Heat-resistant moistureproof film

Abstract

A heat-resistant moistureproof film having a first layer (A), a second layer (B) bonded to one side of the first layer, and a third layer (C) bonded to the other side of the first layer. The first layer (A) is a single or a laminate of a transparent laminated film having a base film composed of PVA having a saponification degree of not less than 99 mol % and a transparent silicon oxide thin film (SO thin film) 2 formed on at least one side thereof. The second layer (B) is a single or a laminate of a transparent plastic film other than a PVA film, having at least one layer of the plastic film with a transparent SO thin film 4 having a thickness of 100 to 5000 .ANG. formed on at least one side thereof, and at least one layer of a transparent heat-resistant film having the sum of the absolute values of the percentages of heat-shrinkage in the machine direction and transverse direction when heated at 150.degree. C. for 30 minutes, of not more than 1% and a light transmittance of not less than 85% by ASTM D-1003. The the third layer (C) is a heat-sealable resin layer.

Dependencies are inferred from the claim text.