| 摘要 |
PURPOSE:To produce a heat-resistant moistureproof vapor deposition film excellent in heat resistance and moisture proof by vapor depositing a metal on a biaxially oriented polypropylene film having specified thermal fusing temp. and crystallization degree to obtain specified thermal shrinkage and permeability for water vapor. CONSTITUTION:At least one surface of a biaxially oriented polypropylene film having >=165 deg.C peak temp. of thermal fusing temp. and >=50% crystallization degree is treated with corona discharge or plasma to deposit a metal (such as Al, Zn, Si) by vapor deposition. Thus, a film having <6 % total thermal shrinkage in the longitudinal direction and lateral direction when heated at 140 deg.C for 15min. and having <=1.0g/m<2>.24hr/20mum permeability of water vapor is obtd. The film has excellent heat resistance and moisture proof and good dimensional stability. |
