B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 27/32 (2006.01) C09J 7/02 (2006.01)
Patent
CA 2399230
A multi-layered biaxially oriented film comprising at least one primary layer and at least one secondary layer, wherein the primary layer comprises a propylene copolymer having a first melting point and the secondary layer comprises a polypropylene homopolymer or copolymer having a second melting point, such that the second melting point is greater than the first melting point and the multi-layered construction is biaxially stretched. The multi-layered film further includes a surface finishing layer, to provide a writable multi-layered film. This stretched film exhibits a refractive index in the machine direction (MD) that is greater than the refractive index measured in the transverse direction (TD).
La présente invention concerne un film multicouche orienté de manière biaxiale, comprenant au moins une couche primaire et au moins une couche secondaire, la couche primaire comprenant un copolymère propylène ayant un premier point de fusion, et la couche secondaire comprenant un homopolymère ou copolymère polypropylène ayant un second point de fusion, de sorte que le second point de fusion est supérieur au premier point de fusion et que la structure multicouche se trouve étirée de manière biaxiale. Le film multicouche comprend également une couche de finition de surface permettant d'obtenir un film multicouche inscriptible. Le film étiré présente un indice de réfraction dans la direction machine (MD) qui est supérieur à l'indice de réfraction mesuré dans la direction transversale (TD).
Bartusiak Joseph T.
Denker Martin E.
Hager Patrick J.
Hamer Kevin M.
Kozulla Randall E.
3m Innovative Properties Company
Smart & Biggar
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