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Process for making an optical compensator film comprising an anisotropic nematic liquid crystal

  • US 6,894,751 B2
  • Filed: 07/12/2002
  • Issued: 05/17/2005
  • Est. Priority Date: 07/12/2002
  • Status: Active Grant
First Claim
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1. A process for making an optical compensator, comprising the steps of:

  • a) applying a liquid comprising a nematic liquid-crystal compound in a solvent carrier onto the orientation layer on a transparent support to form a liquid-crystal-containing coating;

    b) drying the liquid-crystal-containing coating, thereby forming a liquid-crystal-containing layer;

    c) optionally heating the liquid-crystal-containing layer to a temperature that is above 50°

    C.;

    d) cooling the liquid-crystal-containing layer to near or below its isotropic nematic phase transition temperature Tc for at least 5 seconds to form a positively birefringent nematic phase, thereby forming an anisotropic nematic liquid-crystalline layer;

    e) polymerizing and/or curing the anisotropic nematic liquid-crystalline layer with radiation at a temperature below the Tc of the anisotropic nematic liquid-crystalline layer to form an integral component.

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