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US 11,397,286 B2Granted
Acrylic polyvinyl acetal film for a light directing article
Assignee3M Innovative Properties Company
InventorsTodd 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
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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.
Claims19
A light directing article comprising:
- a body layer having a Tg of at least 30° C. but no greater than 60° C. comprising a (meth)acrylic polymer and polyvinyl acetal polymer comprising polymerized units having the following formula
- wherein R1 is hydrogen or a C1-C7 alkyl group;
- and
- a second layer proximate the body layer, wherein the second layer comprises optical elements.
1 more element
Dependencies are inferred from the claim text.