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Optical film

  • US 20030138654A1
  • Filed: 10/17/2002
  • Published: 07/24/2003
  • Est. Priority Date: 04/25/2000
  • Status: Active Grant
First Claim
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1. A film which comprises a polymer having such a structure that the main chain thereof comprises a hydrocarbon skeleton and some of the hydrogen atoms of the hydrocarbon skeleton are substituted by at least one alicyclic group selected from the group consisting of an alicyclic hydrocarbon group having a 4 or more membered ring and an alicyclic heterocyclic group, the amount of the alicyclic group being 60 to 90 wt %, and which satisfies the following formula (A):

  • R(450)/R(550)<

    1 



    (A) wherein R(450) and R(550) are phase differences on the film plane at a wavelength of 450 nm and a wavelength of 550 nm, respectively.

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