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MULTILAYER OPTICAL FILM, METHOD OF MAKING THE SAME, AND TRANSACTION CARD HAVING THE SAME

  • US 20070298271A1
  • Filed: 06/15/2007
  • Published: 12/27/2007
  • Est. Priority Date: 06/23/2006
  • Status: Abandoned Application
First Claim
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1. A multilayer optical film comprising:

  • 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.

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