Polycarbonate-based oriented film and retardation film

G - Physics – 02 – B

Patent

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G02B 5/30 (2006.01) C08G 64/06 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2459177

A film constituted of a specified polycarbonate of 165.ordm.C or higher glass transition temperature having a fluorene ring, which film is a uniaxial or biaxial alignment film exhibiting a heat shrinkage factor, after heat treatment at 90.ordm.C for 500 hr, of 0.1% or below and a ratio of film in- plane phase difference R (550) at a wavelength of 550 nm to film in-plane phase difference R (450) at a wavelength of 450 nm of 1 to 1.06. This film can be used in a high-grade liquid crystal display unit of, for example, vertical alignment system, and is useful as a phase difference film that has substantially solved the picture-frame problem.

L'invention concerne un film constitué d'un polycarbonate spécifié d'une température de transition vitreuse d'au moins 165 ·C ayant un anneau de fluorène. Ce film est un film à alignement uniaxial ou biaxial présentant, suite à un traitement thermique à 90 ·C pendant 500 heures, un facteur de rétrécissement thermique de 0,1 % au maximum et un rapport entre une différence de phases du film dans le plan R (550) à une longueur d'onde de 550 nm et une différence de phases du film dans le plan R (450) à une longueur d'onde de 450 nm, allant de 1 à 1,06. On peut utiliser ce film dans une unité d'affichage à cristaux liquides à teneur élevée, par exemple, un système d'alignement vertical et comme un film à différence de phases qui a pratiquement résolu le problème de la trame d'image.

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