CO-EXTRUDED LAMINATED POLYESTER FILM

摘要

PROBLEM TO BE SOLVED: To provide an excellently transparent co-extruded polyester laminated film having a surface generating no interference fringe even in contact with another transparent member and another surface which is flat. SOLUTION: The co-extruded polyester laminated film comprises at least two polyester layers. One surface has not less than 0.7 (pieces/mm2) of a density of protrusion showing the interference fringes of 5 order or more observed by double beam interferometry, and another surface has a surface roughness Ra of not more than 0.4μm. COPYRIGHT: (C)2006,JPO&NCIPI