor deposited film surface of the composite film is laminated through an adhesive layer on a vapor deposited film surface of another composite film or a surface of another non-moisture absorbing resin layer, wherein a total number (n) of the deposited films laminated adjacent to the adhesive layer is 2 to 8, and wherein a moisture permeabihty (W; unit: g/m.sup.2.day) as measured under conditions of a temperature of 40.degree. C. and a relative humidity of 100% satisfies a relation represented by equation W.ltoreq.(1/n).times.0.20, and a method for producing the moistureproof multilayer film including heat-treating the multilayer film in a hot dry atmosphere having a temperature lower than 140.degree. C. but not lower than 55.degree. C. for at least 10 hours.
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