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Post-formable multilayer optical films and methods of forming

  • US 9,588,270 B2
  • Filed: 01/06/2012
  • Issued: 03/07/2017
  • Est. Priority Date: 01/13/1998
  • Status: Expired due to Fees
First Claim
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1. An article comprising a multilayer optical film comprising an optical stack comprising a plurality of layers, the layers comprising at least one birefringent polymer and at least one different polymer, wherein the optical stack comprises a strain-induced index of refraction differential along a first in-plane axis and substantially the entire optical stack reflects at least about 85% of light of desired wavelengths that is polarized along the first in-plane axis, and further wherein the thickness of the optical stack varies by at least about 10% or more;

  • and wherein the birefringent polymer is a polyester.

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