A moistureproof film composed of a transparent multi-layer film having a layer structure that thin metal or nonmetal oxide layers (C) are respectively arranged directly or through an adhesive layer (B) on both sides of a hygroscopic resin layer (A), and having a water vapor transmission rate of at most...http://www.google.fr/patents/US6432516?utm_source=gb-gplus-shareBrevet US6432516 - Moistureproofing film and electroluminescent device
Moistureproofing film and electroluminescent device
