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Multilayer polymer film with additional coatings or layers

  • US 6,368,699 B1
  • Filed: 08/13/1997
  • Issued: 04/09/2002
  • Est. Priority Date: 06/26/1995
  • Status: Expired due to Term
First Claim
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1. A multilayer film including an optical stack comprising layers of a semi-crystalline polymer having an average thickness of not more than 0.5 microns and layers of a second polymer having an average thickness of not more than 0.5 microns wherein said optical stack has been stretched in at least one direction to at least twice that direction'"'"'s unstretched dimension, said optical stack having first and second major surfaces, each of said layers having indices of refraction nx and ny in a plane of said layer and nz normal to a plane of said layer all of said indices of refraction being selected to provide desired optical properties, said film further comprising a first additional layer adhered to said first major surface, said additional layer being of a material selected for its mechanical properties, said mechanical properties differing from mechanical properties of said layers of said optical stack.

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