3m Innovative Properties Company

Randall E Kozulla

Patrick J Hager

Joseph T Bartusiak

Scott D Pearson

Kevin M Hamer

Martin E Denker

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).

Growing community of inventors

Stillwater, MN, United States of America

Randall E Kozulla