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Method for making multilayer optical films having thin optical layers

  • US 5,976,424 A
  • Filed: 07/31/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 07/31/1996
  • Status: Expired due to Term
First Claim
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1. A method for making a multilayer optical film, comprising the steps of:

  • providing a first and second resin;

    extruding the first and second resins into a resin stream comprising a plurality of layers and having first and second major surfaces, wherein at least some of the plurality of layers comprise the first resin and at least some of the plurality of layers comprise the second resin, wherein the number of layers having a layer thickness of less than k microns and disposed within 400 microns of the first surface is greater than the number of layers having a layer thickness of less than k microns and disposed within 400 microns of the second surface, and wherein k≦

    10; and

    casting the resin stream against a casting surface such that the first major surface is in contact with the casting surface.

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