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Wide band semi-specular mirror film incorporating nanovoided polymeric layer

  • US 9,995,861 B2
  • Filed: 10/14/2011
  • Issued: 06/12/2018
  • Est. Priority Date: 10/20/2010
  • Status: Active Grant
First Claim
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1. A reflective film, comprising:

  • a multilayer optical film having a first major surface and a second major surface, wherein the multilayer optical film includes a plurality of microlayers configured to provide a broad reflection band that shifts as a function of incidence angle, the multilayer optical film having a long wavelength band edge disposed at a wavelength no greater than 1600 nm for normally incident light; and

    a diffusing layer in contact with the first major surface, the diffusing layer adapted to scatter visible light into the multilayer optical film over a range of angles such that the scattered light can be substantially reflected by the broad reflection band;

    wherein the diffusing layer comprises a polymer binder having a nanovoided morphology comprising a plurality of interconnected voids or a network of voids dispersed in the polymer binder; and

    wherein the reflective film has a total hemispheric reflectivity for visible light of at least 97% when the second major surface of the multilayer optical film is in contact with an absorbing material.

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