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.es/patents/US6830713?utm_source=gb-gplus-sharePatente US6830713 - Method for making coPEN/PMMA multilayer optical films
Method for making coPEN/PMMA multilayer optical films
