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Optical rotator formed of a twisted nematic liquid crystal polyster including an ortho-substituted aromatic unit

  • US 5,206,752 A
  • Filed: 05/20/1991
  • Issued: 04/27/1993
  • Est. Priority Date: 05/18/1990
  • Status: Expired due to Term
First Claim
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1. An optical rotator comprising a light transmitting base;

  • an alignment film layer formed on said base; and

    a film layer formed of a liquid crystalline polyester which includes an ortho-substituted aromatic unit which exhibits twisted nematic orientation in the state of liquid crystal and assumes a glassy state at a temperature below the liquid crystal transition point of the polyester.

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