Process for making multilayer optical films

Details Process for making multilayer optical films Process for making multilayer optical films

B - Operations, Transporting

29

C

B29C 47/70 (2006.01) B29C 47/92 (2006.01) B29C 59/02 (2006.01) B32B 27/32 (2006.01) B32B 31/22 (1995.01) B32B 31/30 (1995.01)

Patent

CA 2316974

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 optical stack. The methods and apparatuses described allow improved control over individual layer thicknesses, layer thickness gradients, indices of refraction, interlayer adhesion, and surface characteristics of the optical films. The methods and apparatuses described are useful for making interference polarizers, mirrors, and colored films that are optically effective over divers portions of the ultraviolet, visible, and infrared spectra.

L'invention concerne des procédés et appareils permettant de fabriquer des films optiques multicouches polymères obtenus par coextrusion. Les films optiques multicouches comprennent une disposition ordonnée de couches constituées d'au moins deux matières ayant des épaisseurs distinctes et, sur toute la pile optique multicouche, un gradient d'épaisseur de couche établi. Les procédés et appareils selon l'invention permettent une maîtrise améliorée des différentes épaisseurs de couche, des gradients d'épaisseur de couche, des indices de réfraction, de l'adhérence intercouche, et des caractéristiques superficielles des films optiques. Les procédés et appareils selon l'invention servent à fabriquer des polariseurs à interférences, des miroirs, et des films colorés optiquement efficaces sur diverses portions des spectres ultraviolet, visible et infrarouge.

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