New constructions of multilayer optical films, laminates thereof, and cards incorporating same are disclosed. In a card, the multilayer optical film can be sandwiched between relatively thick polymer layers using adhesive layers that are at least 0.5 mils thick but that may collectively account for no...http://www.google.co.uk/patents/US20050259326?utm_source=gb-gplus-sharePatent US20050259326 - Cards and laminates incorporating multilayer optical films
