公开(公告)号：US20190302317A1

公开(公告)日：2019-10-03

申请号：US16307875

申请日：2017-06-05

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Todd D. Jones ,  Bimal V. Thakkar ,  Duane D. Fansler ,  Anthony F. Schultz ,  Jonathan E. Janoski ,  David C. Lueneburg ,  Carla S. Thomas ,  Tien Yi T.H. Whiting ,  Robert F. Watkins

IPC: G02B1/14 ,  G02B5/124 ,  G02B5/128 ,  C08L33/06 ,  C08L29/14 ,  B29D11/00

Abstract: A light directing article comprises an acrylic polyvinyl acetal film to protect the optical elements of the light directing article. The acrylic polyvinyl acetal film has a Tg of at least 30° C. and comprises a (meth)acrylic polymer and polyvinyl acetal polymer. The acrylic polyvinyl acetal film is flexible and durable to mechanical deformation.