Methods and apparatuses are provided for the manufacture of coextruded polymeric multilayer optical films. The multilayer optical films have an ordered arrangement of layers of two or more materials having particular layer thicknesses and a prescribed layer thickness gradient throughout the multilayer...http://www.google.fr/patents/US20050175827?utm_source=gb-gplus-shareBrevet US20050175827 - Multilayer optical film with antistatic additive
