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Polarizable amines and polyimides for optical alignment of liquid crystals

  • US 6,084,057 A
  • Filed: 05/20/1997
  • Issued: 07/04/2000
  • Est. Priority Date: 05/20/1997
  • Status: Expired due to Fees
First Claim
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1. A polyamic acid comprising the reaction product of an amine component and at least one tetracarboxylic dianhydride, wherein the amine component comprises a polarizable diamine and the polyamic acid is characterized by the formula ##STR21## wherein A is a trivalent organic moiety, Lf is a divalent organic radical comprising at least four fluorinated carbon atoms;

  • P is a polar group comprising a Pi electron system containing at least one heteroatom selected from the group N, O and S; and

    M is a tetravalent organic radical containing at least two carbon atoms, with no more than two carbonyl groups being attached to any one carbon atom of the tetravalent radical.

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