公开(公告)号：US20200217989A1

公开(公告)日：2020-07-09

申请号：US16823158

申请日：2020-03-18

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Chad R. Wold ,  Yufeng Liu ,  Timothy J. Hebrink ,  Stephen A. Johnosn ,  Diane North ,  Laurent Froissard ,  Edward J. Kivel

IPC: G02B1/10 ,  B42D25/445 ,  B42D25/36 ,  B29C48/08 ,  B29C48/00 ,  B29C48/21 ,  B29C48/18 ,  B32B27/08 ,  B32B27/36 ,  B32B27/30 ,  B42D25/00 ,  B32B7/12 ,  B42D25/23 ,  B42D25/29 ,  B42D25/351 ,  B42D25/425 ,  B42D25/455 ,  B29C35/02 ,  B29C55/00 ,  B29C55/12 ,  B29D11/00 ,  G02B1/04 ,  G02B5/02 ,  G02B5/08 ,  G02B5/30

Abstract: A multilayer optical film includes alternating layers of first and second optical layers; the first optical layer comprising a first polyester, wherein the first polyester comprises first dicarboxylate monomers and first diol monomers, and from about 0.25 to less than 10 mol % of the first dicarboxylate monomers have pendant ionic groups; the second optical layer comprising a second polyester; and wherein the first and second optical layers have refractive indices along at least one axis that differ by at least 0.04. The multilayer optical film may be a polarizer film, a reflective polarizer film, a diffuse blend reflective polarizer film, a diffuser film, a brightness enhancing film, a turning film, a mirror film, or a combination thereof. The multilayer optical film may also be a transaction card such as a financial transaction card, an identification card, a key card, or a ticket card. A method of making the multilayer film is also disclosed.