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Method and materials for preventing warping in optical films

  • US 6,673,425 B1
  • Filed: 10/27/2000
  • Issued: 01/06/2004
  • Est. Priority Date: 10/27/2000
  • Status: Active Grant
First Claim
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1. A multilayer optical body comprising:

  • an optical film;

    an extrudable thermoplastic polymeric layer secured to the optical film; and

    a flexible, dimensionally stable layer secured to the polymeric layer, wherein the dimensionally stable layer comprises polystyrene or a polystyrene copolymer and the dimensionally stable layer is configured and arranged to permit cycling the optical body through temperatures of −

    30°

    C. and 85°

    C. every 1.5 hours for 400 hours without warping.

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